LSD?????????

[SWIFTY]

I no my car has not got a lsd as when i give it some stick it only leaves 1 tyer mark on the road what i need to no is should it have one?? if yes my gear box must be rong!!

[SWIFTY]

have read the site given and helped thank you!!! =D> =D>

[Lauren]

So basically having a LSD on a MR car is asking for trouble... I thought the idea of LSD was to make the car corner more safely.

I know you're not having a go.. but now I'm totally confused.

Why would one want a LSD (as it was optional on earlier revs) if it makes you slide around corners and "drift" as this isn't the fastest or safest way to drive on the road.

I was under the impression a LSD made the car handle and corner a lot better than an open diff car. As the back end breaks away easier as the inside wheel has already lost traction (ie its being pushed over the tarmac)

Think its time for me to do some reading on LSDs!!

Cheers though

Dave!

An LSD on a MR car is so much fun, but it is trickier to handle than an open diff so if you are a skilled driver and know how to handle a MR car then cool, but if you are not used to it and have come from drivng FF cars, then the first time you lock the diff up coming out of a corner may come as something of a surprise.

think of it this way if you spin an inside wheel on a corner (open diff) then though the car might slide a little, the effect is not overly pronounced. But if you spin both wheels because the diff has locked up, not only are you going faster but now the rear end will step out far more quickly.. people panic get into a fishtail and inevitably the accident happens further up the road!

An LSD doesn't make you drift. Like i said in the right hands you can get out of a corner more quickly and cleanly with an LSD because you have greater traction as the power is more evenly distributed between the wheels because one wheel is not allowed to accelerate without the other. This means you can get on the power earlier. So it is quicker and this is most noticeable out of slow speed corners.

In faster corners you can use the LSD to balance the throttle as you drift out toward the exit curb. when i say 'drift' i don't mean jap style i mean in a 4-wheel drift where the steering is pretty much straight and the tyres are at an optimum slip angle. A bit like this, though note i am slightly oversteering:

[MegatronUK]

As I understand it, there are 3 kinds of mk2 gearbox:

1. Plate-type LSD (e.g some rev1 cars and some aftermarket)
A plate-type diff WILL rotate both wheels in the same direction if jacked up and turned by hand. This is the 'old school' type of LSD, and most 'agressive'. The wheels (that should read 'driveshafts') are connected physically by a series of plates which resist slipping. They can be noisy and rattly and they do eventually wear out (most plate type diffs can be serviced and worn plates replaced though).

2. Viscous coupled LSD (later models e.g rev2/3+)
Similar to the ones fitted to the ST185 and ST205 GT4, which has at least one viscous coupled LSD (I can never remember if it is the front or rear!). Turn one wheel and the wheels turn in opposite directions... turn the prop and they turn in the same direction. Confused?, you betcha! These diffs will only start to lock under power when one wheel starts to slip - power will then be transferred to the other wheel, still allowing the car to move. Much more civilised in day to day driving. Most modern cars with LSD have these.

3. Non-LSD
Wheels will rotate in the opposite direction to each other if turned by hand. No lsd. If one wheel spins, all power will be transferred though that wheel as the path of least resistance. e.g it will sit there and spin.

Plate diffs can be identified easily. Both wheels spin the same way. The trouble is telling the difference between viscous coupled and a normal diff; they act the same in the 'rotate by hand' test. It's chassis code time for those ones.

[pnjmcc]

Does anyone know if any of the autos had an lsd fitted as an option?

TIA

Regards
PaulM
92 G-Ltd.

[CJ B]

As I understand it, there are 3 kinds of mk2 gearbox:

1. Plate-type LSD (e.g some rev1 cars and some aftermarket)
A plate-type diff WILL rotate both wheels in the same direction if jacked up and turned by hand. This is the 'old school' type of LSD, and most 'agressive'. The wheels (that should read 'driveshafts') are connected physically by a series of plates which resist slipping. They can be noisy and rattly and they do eventually wear out (most plate type diffs can be serviced and worn plates replaced though).

