anyone got an LSD taking up too much space in their garage?
Discussion
Planning winter projects...and when I jacked up the rear of the car and spun the wheels the went in opposite directions....mmmm, thinks...therefore i could be going round corners faster if i change the diff... 
I know its a flange size thing to worry about and AA codes etc, thought my search would be easier/cheaper if someone had a spare already...
I know its a flange size thing to worry about and AA codes etc, thought my search would be easier/cheaper if someone had a spare already...
with this type of diff even the LSD ones turn in opposite directions
I think (may be wrong) that you need two people - one to hold the input flange still and then another to try and turn one output flange while holding the other still. With an LSD it should be VERY stiff to turn one flange while keeping the other two still.
I think (may be wrong) that you need two people - one to hold the input flange still and then another to try and turn one output flange while holding the other still. With an LSD it should be VERY stiff to turn one flange while keeping the other two still.
magpies said:
with this type of diff even the LSD ones turn in opposite directions
I think (may be wrong) that you need two people - one to hold the input flange still and then another to try and turn one output flange while holding the other still. With an LSD it should be VERY stiff to turn one flange while keeping the other two still.
Interesting.... I wasn't sure if mine was and couldn't reach the nametag because it is corroded.I think (may be wrong) that you need two people - one to hold the input flange still and then another to try and turn one output flange while holding the other still. With an LSD it should be VERY stiff to turn one flange while keeping the other two still.
What if I jack it up so that both rear wheels are in the air and not blocked by anything, then put it in gear to lock the input and then try and turn one of the wheels. Then one wheel is stiff to turn..... Will that indicate an LSD?
Edited by AutoAndy on Friday 19th August 21:00
The sort of viscous diff that was fitted as standard on the V8S behaves just like an open diff if you test it like this. It needs a much higher differential wheel speed before the slip limiting effects are apparent. They're also IMO a complete pos and if you're going to the bother of fitting an LSD I suggest you fit a proper one.
Friction plate LSDs would normally have a preload in which case it will feel as if the axle is solid when you try to turn the wheels by hand. However, even when they're worn and lost their preload they still work reasonably well, but will be harder to recognise just turning the wheels by hand.
Friction plate LSDs would normally have a preload in which case it will feel as if the axle is solid when you try to turn the wheels by hand. However, even when they're worn and lost their preload they still work reasonably well, but will be harder to recognise just turning the wheels by hand.
AutoAndy said:
What if I jack it up so that both rear wheels are in the air and not blocked by anything, then put it in gear to lock the input and then try and turn one of the wheels. Then one wheel is stiff to turn..... Will that indicate an LSD?
I don't know if that will work?turning the flange on the disc you'll have very little leverage so "stiffness" should be easily detected. with the extra leverage of the wheel this stiffness may not be so easily detectable?
GreenV8S said:
They're also IMO a complete pos and if you're going to the bother of fitting an LSD I suggest you fit a proper one.
Viscous LSD's may not be the best thing in the World but gotta be better than nothing (an open diff) haven't they?phillpot said:
Viscous LSD's may not be the best thing in the World but gotta be better than nothing (an open diff) haven't they?
Agreed they're better than an open diff, but if you're going to the trouble of changing the diff then fit an LSD that works well rather than one that works ish.Interesting replies guys...looking At my text it doesn't completely make sense, and I wasn't even drunk...
To clarify what I did so far;
Jacked up both wheels in air and in neutral - turn one wheel and the other turns the opposite way.
Jacked up with one wheel on the ground so it can't move, then car put in gear, I could just turn the other wheel by hand, but very stiff
Name tag is there but just rusty aluminium with no definition.
Alan, if your diff has it's name tag, then the numbers can tell the type....covered by others on here on another post
Keep it coming...
To clarify what I did so far;
Jacked up both wheels in air and in neutral - turn one wheel and the other turns the opposite way.
Jacked up with one wheel on the ground so it can't move, then car put in gear, I could just turn the other wheel by hand, but very stiff
Name tag is there but just rusty aluminium with no definition.
Alan, if your diff has it's name tag, then the numbers can tell the type....covered by others on here on another post
Keep it coming...
Nothing wrong with a good viscous LSD imho, I've not run a plated diff that wares out but have had a couple of viscous ones and a quaife ATB item. Yes the quaife was better but it was also £1200. I now run viscous on my 7" diff and it still works very well so much so that it makes the quaife look very expensive.
To be honest this whole conversation is a bit weird I found it very noticeable that I had an LSD of either kind fitted to the S. Without one you would spin a wheel trying to exit a junction quickly. But if you've not driven LSD vs no LSD then perhaps it's not so easy. And looking at a dif on the bench etc it's a bit harder.. Take the back off and have a look maybe?
Once you have one you will notice the difference.
Cheers
Damian
To be honest this whole conversation is a bit weird I found it very noticeable that I had an LSD of either kind fitted to the S. Without one you would spin a wheel trying to exit a junction quickly. But if you've not driven LSD vs no LSD then perhaps it's not so easy. And looking at a dif on the bench etc it's a bit harder.. Take the back off and have a look maybe?
Once you have one you will notice the difference.
Cheers
Damian
magpies said:
Jack up both rear wheels and put in gear. Have friend hold one wheel and try moving the other. Open diff will allow wheel to rotate quite freely whereas lsd it will be difficult to turn
Ok Mick, so my similar one-man version of;Jacked up with one wheel on the ground so it can't move, then car put in gear, I could just turn the other wheel by hand, but very stiff
....would indicate that I have a viscous lsd....would the team agree?
Plan b....to try some hard acceleration ....in a safe environment of course...
AutoAndy said:
magpies said:
Jack up both rear wheels and put in gear. Have friend hold one wheel and try moving the other. Open diff will allow wheel to rotate quite freely whereas lsd it will be difficult to turn
Ok Mick, so my similar one-man version of;Jacked up with one wheel on the ground so it can't move, then car put in gear, I could just turn the other wheel by hand, but very stiff
....would indicate that I have a viscous lsd....would the team agree?
Plan b....to try some hard acceleration ....in a safe environment of course...
don't try for 11's best try for JJ's gravel or grass is best but from stand still apply full lock and then give id beans for 1 or 2 seconds (not longer so less chance of getting out of control if you are not used to this) and with an lsd it will swing the back end of the car around. With a free diff it will spin up the inside wheel.
DamianS3 said:
Nothing wrong with a good viscous LSD imho
My S2 had the standard open diff and it handled quite nicely on a dead flat surface but if the car was moving around it was hard to predict whether it was going to spin one wheel and understeer, or spin both and oversteer. It would often wobbly uncomfortably between the two over undulations.The viscous diff that the V8S came with was better in that it gave consistent handling and good traction at high speed, but at low speed it behaves almost like an open diff and needs a considerable amount of wheelspin on the inside wheel before it starts transferring torque to the outside wheel. This is inherent in the design of the diff because it works based on the speed differential between the two wheels. That could be viewed as an advantage around town if you want a car that is easy to park, but it means accelerating hard out of slow corners you're smoking the inside tyre and throwing traction away. OK in that it is predictable, but still cr@p.
A friction plate diff or any of the gear-based diffs that work on friction is better because it will transfer torque at zero slip under high load but still allow differential movement under low load. If your priorities are performance and handling, I suggest this is the type of diff to go for.
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