MR2 Roadster Owners Club

The Workshop => Maintenance, Problems & Troubleshooting => Topic started by: Anonymous on June 25, 2003, 18:35

Title: LSD
Post by: Anonymous on June 25, 2003, 18:35
Any idea  how (easily if possible) to tell if a pre '03 had an LSD fitted (I believe they were an option)?  I ask because I've bought mine second hand, and the dealer mentioned Traction Control, and while obviously as a non-SMT '2, it's not got what you'd call TC, I guess an LSD could be desribed as TC (in a wierd sort of way).
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Post by: Anonymous on June 25, 2003, 19:13
I think all UK cars have LSD (thats what everyone says on here anyway). Its only some of the imports that dont IIRC
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Post by: Anonymous on June 25, 2003, 19:28
Yep, correct. Unless an import, all have LSD.
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Post by: Anonymous on June 25, 2003, 19:39
Blimey.  And there was me thinking it was standard only on the '03 models.  That would help explain why it goes round corners so damn well.
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Post by: Anonymous on June 25, 2003, 19:42
Quote from: "phil4"Blimey.  And there was me thinking it was standard only on the '03 models.  That would help explain why it goes round corners so damn well.

Thats what i originally thought until everyone on here told me different!   s:o :o s:o
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Post by: Anonymous on June 25, 2003, 23:29
So, back to the original question,   s:lol: :lol: s:lol:  How can you tell. Mine being German should alsi have lsd afaik but the proof?
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Post by: mph on June 25, 2003, 23:42
The only way to have real proof is to take the diff apart and look.

...however there is layman's way of finding if you have an effectively working LSD...

1) find a wet carpark with lots of space
2) add 4000-5000 rpm
3) select 1st gear and drop clutch

Result:
- one wheel spinning, and slight forward direction: no or ineffective LSD
- both wheels spinning, car magically facing 180degrees plus from where you started: LSD fitted & working

  s8) 8) s8)
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Post by: Tem on June 26, 2003, 07:41
For some weird reason, Toyota didn't make any noise of the LSD on 2000-2002 models...but made everyone believe it came on 2003. Go figure why  s:) :) s:)

mph's test is a good and easy one  s:) :) s:)  Another one is to jack the rear up and see if the other wheel turns when you turn the other one. Or start the engine and "run" it a bit...without LSD the left wheel won't spin, only the right one will.

(NEEDLESS TO SAY, but be damn careful if you start the engine while the car is up!)
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Post by: SteveJ on June 26, 2003, 08:15
Quote from: "Tem"For some weird reason, Toyota didn't make any noise of the LSD on 2000-2002 models...but made everyone believe it came on 2003. Go figure why  s:) :) s:)

mph's test is a good and easy one  s:) :) s:)  Another one is to jack the rear up and see if the other wheel turns when you turn the other one. Or start the engine and "run" it a bit...without LSD the left wheel won't spin, only the right one will.

(NEEDLESS TO SAY, but be damn careful if you start the engine while the car is up!)

A slight flaw in this argument - the LSD is of the torque-lock variety, and hence only locks up when the car is under load - this is why if you lift off mid-corner, the car seems to turn in much sharper - what a lot of people seem to think is lift-off oversteer when in reality it is actually the car turning in as sharp as it is capable of rather than the LSD induced understeer.

SteveJ
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Post by: Anonymous on June 26, 2003, 08:24
Thats interesting Steve. I hadn't thought of that when it has happened a couple of times. Nice one!!! You learn a lot from this place don't you?!!!  s:lol: :lol: s:lol:
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Post by: juansolo on June 26, 2003, 09:02
QuoteAnother one is to jack the rear up and see if the other wheel turns when you turn the other one

This only really works with things like plate LSD's.  