2. Viscous coupled LSD (later models e.g rev2/3+)
Similar to the ones fitted to the ST185 and ST205 GT4, which has at least one viscous coupled LSD (I can never remember if it is the front or rear!). Turn one wheel and the wheels turn in opposite directions... turn the prop and they turn in the same direction. Confused?, you betcha! These diffs will only start to lock under power when one wheel starts to slip - power will then be transferred to the other wheel, still allowing the car to move. Much more civilised in day to day driving. Most modern cars with LSD have these.

3. Non-LSD
Wheels will rotate in the opposite direction to each other if turned by hand. No lsd. If one wheel spins, all power will be transferred though that wheel as the path of least resistance. e.g it will sit there and spin.

Plate diffs can be identified easily. Both wheels spin the same way. The trouble is telling the difference between viscous coupled and a normal diff; they act the same in the 'rotate by hand' test. It's chassis code time for those ones.

I just removed the gearbox from a car and it acts like option 2 above.
Its a rev2 gearbox (electronic speedo).
Are there any ID marks on the gearbox or other ways of knowing if its LSD or not

[Lauren]

As I understand it, there are 3 kinds of mk2 gearbox:

1. Plate-type LSD (e.g some rev1 cars and some aftermarket)
A plate-type diff WILL rotate both wheels in the same direction if jacked up and turned by hand. This is the 'old school' type of LSD, and most 'agressive'. The wheels (that should read 'driveshafts') are connected physically by a series of plates which resist slipping. They can be noisy and rattly and they do eventually wear out (most plate type diffs can be serviced and worn plates replaced though).

2. Viscous coupled LSD (later models e.g rev2/3+)
Similar to the ones fitted to the ST185 and ST205 GT4, which has at least one viscous coupled LSD (I can never remember if it is the front or rear!). Turn one wheel and the wheels turn in opposite directions... turn the prop and they turn in the same direction. Confused?, you betcha! These diffs will only start to lock under power when one wheel starts to slip - power will then be transferred to the other wheel, still allowing the car to move. Much more civilised in day to day driving. Most modern cars with LSD have these.

3. Non-LSD
Wheels will rotate in the opposite direction to each other if turned by hand. No lsd. If one wheel spins, all power will be transferred though that wheel as the path of least resistance. e.g it will sit there and spin.

Plate diffs can be identified easily. Both wheels spin the same way. The trouble is telling the difference between viscous coupled and a normal diff; they act the same in the 'rotate by hand' test. It's chassis code time for those ones.

I just removed the gearbox from a car and it acts like option 2 above.
Its a rev2 gearbox (electronic speedo).
Are there any ID marks on the gearbox or other ways of knowing if its LSD or not
Image Replaced With URL For Quote http://url.photobucket.com/albums/v205/ ... 022006.jpg
Image Replaced With URL For Quote http://url.photobucket.com/albums/v205/ ... 006001.jpg

stick the driveshafts in and rotate one. if the other turns the same way then LSD. if it turns the other then no LSD. obviously do this in neutral.

[CJ B]

As I understand it, there are 3 kinds of mk2 gearbox:

1. Plate-type LSD (e.g some rev1 cars and some aftermarket)
A plate-type diff WILL rotate both wheels in the same direction if jacked up and turned by hand. This is the 'old school' type of LSD, and most 'agressive'. The wheels (that should read 'driveshafts') are connected physically by a series of plates which resist slipping. They can be noisy and rattly and they do eventually wear out (most plate type diffs can be serviced and worn plates replaced though).

2. Viscous coupled LSD (later models e.g rev2/3+)
Similar to the ones fitted to the ST185 and ST205 GT4, which has at least one viscous coupled LSD (I can never remember if it is the front or rear!). Turn one wheel and the wheels turn in opposite directions... turn the prop and they turn in the same direction. Confused?, you betcha! These diffs will only start to lock under power when one wheel starts to slip - power will then be transferred to the other wheel, still allowing the car to move. Much more civilised in day to day driving. Most modern cars with LSD have these.

