Phil and I have just been out on to a private road to measure our 0-60 times, and on the way it blinkin started raining!!
However after a few blasts the best time Phil got was 8.73s and best time I got was 7.43s (I had a few more goes than phil as the computer didnt seem to like him).
On my first go I got 8.9s and managed to fishtail it all over the road,ooops s:) :) s:) Phil said it looked dangerous but was lauging at the time. I'm alive and managed to get it back in a straight line.
We were launching from a layby onto the main road so there will be some error in the actual 0-60 times as we're going round a bend.
Good fun, nice to see what its like in the dry or if can find somewhere to launch without it
1)being wet.
2)having a bend before the run.
3)using something better than a odb2 reader to measure 0-60 times.
7.4s is pretty impressive given the run conditions! The uni-chip and exhaust have clearly made a significant difference.
yeah, very impressive considering that you were on a bend!!
but i can understand the fish tailing it happened to me again today s:shock: :shock: s:shock: keeps you awake
It goes to show how much respect you have to give these cars. Alex had actually straightened up when his rear wheels started trying to get in front of the headlights! And give him his dues Alex got back to straight pretty quickly and made 60mph in 8.9 on that run.
Personally I blame the extra weight in the car, I'm 4.5 stone heavier than him! I just need to do some post-xmas exercise and I'll be down to fighting weight.
Another couple of runs with the laptop working and I reckon I could have reduced it to below the quoted stock time.
Phil
was thinking earlier with this 0-60 timing in the wet!
i cannot think of a time when the car has ever felt unstable or lack of grip in the wet on a straight even since turbo!
im fairly confident even in the turbo that i could get a respectable time not far off its performance when in the dry and i think your results back that up?!
like ive mentioned before the only time this car ie evil is when your just come off a bend on to straight stretch of road, thats when you get the surprise!! s:shock: :shock: s:shock:
Quote from: "bossman23780"was thinking earlier with this 0-60 timing in the wet!
i cannot think of a time when the car has ever felt unstable or lack of grip in the wet on a straight even since turbo!
I'm fairly confident even in the turbo that i could get a respectable time not far off its performance when in the dry and i think your results back that up?!
like ive mentioned before the only time this car ie evil is when your just come off a bend on to straight stretch of road, thats when you get the surprise!! s:shock: :shock: s:shock:
Yeah when i did the good 0-60 times i didnt feel any loss in grip, i think i could maybe shave a fraction of a second off the time if i was driving straight and not on a turn from the parking position. I did loose grip at one point when i fishtailed but having looked back at the point it happend there is a bit of a hole in the road which may mean i lost grip on one tyre for a bit..
i think the only way in which you would get bad times is if there was alot of standing water, then causing aquaplaning s:shock: :shock: s:shock: which is really easy to do in our car, maybe thats what happened with you then, that hole could have caused that effect on the tire?!
aquaplaning... ouch... yeah it could have been that.... phil's bigger wheels saved him s:) :) s:)
I should imagine you can get off the mark a lot quicker in the dry.
not unless your a silky smooth ace formula one driver wannabe such as myself?! s:wink: :wink: s:wink: s:lol: :lol: s:lol:
no im just saying you could get close
i have a mate with a rover 220 tomcat (non turbo) which has been tweeked.i think he is pushing out 160 - 170 bhp.
he wants to see how evenly matched they are, and has invited me up to the local airfield to test the theory out.
i am going to wait till i have my manifold on before i try this, and i want some dry weather.
i think power to weight ratio i will have him, but i think he has more tourque, so should be interesting.
Quote from: "rtbiscuit"i am going to wait till i have my manifold on before i try this, and i want some dry weather.
and a turbo s:twisted: :twisted: s:twisted:
then you'd have no probs beating him s:) :) s:)
SPEND
SPEND SPEND
stop it you bad man!
this is a positive forum where we're meant to lead a good example to the young noobs, and your advotacting large expenditure!
bad bad man! s:wink: :wink: s:wink:
Had a footle with Mike's accelero-gizmo a while ago. We were two-up and hard-topped and it was leathering it down. Just couldn't get the power down even with the extra ballast!
Any of you guys who can get close in the wet to what you'd get in the dry - I doff my cap to you.
Just a quessie - can you guys get to 60 in 2nd? The J-spec has you well into 3rd before 60 hits.
i'm pretty sure i can hit 60 in 2nd
I thought so .... in which case my time wasn't too bad i spose. Love to try again on warm dry tarmac though s:wink: :wink: s:wink:
yeah easy to 60 and a bit more in second gear is that because its a six speed then?
yeah i can hit 60 before the revlimter..
