Limited Slip Diff Help...

[Sanchi]

Hi,

On my rev 2 turbo how can i tell if it has a limited slip diff? Is there anything on the dashboard to look out for or anything mechanical?

Thanks...

[Ian Geary]

There's been posts about the chassis number/ gearbox number somewhere that will tell you if you've got one.

Mechanically, if you jack both rear wheels up and rotate one, the other wheel will either:

rotate the opposite way - no LSD
rotate the same way - with LSD.

I hope I've got this the right way round [-o< else I'll look

hth

Ian

[Sanchi]

ok nice one mate will check it out in the morning ...

[nisnos]

yes ian thats correct
LSD same way
non lsd opposite way

[Quigonjay]

To verify if your car has a LSD, check the vehicle identification plate on the inside of front bonnet. There are a number of codes given there, including the transmission type, whose code starts with the sequence "A/TM"

For example, A/TM:- 735/E153

If the last digit before the /E153 is a '3' or a '5' then the car has a LSD - therefore in the example above it does.

The second part of the code is the transmission type- E153 is a heavy duty manual transmission for the Turbo

nicked from Benf's site

[nisnos]

sorry quigon but mine had a 153 code but no lsd - rev 1 tubby - apparently on some models it was an optional extra.
just my luck eh!
still the mechanical test is easy enough

[jont]

There was another thread on here about this recently (try a search on LSD).

As quigonjay said, it's not the 153 code that matters, it's the number *before* that bit eg 735. (5 means it does have an LSD).

As for the rotation of wheels, that's true with a plate diff (which there are some aftermarket MR2 diffs), but the standard one is a viscous coupled diff which means it'll only come into play when the wheels are under load, so jacking it up and seeing which direction the oppposite wheel turns in will be inconclusive (ie it'll turn in the opposite direction regardless of whether it has an lsd or not).

HTH,

Jon

[BenF]

Cheers Jay

Yes, its the last digit that counts. Most early Mk2s though are getting to an age where it is possible that a replacement gearbox may have been fitted, in which case jacking the car up and checking the direction of rotation of the rear wheels is the only sure test.

[mushky]

Apparently you can test it yourself if you can find a big bit of empty road. Put full steering lock on, rev to about 4K and then drop the clutch. If it spins you right round then you have an LSD. Haven't tried it myself yet.

[Sanchi]

kool... ill jack the car up and give it a try... i cant pop my bonet coz the cable is broke! . Not bothered tho coz this turbo is only going to be scraped for a engine transplant into my 3sfe. And before any1 asks i cant get insured on a import or turbo, hence the reason for the transplant!

[speedtwelve]

Sanchi

Who are you getting to do the insurance on your N/A MR2 with the turbo engine transplant? I would have thought that the premium would be at least as high if not higher then insuring a stock MR2 turbo anyway???

[paul port]

Apparently you can test it yourself if you can find a big bit of empty road. Put full steering lock on, rev to about 4K and then drop the clutch. If it spins you right round then you have an LSD. Haven't tried it myself yet.

Note...
The stock Toyota 'Viscous' LSD is poo!
If you have one wheel slipping on wet leaves, the other wheel will not have the power to haul you up a curb

Dropping the clutch will show you nothing if you have a stock LSD.



The sure fire way of knowing if you have a stock Viscous LSD is:

Leave car in gear to lock the diff input shaft.

Jack up back end, Handbrake off

Rotate one wheel.

If the wheel rotates freely (the other wheel spinning freely in opposite direction because input shaft is locked by the engine) - you do not have a stock viscous LSD.

If however the wheel turns like it is stuck in toffee - congratulations, you now know just how much split torque limiting the stock LDS gives (not enough)

Paul

[JJ]

Note...
The stock Toyota 'Viscous' LSD is poo!

I second that ! Does a reasonable job .... but very hit and miss !

[Sanchi]

Sanchi

Who are you getting to do the insurance on your N/A MR2 with the turbo engine transplant? I would have thought that the premium would be at least as high if not higher then insuring a stock MR2 turbo anyway???

Hey speedtwelve,

im gonna be a bit of a naughty boy and not tell the insurance company of the transplant just yet!

[jonb-]

Sanchi

Who are you getting to do the insurance on your N/A MR2 with the turbo engine transplant? I would have thought that the premium would be at least as high if not higher then insuring a stock MR2 turbo anyway???

Hey speedtwelve,

im gonna be a bit of a naughty boy and not tell the insurance company of the transplant just yet!

At the time when you're mostly likely to stack it with one of the most obvious mods you could make you choose not to tell them.

[Sanchi]

At the time when you're mostly likely to stack it with one of the most obvious mods you could make you choose not to tell them.

Its not a biggy will eventually tell them, but its only like a sunday project car at the moment...