3. Non-LSD
Wheels will rotate in the opposite direction to each other if turned by hand. No lsd. If one wheel spins, all power will be transferred though that wheel as the path of least resistance. e.g it will sit there and spin.

Plate diffs can be identified easily. Both wheels spin the same way. The trouble is telling the difference between viscous coupled and a normal diff; they act the same in the 'rotate by hand' test. It's chassis code time for those ones.

I just removed the gearbox from a car and it acts like option 2 above.
Its a rev2 gearbox (electronic speedo).
Are there any ID marks on the gearbox or other ways of knowing if its LSD or not
Image Replaced With URL For Quote http://url.photobucket.com/albums/v205/ ... 022006.jpg
Image Replaced With URL For Quote http://url.photobucket.com/albums/v205/ ... 006001.jpg

stick the driveshafts in and rotate one. if the other turns the same way then LSD. if it turns the other then no LSD. obviously do this in neutral.

So what Megatron said isn't right then????

[JekylandHyde]

Jacking up a MR2 from 1990-1998 and spinning the wheels will NOT tell you if you have LSD. It's a viscous unit and does not play by the same rules as the clutch type.

The only ways to know if you have LSD on the MR2:
1. Check the code posted above in the 2nd or 3rd post.
2. Pop the axles out and look through the diff. If you can see straight through, you do not have LSD. If there is a bar going through the diamter the hole, you have LSD.
3. Put down serious power coming out of an incredibly sharp right-hand turn (preferably uphill). If you spin the p-side rear tire, you do not have LSD.

No road car has a 'fixed' diff!!! Most have open diffs. You are wholly wrong, no question.

... some have worse. Some Ford Mustangs have solid rear axles
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[TRD 2000GT]

What LSD do you think I have then?

It's locks up very easily turning tight corners - can't really notice it after 50mph or so.

Also how is best to drive with it round corners given what you said about handling?

Cheers

Andy

[CJ B]

Yup, theres a bar which spins around!
Thanks!

Chris.

[JekylandHyde]

What LSD do you think I have then?
It's locks up very easily turning tight corners - can't really notice it after 50mph or so.

What do you mean it "locks up."

Also how is best to drive with it round corners given what you said about handling?

If you do NOT have LSD, you have to be more light-footed putting power down out of turns as you risk spinning the tires.

If you have LSD, just put the power down as you feel safe enough (ro brave enough!) to do.

The MR2s factory LSD really is only a benefit for racing around turns,
it offers almost no benefit for drag-style launching.

[TRD 2000GT]

Around tight corners it will clunk pretty loud - Everyone who has seen me take roundabouts or corners can see it lock then unlock.

Make sense?

[JekylandHyde]

If it is clunking going around turns, chances are you have one of the aftermarket clutch-type LSDs.

I've only ridden in one MR2 with that type and I could not stand it.

[TRD 2000GT]

Yeah it's not the nicest of sounds - but I was surprised about the handling comment as it feels a heck of a lot more secure than my last mr2 (without lsd). Granted a completely different setup.

[Harry]

great topic subject....have read it all 3 times...and still tbh can not
work my head through it...

understand the concept,principal and driving realationship,but can not see the technical blueprint of it all...

[TRD 2000GT]

Also when taking a longish corner or roundabout you can feel it bite (makes the clunking noise) and this edges you closer to the curb but then eases off so you dont hit the curb. Basically making cornering really tight. Hope that makes sense.

[tonigmr2]

I know exactly what you are talking about - my (specially built) drift car has the same characteristics. Sounds like you have a rather aggressive 2 way diff - I'd enjoy it if I were you

T

[TRD 2000GT]

Oh i do enjoy it trust me - however I wish I knew more about it.

I would be interested to see what you think of the setup sometime.

[tonigmr2]

Well I'm sure I could spare the time to take a ride in a TRD car

Seriously it will clunk, particularly at slow speed. There's nothing wrong with that, just make sure you are sympathetic with the oils you use (personally I use Redline).
T