*(bad pun time: J-spec ratios aren't geared up for 0-60 times)*
Quote from: "spit"*(bad pun time: J-spec ratios aren't geared up for 0-60 times)*
BUGGER! s:twisted: :twisted: s:twisted:
I think 60 is pretty much red-line in second. My speedo seriously lies, with my stock rims/tyres. When my speedo said 60, my sat nav said 55. I put my money on the GPS being accurate and it seems to be correct. Speed cameras and cop cars seems to agree with the GPS anyway s:D :D s:D
Anyone else recorded differences between gps and speedo readings? Are the times recorded using the speedo or gps?
I know the manufacturing tollerances allowed on speedos in the UK is +/- 10%. I've been in two Vectra's which read spot on but other than that I find that almost all other cars I've been in read between 5 and 10% slow.
times used speedo.. so there could be some error again..although we used the ecu reading which may or may not be same as dial is showing..
what is the most accurate way of reading 0-60?! i would like to test mine one day but only if im going to get a true result
Maybe we should arrange a get-together with Firepower Phil - he has a very sexy accelerometer gizmo that can do 0-60. You can also set it for for 50-70 and others etc etc.
Can't remember what the kit is though s:oops: :oops: s:oops:
Quote from: "bossman23780"what is the most accurate way of reading 0-60?! i would like to test mine one day but only if I'm going to get a true result
Has to be gps.. assuming that it updates quick enough.. you can buy 0-60 reading gizmos..
GPS, providing you have some software to do it
Quote from: "spit"Maybe we should arrange a get-together with Firepower Phil - he has a very sexy accelerometer gizmo that can do 0-60. You can also set it for for 50-70 and others etc etc.
Can't remember what the kit is though s:oops: :oops: s:oops:
Defo!!
whats firepower think?!
Quote from: "kanujunkie"GPS, providing you have some software to do it
so that sound exspensive?!
Quote from: "spit"Maybe we should arrange a get-together with Firepower Phil - he has a very sexy accelerometer gizmo that can do 0-60. You can also set it for for 50-70 and others etc etc.
Sounds like a great idea, anyone fancy running with this?!
It would be good to link 0-60 times with dyno plots and mod lists etc. Obviously there is the question of different drivers abilities, tyres etc but I think the data would be interesting and useful
i am searching on the web and not comming up with much regarding gps 0-60 measuring thingies ..
thingies? is that a technical term? s:lol: :lol: s:lol:
no.. but whadmacallits are s:) :) s:)
we could chip in and get this? s:) :) s:)
m http://cgi.ebay.co.uk/Bosch-Rolling-Roa ... dZViewItem (http://cgi.ebay.co.uk/Bosch-Rolling-Road-Chassis-Dynomometer-Dyno_W0QQitemZ180069748666QQihZ008QQcategoryZ30928QQrdZ1QQcmdZViewItem) m
s:roll: :roll: s:roll: s:roll: :roll: s:roll: s:roll: :roll: s:roll:
all sat nav devices have it, tomtoms, road angels etc. The speed refresh rates on these will vary though.
I have a bluetooth GPS reciever for my phone, and run TomTom Navigator 6 on it.
A bluetooth GPS reciever is about £25 these days I think.
There's probably software for windows mobile or symbian that will do 0-60 times too. (:Me goes and investigates)
who's house we keeping it at then?! s:lol: :lol: s:lol:
only real way to get higher refresh rates is to buy aeronautical gps or go and raid your local MOD base
tom tom etc does 0-60 times?
no
didnt think so
Quote from: "kanujunkie"only real way to get higher refresh rates is to buy aeronautical gps or go and raid your local MOD base
well my car is stealth black!
i should think it would be easy to sneak in and get away with turbo power! s:wink: :wink: s:wink:
Here's a high-end all-in kit. (http://www.roadtune.co.uk/dynostar.shtml) £250 + VAT
Wonder if you can get software for Windows Pocket PC to go with a satnav GPS receiver? If anyone finds something, let me know s:wink: :wink: s:wink:
yeah ste i found that.. (ouchy price)
mrdyno in the states is 130 dollars but its an accelatometer so if you move up or down a hill it doesnt read that correctly.
i never finished trying this out
m http://www.trackthisout.com/ (http://www.trackthisout.com/) m
this is about a hundred quid m http://www.gtechpro.com/ (http://www.gtechpro.com/) m and can do shift lights directly from the cig lighter.. somehow
hm, can't find any software. As I'm a programmer in my day job I think I'll just write a crude little program to do it myself. At least I'll know it's as accurate as possible s:) :) s:)
Will be willing to share it with anyone else interested.
