@furbern said:

....the auto adjust can't work if there is more than 1mm clearance ie slack on the pads. When I did the rebuild I wound the caliper pistons all the way back ..... the pads might have been too slack.

As @Ardent mentions the locating "nipple", on the pad must be seated correctly, after winding  the piston fully in and ensuring that the cut outs in the piston head are in a N/ S position. The piston may need to be wound out  to achieve this position.
With the pads installed they must be operated/ pumped out with the brake pedal, slowly, firmly and several times until much resistance is felt.
If the wheels are off the ground the wheel/ disc could be rotated and the pumping repeated when the pedal should still feel hard unless the disc is distorted ( you then have another problem).


In this position the pads will be touching the disc, there should be no measurable gap ( certainly  not 1mm) the friction only relieved by the flex action of  the piston seal.

That is the starting position for adjusting the hand brake, the cable for which you will have slackened off before starting the above procedure.

Quote from: fawtytoo on Today at 18:31I very much doubt Windows 98 will work directly on a Windows 7 computer. It won't have drivers for most of the hardware.

Persevere with the VM. Do you have any other USB hardware that you can test with to try and rule out communication issues? A USB drive perhaps and preferably nothing USB 3.0.

Prior to installing new drivers onto the win98 it would see a usb mouse ok but the Greddy software had the comms ports greyed out. I could change parameters / maps etc
Post installing the drivers the comms ports were black but it thought the main unit was plugged in and said online even though it wasn't. I also lost the ability to change parameters / maps etc.
Our IT department are struggling (I'm not that tech savvy) to solve it so they are currently looking for really old pc's to install Win98 on.

I'm actually thinking at the minute I might have to go back to green injectors, fit a rising rate fuel regulator using the stock ECU as I'm running out of time.

I'm away this weekend, on holiday for 2 weeks following Saturday and only have 1 weekend when I get back to get mapped, MOT'd, alignment and then the weekend after is Barbon hillclimb which I'm entered in.

bit of a nightmare to be honest

Quote from: tets on Yesterday at 18:45Next one is to clean the laptop and load win 98 onto it

I very much doubt Windows 98 will work directly on a Windows 7 computer. It won't have drivers for most of the hardware.

Persevere with the VM. Do you have any other USB hardware that you can test with to try and rule out communication issues? A USB drive perhaps and preferably nothing USB 3.0.

As above. The self adjusting mech is not working as it should.
The pads should have an interference fit to the disc. No gap.

Take the nipples on the back of the pads are seated correctly in the piston slots.

Quote from: shnazzle on Yesterday at 22:441. Where'd the emanage come from? Another MR2?
2. Guessing you tried with the injectors set to 170? Unless you have 320s of course. Even then it should still fire at least, fumble and die.
3. What kind of wiring? Boomslang or self-wired?

Hi Patrick

Sorry, should have said I'd tagged you as I got it from you with the harness - I don't think it's anything to do with the unit but the Win98 virtual machine.

When we first installed it the comms ports were greyed out but I could set displacement (1794cc) and parameter settings (so 260 - 320cc) and I saved that blank map with just those settings changed. We then added USB drivers to Win98 but now all 3 comms ports state online before I plug the main unit in hence I don't think it added the map.

I have 2ZZ yellow injectors - the latest spec is on my most recent readers rides!

Never "messed" with a piggyback so not sure what to expect - I also couldn't find anywhere to check which map is already on the unit which then convinced me iy hadn't connected properly.

cheers
Steve

1. Where'd the emanage come from? Another MR2?
2. Guessing you tried with the injectors set to 170? Unless you have 320s of course. Even then it should still fire at least, fumble and die.
3. What kind of wiring? Boomslang or self-wired?

@furbern

Having replaced the rear calipers on my car and refitted the part worn discs and pads and subsequently done not a lot of miles but passed two MOT's I suggest that the your part worn pads are not the cause of your problem.
You will be aware that disc brakes are self adjusting so the state of wear, within limits, should not adversely affect the system.

Thanks very much, I have read it actually and my car does have the MGTF gaiters fitted. A couple of years ago one of the calipers seized. I bought rebuild kits and rebuilt the rear calipers(not the first calipers I had rebuilt), however once back on the car I couldn't get the handbrake to adjust up. So I bought 2 new calipers, and they were OK but it looks like one of those has stuck now (I don't do a lot of miles in it). One thing I have read and it may account for my failure to get the original calipers to work is that the auto adjust can't work if there is more than 1mm clearance ie slack on the pads. When I did the rebuild I wound the caliper pistons all the way back, but the pads weren't new as they and the discs were only slightly worn. I am wondering if that might account for the problems on the original calipers, ie the pads might have been too slack. I have yet to investigate the current problem. But the design is just awful. I have a 2009 Ford also with the handbrake on the rear discs - it has always held on my drive which is 1 in 5, no problem.   

having an issue connecting a Virtualbox Win98 to the laptop.

background is an old Win 7 laptop (which runs well) with Virtualbox and Win 98 running.
Had issues trying to get it to see the USB (which IT at work fixed)

Plugged it in, opened a blank map with injectors changed to 320cc to get it started.
Everything looked good, Greddy software said online so saved and tried to fire it - nothing!

Noticed a lot of things were now greyed out including settings (which I'd previously used to change the injector size)

Anyway got home and the software still says online and everything is greyed out (pic attached)

Any ideas - possibly one for @shnazzle

Next one is to clean the laptop and load win 98 onto it

I do have a vid but can't upload it - I'll have a look (I am a bit technologically retarded at times)

You cannot view this attachment.