dand86951

In trying to decide to get a LSD for my 86 951 the option of going with the Quaife torsen differential came up and it seems to be a pretty good piece of equipment. Does anyone have comments about using the Quaife vs getting a transaxle with the factory LSD?

My usage is for the occassional DE and track day and for some long track autocrosses we have in addition to the street.
Thanks in advance for the input. <img src="confused.gif" border="0">

yoyoguy2

i have heard that the quality of quaife units is excellent, though i don't have one.

GrantG

Quaifes are not LSD's - they're torque-biasing diffs - at least that's what I've heard. What this means is that the axle locks under acceleration and impending slippage between driven wheels (limiting the spinning of just one tire), but acts like an open diff under braking or coasting. I'm not sure which is better for a given application, but they are different. An LSD is always locked, unless there's sufficient torque differential to unlock it.

Tom Pultz

I have the torque sensing unit made by Guard Transmission and have been very happy with it. I think it's better quality than the Quaife. Guard also makes a billet LSD that is very strong, but more expensive.

For occasional track work the factory LSD would be better than the torque sensing units because it provides some lock under braking, but they are not very strong and the cases can crack.

For a car that sees mostly street and some autox I'd probably opt for one of the torque sensing units because they do not promote understeer like an LSD would, and they also don't require periodic rebuilding due to worn clutch plates.