Quote from: "northernalex"tom tom etc does 0-60 times?
it doesn't but it prints you present speed, so think of it as a more accurate speedo. The downside is that it shows your average speed over a segment of time, and the speed displayed doesn't update every frame (it would be more unfriendly if it did).
I will write some software for use on Windows Mobile devices, I'll only spend a day on it so it won't be mind blowing, but it will do the job.
dan.. that sounds cool mate! what a star s:) :) s:) ( just need a windows mobile device now)..
Quote from: "muffdan"hm, can't find any software. As I'm a programmer in my day job I think I'll just write a crude little program to do it myself. At least I'll know it's as accurate as possible s:) :) s:)
Will be willing to share it with anyone else interested.
will it work on PPC?, if so then yes please s:D :D s:D
Sounds good.
I found this (http://www.download.com/GPSAuto/3004-2153_4-10592983.html?tag=tab_scr) - just a basic speedo I think .... but its free, works on PPC / Windows Mobile and may give you some pointers?
yep, any device that can run pocket pc software. I have an O2 XDA IIs as my mobile phone, it will also run on the newer O2 XDAs or Orange Smart Phones. I think TMobile have a suite of handsets that run Windows Mobile now too. Of course there's the whole PDA market too, iPaqs etc are all compatible.
I will create a new topic once it's done. Might get around to it this week or maybe next weekend. I feel quite motivated at the moment but may feel differently in the morning. I have a long list of these little side project apps I want to write but can never be that bothered to!
i should be able to work out the equations to change from speed, distance and time to bhp... (if you have the car mass, and wheel diameter) although my maths may be an over simplification.
you're right, it would need to know gear ratios and when you change gear alo but it could create a torque/bhp curve. Simplifying it you could just run the car in 3rd/4th from 1500 rpm up to 7k. Wind resistance will have a big effect on the results though (that's a set of maths I don't want to get into, any volunteers?)
Having said that, it could be simulated easily by adding a multiplier to the torque based on speed. This multiplier/speed mapping could be generated by using the results from a car run on a dyno, and comparing to the results from the GPS software. This of course would only give accurate mapping for wind resistance for MR2s.
It could also automatically start the timing when you pull, removing the need for you to simultaneously hit the "start timer" button whist you're trying to get that perfect start! There are issues there too; I don't know how much fluctuation on your position you will get from the GPS device while you're standing still, I'd be very surprised if it reads perfectly stationary.
im just going to use my fingers and count !!!!
i used to do that with my mums old metro,
it was so slow that i needed to take my shoes and socks off to be able to count its 0-60!
Traction wise, I found the '2 to get a bit fiesty on a handling day down one of the straights in the wet. Cosistently getting snaked around by the diff at around 50 mph in second gear. Only had it happen once on the road though, standing water, so was expecting it.
Chris
My laptop can measure it along with the odbc bluetooth port I have purchased (or with a pocket pc).
this looks ok
m http://www.youpriceit.co.uk/pages/store ... item_name= (http://www.youpriceit.co.uk/pages/store_item_detail.asp?item_id=260&item_name=) m <a%20href=pages/store_item_detail.asp?item_id=260&item_name=Auto_Meter_D-Pic_Performance_Gauge_4380_Black>Auto%20Meter%20D-Pic%20Performance%20Gauge%204380%20Black</a>
I have a gtech as well from that link s:) :) s:)
I brought this, after borrowing Tommy's once.
m http://www.car-pal.net/ (http://www.car-pal.net/) m
car pal looks good and is definatly smaller than by odb2 connection thingy, great for storing information from the ecu, but I'm not that sure of the 0-60 time accuracy of the odb2
What do/did you think of the g-tech?
vulture more, wanna sell, mode ended s:) :) s:)
I time mine using a friend and a stopwatch.
Calibrate the speedo using a GPS (Hold the GPS speed at a dead 60mph for a few seconds and read off the corresponding speedo reading - 64.5mph on mine)
Then floor it from standing while timing with a stopwatch to the "calibrated 60mph
OK - Can never be 100% accurate but gives a bullpark.