Torque Biasing Diffs, sometimes called Torsen (though that is a brand name) or ATB's (Automatic Torque Bias, what Quaife call them) act like open diffs when not in contact with the road.  They work by directing the torque to the wheel that has the most grip, so when an inside wheel trys to spin the power is directed to the outside wheel.  This is done to a ratio, IIRC Quiafe's are 5:1 and once this ratio is exceeded the diff goes 'open'.  Though usually by this time both rear wheels are spinning anyhow so it's not really an issue.

What this does mean is that they don't work very well in the snow, ice or loose surfaces as this ratio is exceeded almost instantly.  But they are seemless, silent and ideal for road applications.

The donut test is the easiest way to prove you have one.
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Post by: Tem on June 26, 2003, 09:33
Hmmmm...I'm pretty sure you can't keep the other wheel still when turning the other one. I remember trying to open the lug nuts after jacking the car up (yeah, silly me) and having a friend try to hold the wheel still on the other side. Oh well, maybe it was on the previous MR2...
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Post by: dancarbon on June 26, 2003, 13:01
Phil if you don't fancy spinning your car in a car park, you could just look a the log-book, it should say imported by a private importer at the top if it is not a UK car, I also think a country code should be on a sticker somewhere on the car too - I think UK cars are E3, but I could be wrong.

Of course if you do find it's been imported then you'd better head of to Tesco   s:D :D s:D
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Post by: Anonymous on June 26, 2003, 13:15
Cheers.  When I bought the car I had a HPI Check done that indicated it didn't have a DVLA import/export marker.  The previous owner was a UK dealer.  And there was no mention on the V5 of it being an import.  So I'm pretty sure it's a UK car.

As for the E3 sticker.  Have you any idea where it is?  The only sticker I can see so far is the "Made in Japan" one on the windscreen.
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Post by: Anonymous on June 26, 2003, 13:17
Quote from: "dancarbon"Of course if you do find it's been imported then you'd better head of to Tesco   s:D :D s:D
s:? :? s:?  

Don't get it.

--H--
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Post by: Anonymous on June 26, 2003, 13:22
Quote from: "phil4"As for the E3 sticker.  Have you any idea where it is?  The only sticker I can see so far is the "Made in Japan" one on the windscreen.

I got one of those Made In Japan stickers too!   s:lol: :lol: s:lol:
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Post by: Anonymous on June 26, 2003, 13:28
Look for a nylon label (like the ones you get in the back of shirts) at the bottom of one of your seatbelts.

Mine says 'E4' so I guess that must be the code for a UK car.

--H--
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Post by: SimonC_Here on June 26, 2003, 13:33
Quote from: "Hardcore"
Quote from: "dancarbon"Of course if you do find it's been imported then you'd better head of to Tesco   s:D :D s:D
s:? :? s:?  

Don't get it.

--H--

Tesco = Big wide car parks. and circular black rubber marks.   s:) :) s:)  

Simon
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Post by: dancarbon on June 26, 2003, 13:36
Quote from: "Hardcore"
Quote from: "dancarbon"Of course if you do find it's been imported then you'd better head of to Tesco   s:D :D s:D
s:? :? s:?  

Don't get it.

--H--

So he can see if it will spin as described  s:twisted: :twisted: s:twisted:
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Post by: Anonymous on June 26, 2003, 13:39
Found the E4 lable just where Hardcore described.

Cheers.
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Post by: Anonymous on June 26, 2003, 14:03
Quote from: "SimonC_Here"Tesco = Big wide car parks. and circular black rubber marks.   s:) :) s:)  

Simon
Bingo!

D'oh!  I'll get mi coat...

  s:oops: :oops: s:oops:  

--H--
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Post by: zud on June 26, 2003, 14:43
In case anyone's interested in some extra reading about various types of LSD, take a look at this...

   http://auto.howstuffworks.com/differential5.htm

I was looking for an explanation and found this quite clear (starting from little/no knowledge of the subject).  The site as a whole explains all sorts of things, from car bits to kitchen appliances!
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Post by: Anonymous on June 26, 2003, 14:56
I learnt about LSD's from playing GT3!

