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Do a burnout. If both wheels spin up you most likely have an LSD. If it's a one legger it's an open diff. :D

EDIT: oh you said without doing a burnout, my bad - You could also try driving around in circles with too much throttle to see if you can spin up the inside wheel.

Edited by Big Rizza
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Doing a burnout wouldn't really tell you if you had an lsd anyway. A mate of mine was convinced his VT commy had an lsd cos it always got both wheels going.

But it didn't, just a standard diff.

I think the code/part no. on the diff should tell you. Look it up in a manual for that car, it will tell you what code is for what diff.

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  • 2 weeks later...
if it was open diff, which wheel is usually the one powered anyways? is it the right one or does it depend on which model it is, i.e. r32 gts/gtst, r33 gts/gtst, etc.

The power goes to which ever wheel is easier to turn. So in normal driving it will go to both wheels just like an LSD. In tight cornering it will allow the outside wheels to turn more than the inside wheel to prevent the back end skipping (which happens in very tight or locked diffs). But if one wheel starts to slip with an open diff, that wheel will be easier to turn and hence will get all the power. An LSD essentially doubles the traction because you need enough force to spin up both the wheels rather than just one (not quite true, but you get the idea).

On an aside, Ferrari claim their new E-differential is so good that it gives their rear wheel drive F430 as much traction as a conventional all wheel drive system (for example in the Lamborghini Gallardo) in all conditions except snow. But Ferrari claim a lot of things...

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The Ferrari E-Diff is an active diff, like the M's Variable M Differential Lock. Both trumpet them like they're the next coming, but all I can say is "Welcome to 10 Years ago".

The Prelude VTiR ATTS had an active LSD well before these two. The Ferrari and BMW one might be more advanced, but Honda released theirs in 1997 in a $50K car.

I'm pretty sure the EVO Lancers have had active diffs since the VI as well. Now I wonder how much traction a 4WD car with an active has in comparison with a 2WD car....

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You can get LSDs on FWD cars. The 80's Pulsar SSS's (post ET Turbo, pre N14) used to have viscous LSDs in the front.

They're even less common in FWD cars, since they tend to be econo runabouts that people don't buy for sporting pretensions, but they're out there.

All the Honda Type-R's run LSDs. A lot of the journos lament that the new Type-S has lost the LSD, which means they can't punch out of corners with as much traction as they used to.

The FTO runs an LSD. The RalliArt Magna actually uses it in its application, which at least lets you know the FTO LSD will handle a major increase in torque.

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The FTO runs an LSD. The RalliArt Magna actually uses it in its application, which at least lets you know the FTO LSD will handle a major increase in torque.

Only on the Version R or Limited Edition (Yellow) GPX FTOs :D

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