I can get 7.3sec but I'm lousy at launching which is where most of a good 0-60 run is at (driver, not car)
Quote from: "northernalex"but I'm not that sure of the 0-60 time accuracy of the odb2
Why ?
is there not 4 pulses per revolution of the wheel ? so you will be stopped at 0secs. Time is a constant so thats not a problem. by the end of 60mph i imagine the speed measurement will be very accurate.
Quote from: "northernalex"What do/did you think of the g-tech?
Hardly used to be honest, I brought it when I had the tubby, I tried a few times to have a play with it but it tends to move too easily rendering the tests invalid/inacurate.
regarding 4 pulses per rev.. i didnt know that.. I was assuming the 10% error in the speedo is similar at the odb2 (ecu). I'm not sure about this.
If this is the case then the 0-60 time i measured with phil is reasonably accurate.
Quote from: "northernalex"regarding 4 pulses per rev.. i didnt know that.. I was assuming the 10% error in the speedo is similar at the odb2 (ecu). I'm not sure about this.
If this is the case then the 0-60 time i measured with phil is reasonably accurate.
Given that is the case I believe my failing on our timings could well have been lifting off the gas pedal too soon. like when it hit 60 on the speedo.
Therefore, if I keep my foot down thru 60 the obd2 will read it more accurately than speedo and I should be able to shave something decent off my time.
Alex, what you doing sunday? all we need is a straight, dry road s:twisted: :twisted: s:twisted:
Phil
Quote from: "spit"Here's a high-end all-in kit. (http://www.roadtune.co.uk/dynostar.shtml) £250 + VAT
Wonder if you can get software for Windows Pocket PC to go with a satnav GPS receiver? If anyone finds something, let me know s:wink: :wink: s:wink:
Something like this? (http://www.morerevs.com/index.html)
Quote from: "Moleshome"Something like this? (http://www.morerevs.com/index.html)
Ooooo, cracking find! s:P :P s:P
Quote from: "spit"Quote from: "Moleshome"Something like this? (http://www.morerevs.com/index.html)
Ooooo, cracking find! s:P :P s:P
ditto, hats off to that man!
Excellent s:D :D s:D s:D :D s:D !!!
- I would plug it into my PDA & have a go with the demo version now but I don't have a PC to run a .exe file s:cry: :cry: s:cry:
I'm struggling with the zips within zips within zips concept, but I'll get my IT technician onto it .....
*shouts ....... Nic!*
If anyone finds that when they run the .exe file it produces some .cab files can someone please let me know/email me them so I can put them onto my PDA via my mac.
Some fellow geek might know what I'm talking about. s:D :D s:D
What would be realy interesting is comparitive times with and without hardtop.
I wonder if you loose in weight what you gain in aerodynamics,
Aw, it won't run on my ancient iPaq 39xx because I'm still running PocketPC 2002 s:( :( s:(
Did anyone go to the purchase (http://www.morerevs.com/purchase.html) page? Club discount of 10 copies with updates for £79.99.
Still fighting with the demo install to see if it works. TomTom on the phone can be temperamental - I expect this to be the same s:? :? s:?
going to try the demo at lunch time, but if it works im in on the group buy that would be cool, when i first read your post i thought it was 80 each not 80 for all 10 thats a bargain!! s:lol: :lol: s:lol:
just finished a beta version of my GPS speedo app, all I got to do is create a friendly installer for it and also compile it for Windows Mobile 2002 so people with older devices can run it.
There are accuracy issues. Although the speed read from the gps device is highly accurate, the rate at which you get this data is not often (just under a second). Because of this, I've added maths that will detect when you are over 60mph, and make an educated guess at when in the last second you actually hit 60.
Anyone interested in beta testing this for me, send me a PM with email address and I'll send you the software some time today. I'd also be interested in feedback on additional features or adjustments and bugs of course.
It's very straight forward to use. You have to select a comm port to use from the 8 available but of course it has to be the right one. Anyone with tomtom installed wil know what their comm port is. My XDA IIs uses comm 6.
HAve you got the programme as just a .cab file or equiv so I can install it direct from my ppc (don't have a windoze pc you see).
If so I'll give it a whirl on my axim x51 win 5.0.
Beta version of GPS speedo, it works!!! Excellent. I am in awe of you programmey people. Nicely done.