--H--
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Post by: SteveJ on June 26, 2003, 17:06
Quote from: "Hardcore"I learnt about LSD's from playing GT3!

--H--

Mental note - avoid Hardcore on the road unless he thinks he on his last 'life'   s:? :? s:?    s:shock: :shock: s:shock:  

SteveJ
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Post by: Anonymous on June 26, 2003, 17:12
Are you trying to say that in real life you can't sideswipe another car at 150mph and drive on without any damage to your car whatsoever?...

--H--
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Post by: filcee on June 27, 2003, 09:43
Quote from: "juansolo"What this does mean is that they don't work very well in the snow, ice or loose surfaces as this ratio is exceeded almost instantly.  But they are seemless, silent and ideal for road applications.

The donut test is the easiest way to prove you have one.

Then I think my 2001 SMT has one, because:

1. I can't get it off the drive when it snows.  My drive goes uphill, and as soon as the driving wheels get on the snow all forward motion stops - but the wheels don't.  

2.  If it is icy I can get it to start swapping ends by applying any amount of acceleration in 1st or 2nd gear.

I can't vouch for mph's donut test  - I've never attempted to slot it into 1st gear with a whole huge amount of rpm showing.  Guess I'm still worried about destroying the clutch by not being careful with the mechanics.  s:roll: :roll: s:roll:

I'm interested to find out what happens with the new SMT which has all the nanny buttons fitted ...
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Post by: Anonymous on June 27, 2003, 09:58
Quote from: "filcee"nanny buttons

  s:) :) s:)
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Post by: GSB on June 27, 2003, 10:04
Quote from: "Hardcore"Look for a nylon label (like the ones you get in the back of shirts) at the bottom of one of your seatbelts.

Mine says 'E4' so I guess that must be the code for a UK car.

--H--

The UK car is in fact a European maket spec car fitted with a couple of extra bits at the port by Toyota UK (Roadster badge, alarm etc...), Hence my car that I bought in Denmark also has "e4" written on the belts. It has got an LSD though...
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Post by: mph on June 29, 2003, 00:04
Quote from: "filcee"I can't vouch for mph's donut test
I would like to point out that a) this isn't my test; and b) I've never done it myself!   s:) :) s:)
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Post by: filcee on June 30, 2003, 10:20
Quote from: "mph"this isn't my test

Sorry, I didn't mean to implicate you in future cases of car park over-exuberance by ROC members   s:wink: :wink: s:wink:  

Quote from: "mph"I've never done it myself!   s:) :) s:)

Shame!  s:lol: :lol: s:lol:  I thought you would have at least tried it once - especially with all that loverly extra horsepower you now have ....

.... then again - repairs are at your own expense ....

filcee
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Post by: Anonymous on May 10, 2004, 22:27
Hi,

I could not help doubting at times whether I had an LSD on my '2   s:?: :?: s:?:  

I think there's a way of checking the presence of an LSD by decoding the numbers and letters on the chassis' ID plate.

I had found a site that explained how to determine it for a Toyota RAV4 (my wife's car) but could not find it anymore...

Here's a link to a Supra owner's web site that provides explanations: (haven't checked the codes though...)

http://cjsupra.kendra.com/graphics/ModsPage/diffdeco.jpg

Maybe Toyota could check from the chassis/engine/tranny codes?   s:wink: :wink: s:wink:  

Could be useful if you're planning an import.

By the way, in some countries (Switzerland, France, etc.), when you import a car from outside the EU, you *have* to add the E4 labels on the seat belts...  

cheers,

John
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Post by: Tem on May 11, 2004, 06:27
Quote from: "phat"I think there's a way of checking the presence of an LSD by decoding the numbers and letters on the chassis' ID plate.

Have you read this?
 m http://www.mr2roc.org/forum/viewtopic.php?t=929#12577 (http://www.mr2roc.org/forum/viewtopic.php?t=929#12577) m