My times were crap, but thats me (wet), Manchester rain (the wettest), pulling out from a layby and 2 gearshifts s:cry: :cry: s:cry:
Get those excuses in early s:lol: :lol: s:lol: 6.314 secs
Ties in nicely with the times me and Mike got under similar drowned rat conditions using his accelero-do-dah which IIRC was 6.64, or 6.46?
cool, I was getting around 6.3 in the dry earlier. I don't have a dyno read out for my car though so I don't know if the time is accurate or not. Any volunteers who have stock cars to try it? We can compare to stock 0-60 times then. BTW, anyone tried a 0-100 yet? Not on a public road of course s:) :) s:)
6.3 in the dry?!
were you trying to as fast as possible?
yeah, I was pretty much nailing it. My speedo was reading 90 odd before the GPS read 60. The speed of the GPS is only updated once a second (regardless of baud rate), the speed is an averaged over I don't know how long. I think these parameters will vary between GPS devices too. So in order to hit the 60mph 'stop timer' trigger you have to average 60 over a second (or whatever the averaging duration is).
My next task is to ignore the speed calculated and reported by the GPS device and do the maths myself from the latitude and longitude. I can remove the averaging that is happening which will bring the times down.
Nice work Dan,
Just tried out my Muff'ometer (all praise to dan)
1st two runs I got 7.6 seconds - dry, clutch drop from 3k with not the greatest starts and abit of back end wobble.
These seemed pretty accurate - I also timed with a chrono stop watch using my speedo to a calibrated 60mph and got 7.8sec.
My final run - 6.7 sec. Seems very quick to me but it was a good getaway with minimal wheel spin and no wobble.
SUGGESTIONS:
1/ The speed readout and running timer - it would be better if these were in a big bold font so you can easily read them.
2/ How about standing 1/4miles, presumably that would be possible.
3/ A permenantly stored log of say your last 10runs and your best so far.
4/ What would be ultimate would be a graph of speed against time - that way you could see if you made a bum gear change or bad start etc etc - although I appreciate this could be tricky to programme (not that I know)
thanks for the work
s:D :D s:D
BTW I had to pretty much hit the limiter in second to get it to register a time.
IIRC 2nd gear tops out not much above 60 anyway.
just supprises me?!
the time you ran, i would expect abit lower than that especially if the tyres were warmed up, reason i say this is because TTET is 5.9?! but youve got the SP downpipe and the exhaust?!
so surely your can must be under achieving?! strange! now me thinks is your car set up on correct psi?!
Just had this image of dozens of roadsters across the country steaming down dualcarriagways and empty industrial estates and fiddling with PDA's.
s:D :D s:D
Quote from: "spit"Beta version of GPS speedo, it works!!! Excellent. I am in awe of you programmey people. Nicely done.
My times were crap, but thats me (wet), Manchester rain (the wettest), pulling out from a layby and 2 gearshifts s:cry: :cry: s:cry:
Get those excuses in early s:lol: :lol: s:lol: 6.314 secs
Ties in nicely with the times me and Mike got under similar drowned rat conditions using his accelero-do-dah which IIRC was 6.64, or 6.46?
if u want some one to hold it for u *ahem ooo-err missus, then gimme a shout. we could do my stock NA one too for comparison.
E
Quote from: "bossman23780"just supprises me?!
the time you ran, i would expect abit lower than that especially if the tyres were warmed up, reason i say this is because TTET is 5.9?! but youve got the SP downpipe and the exhaust?!
so surely your can must be under achieving?! strange! now me thinks is your car set up on correct psi?!
Yeah, if you were to ask me if the reading was slow, or the car was slow, I would hedge my bets on the reading being slow. My car feels sub 6 sec on the dash. Performing multiple runs will give better results, and I'm sure different GPS devices will calculate this speed differently (there is no standard way to calculate this, it is down to the hardware manufactures as far as I can tell).
I'm researching calculating accurate speeds from latitude/longitudes and it is a pretty complex business, prone to rounding errors (more errornous based on the car's heading) and the altidude of the car, so it might take me a while to get it working accurately. Once this is in the timings should be MUCH more accurate.
kool s8) 8) s8)
keep practising mate! s:lol: :lol: s:lol: s:wink: :wink: s:wink:
shame though that they never built an in car timer!
Quote from: "simonp"Nice work Dan,
SUGGESTIONS:
1/ The speed readout and running timer - it would be better if these were in a big bold font so you can easily read them.
2/ How about standing 1/4miles, presumably that would be possible.
3/ A permenantly stored log of say your last 10runs and your best so far.
4/ What would be ultimate would be a graph of speed against time - that way you could see if you made a bum gear change or bad start etc etc - although I appreciate this could be tricky to programme (not that I know)
s:D :D s:D
All sound good, thanks for the feedback. I'll change to a tabbed window system and add distance runs to one of the tabs. Graphs are more work but no problem to add. Ultimately I want to be creating torque.power plots too. I think I might have a product I could actually sell if it did that!
Nice one Dan - If those guys can market their product for £10 or whatever I'm sure you could!
We'll all expect it free of course! s:P :P s:P
Quote from: "muffdan"I would hedge my bets on the reading being slow.
You mean I could have done it even faster than 6.7 - Awesome! s:D :D s:D
I'm going to bed a happy man..
Quote from: "simonp"Nice one Dan - If those guys can market their product for £10 or whatever I'm sure you could!
We'll all expect it free of course! s:P :P s:P
FREE!! s:shock: :shock: s:shock:
FIRST DIBS ON IT s:twisted: :twisted: s:twisted:
youd make a fortune just on ebay!
Good work mate!!
My Boss's new car Cayman S has the sportspack which has a time on the dash to record time's which is way cool. I keep telling him his car is to slow that why I have to get the Stage II.
just been out and given it a test drive, i love my muffometer s:D :D s:D
(http://www.stuandele.co.uk/mr2roc/gpsspeedo.jpg)
only critisism i'd say i that the figures are too small to read and the reset buttons could also do with being a bit bigger, as for the times, well i'm thinking it could be a bit over optimistic, road was damp, i couldn't get good traction and the wheels were spinning a bit, other times i got varied but i saw a 5.25, a 6.4 and 7.2 plus a couple of other 6.somethings. The boost spiked at 7psi so still nowhere near top boost, the run in the photo had very minimul wheelspin though.
really simple to use software apart from that Dan, damn nice effort s:D :D s:D
thanks
already working on version 2; has bigger buttons, manual stop as well as manual start, large red bold font for the speed, saves comm/baud settings and whatever else I add tonight/tomorrow s:) :) s:)
Will try and improve accuracy too, but having worked on this project, GPS devices weren't designed to time 0..60 runs!
Accuracy is only an issue when comparing cars. Provided the inter run variability is minimal it would be a very useful tool for monitoring the effect of mods on a cars straight line performance.
I may try it with and without my unichip running for example.
Quote from: "muffdan"GPS devices weren't designed to time 0..60 runs!
its not the GPS system upstairs, thats damn quick, its the fact that were useing commercial grade GPS down here, its rubbish and doesn't update quick enough, IIRC every 1/10th sec approx or once very 760yrds approx at 60mph approx, not good s:( :( s:(
Quote from: "kanujunkie"Quote from: "muffdan"GPS devices weren't designed to time 0..60 runs!
its not the GPS system upstairs, thats damn quick, its the fact that were useing commercial grade GPS down here, its rubbish and doesn't update quick enough, IIRC every 1/10th sec approx or once very 760yrds approx at 60mph approx, not good s:( :( s:(
if you have all the data points for location vs time you can work out speed, acceration and 0-60 using a graphical program and a spline (easyplot for example). If the software could save a distancevs time .csv file it would be easy to mathematically work all this out.
Pain to program though??
s:shock: :shock: s:shock: what you say in english s:shock: :shock: s:shock:
the GPS devices we are using (they will vary) are only required to communicate at 4800 baud, although you can connect faster if the device supports it. Mine, succeeds at connecting at all baud rates, but the NMEA strings streamed over the comm still only seem to come in at 4800 s:( :( s:(
Other people with better (more expensive) receivers might get better results. The flashing '_' you see after the 'mph' is a sign that I have received new positional and speed data from the device. For me, at 4800 baud that is about once a second.
My plan is to use the positional data and to create an acceleration line at these known time intervals. I can then approximate when the car pulled off, and when the car hit 60, but the gear change we have to do just over 60 into 3rd is going to play a part, smoothing off the acceleration curve. Hopefully the accuracy then will be in the region of a few tenths. Performing multiple runs and using an average (which I'm also adding) should give a very good indication of actual performance.
I'll try implementing this over the weekend, testing is pretty tricky as I'm sure you can imagine and requires popping into the car every 15 minutes to do a few runs!
People look at me odd when I tear it out of a layby, fly past them and pull into the next layby half a mile up the road!
Quote from: "muffdan"People look at me odd when I tear it out of a layby, fly past them and pull into the next layby half a mile up the road!
Know what you mean ! I felt like a right ricer last night!
I've got the MkII TOMTOM Bluetooth receiver - I'll try upping the baud but I don't know how good it is.
Accurate or not 6.7 sec is now going to be my official quoted 0-60time! s:D :D s:D s:D :D s:D
i got the math wrong BTW, not 760yrds but 2.93yrds s:roll: :roll: s:roll: for got the mins to secs bit, been a long day s:? :? s:?
Quote from: "muffdan"Other people with better (more expensive) receivers might get better results. The flashing '_' you see after the 'mph' is a sign that I have received new positional and speed data from the device. For me, at 4800 baud that is about once a second.
It doesn't matter what Baud rate you use Dan, the best you'll get is once per second.
I've got some other GPS apps that I'm going to have a play with today to see whether the speed lag is down to the GPS.
Have you tried using GPVTG instead of GPRMC? I don't know whether that will make any difference.
NEW MR2 ROADSTER 0-60 RECORD TIME 3.2 SEC s8) 8) s8)
and all because i fitted the new flux capacitor,
new enlarged dolphin valves
and racing donkey flanges!
car goes like lightening now, beat you all! s:wink: :wink: s:wink:
and that definatley proves it, 3.2 out of a 1.8, me thinks not
that'll be caused by a temporary loss of signal, the timer starts when the average speed is greater than 0, but if it misses 1 or 2 position reads, then the timer starts much later, hence the very fast time. This will be much improved in version 2.
Quote from: "Moleshome"Have you tried using GPVTG instead of GPRMC? I don't know whether that will make any difference.
I believe the value is the same, just duplicated in a different NMEA sentence. I'm going to work off latitude and longitude, and calculate the speed and acceleration myself from this data. I should be able to use this to make a very good best guess at the actual moment you pull away and the moment you hit 60mph.
i'm sure its my racing donkey flanges, and sports dolphin valves,
they make a big difference!
Quote from: "muffdan"Quote from: "Moleshome"Have you tried using GPVTG instead of GPRMC? I don't know whether that will make any difference.
I believe the value is the same, just duplicated in a different NMEA sentence. I'm going to work off latitude and longitude, and calculate the speed and acceleration myself from this data. I should be able to use this to make a very good best guess at the actual moment you pull away and the moment you hit 60mph.
Looking at the output you're right the values are identical and start at the same time so no difference there, I also took a look at the SIRF binary protocol but that only outputs at 1Hz too so nothing to be gained there.
I had a play yesterday and the lag is huge, I've already hit 60 in 2nd gear but it's not until I'm well into 3rd gear that the GPS has decided I'm doing 60. I've got another PDA and some other GPSs, I'll try and have a go with those and see if there's any difference between devices.
Same conclusions I came to. It is documented that mid-range GPS receivers will update position and speed at 10Hz, and really expensive ones even higher. Once I am working purely off of UTC and latitude/longitude/altitude values the lag will be much less relevant, although for more accurate results accelerating hard right up to 70 (and maybe above s:) :) s:) ) is definitly required.
has any one comented on the racelogic drift box
isnt that what SP use's?! if its good enough for them why not our 2's?
Quote from: "bossman23780"has any one comented on the racelogic drift box
isnt that what SP use's?! if its good enough for them why not our 2's?
cos its expensive.
HA HA HA HA HA HA ..... HAHAHAHAHA
you must be joking!! s:wink: :wink: s:wink:
the amount of money ive and weve spent on our cars...
... well money lost all meaning!!
thats chump change! s:lol: :lol: s:lol: s:wink: :wink: s:wink:
Quote from: "bossman23780"HA HA HA HA HA HA ..... HAHAHAHAHA
you must be joking!! s:wink: :wink: s:wink:
the amount of money ive and weve spent on our cars...
... well money lost all meaning!!
thats chump change! s:lol: :lol: s:lol: s:wink: :wink: s:wink:
Get one then mate s:) :) s:) Its a fair wack for me compared to some free software and/or £10 for the commercial software.
Yeah this site makes the mr2 a money pit lol
how good is the performance box from racelogic then?
anything i would need to know?
Quote from: "bossman23780"how good is the performance box from racelogic then?
anything i would need to know?
FROM RACELOGIC WEBSITE
How Does DriftBox Work?
Housed inside the DriftBox is a high performance 10Hz GPS engine coupled with sophisticated motion sensors. Speed, Postion, Acceleration and Drift are measured 10 times a second. To measure Drift angle, the angle the vehicle is pointing is computed using the motion sensors, and this is compared with the angle the vehicle is travelling which is computed from the GPS.
DriftBox is equipped with an MMC/SD Flash memory card socket. This allows 10Hz logging of Time, Distance, Speed, Position, G-force, Lap Times, Split Times, and Drift Angle.
Data logged to the MMC flash card can be analysed in detail using the PC software provided. For convenience, the DriftBox can be connected to the USB port of a PC compatible computer to download information stored on the memory card.
Guess thats why its so good, it updates every 0.1s and will calculate speed etc between these points.
£465 inc vat would love one but i think its a bit pricey for what I would use it for, if you're going out on a track alot then it would be invaluable.
useful write up s8) 8) s8)
yeah!
but they have a cheaper option in the performance box, which gives you alot of useful performance data?!
what you think of that one
I'm pretty confident I can exactly match all that functionality (you would just need to use the software with a GPS receiver that samples at 10Hz or higher). The accuracy with a cheapo 1Hz Receiver should be pretty close too using a good prediction algorithm. I would say +/-3 tenths at worst even though the receiver is 10 times slower.
Quote from: "rtbiscuit"NEW MR2 ROADSTER 0-60 RECORD TIME 3.2 SEC s8) 8) s8)
and all because i fitted the new flux capacitor,
new enlarged dolphin valves
and racing donkey flanges!
car goes like lightening now, beat you all! s:wink: :wink: s:wink:
Actually I got 2.5 on may way to work the other day.
Which surprised me as I was sitting in stop start traffic!
I had a little issue with the install. I chose other location, Ipaq File store and although it created the directory properly, it actually installed the files in "%install dir%". Never mind!
Simon
darn,,, foundmy brother's GPS pocket pc thingy.. turned it on.. white screen.. GRR.. it makes sounds... but even a hard reset wont do anything!! oh well.. better look for a new one on ebay.
Quote from: "muffdan"I'm pretty confident I can exactly match all that functionality (you would just need to use the software with a GPS receiver that samples at 10Hz or higher). The accuracy with a cheapo 1Hz Receiver should be pretty close too using a good prediction algorithm. I would say +/-3 tenths at worst even though the receiver is 10 times slower.
Is this software still available? s8) 8) s8)
im still looking for a copy too, help please
well looks like Jason's been busy with this software idea
m http://www.pocketgear.com/en_US/html/di ... rod5480769 (http://www.pocketgear.com/en_US/html/display_product.jsp?id=prod5480769) m
looks good, well spotted stu ! s:) :) s:)
actually i cant take credit for that one, it was posted on the GTR forum, i just recognised it as his work
Its still available, but I've been meaning to add some new stuff to it for a while, but not gotten around to it since my daughter was born!
Here's the latest version though:
http://www.jfmstudios.com/GPSPerformance.zip
Anyone who wants to buy please use the above download, I can give club members paying via paypal a 20% discount on these orders, just PM me first to let me know who you are!
Hi Matey, will that include a discount on the Symbian version too??? s:wink: :wink: s:wink: and if its loaded onto the Nokia N95 will it be able to use the internal GPS reciever??
I would be interested on that for the N95 as well, might take an hour for it to get a signal - but it could be fun!
Quote from: "Liz"I would be interested on that for the N95 as well, might take an hour for it to get a signal - but it could be fun!
First TTET to take over an hour to get to 60? s;) ;) s;)
I had no symbian version planned primarily because I don't have a symbian device to develop it on!. If there's a demand for it though, I may consider trying to hunt one down... ?
Quote from: "Liz"I would be interested on that for the N95 as well, might take an hour for it to get a signal - but it could be fun!
Liz, you know theres an update for the origional N95 to include A-GPS, it'll startup a hell of a lot quicker
my assumption there, i saw the picture on that website and assumed it was for a mobile phone s:oops: :oops: s:oops:
but if you did do one, i'm sure it would sell, especially here and places like GTROC who origionally posted
I'd get one for a symbian phone (although would need to buy a BT gps thingy).
Quote from: "northernalex"I'd get one for a symbian phone (although would need to buy a BT gps thingy).
Alex, When I get my upgrade I may well have a spare one s:wink: :wink: s:wink:
lol. Phil I'll swap you for a CF BFW s:) :) s:) ... s:) :) s:)
Quote from: "northernalex"lol. Phil I'll swap you for a CF BFW s:) :) s:) ... s:) :) s:)
Deal. I could probably do something with that s;-) ;-) s;-)