chadillac2820
10+ Year Contributor
- 279
- 3
- Mar 2, 2012
-
newnan,
Georgia
What fwd lsd are you guys running? Pros and cons? Most importantly, price?
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If you going awd don't bother but it's a must have for fwd ( the quaife) the cheaper inserts don't work as well ( search LSD inserts for more info)
I only know of 4 types of LSDs that are popular. There's the typical insert type like the RipGrip which are known to be weak but they're cheap.
Kaaz and Quaifes are torque based and are of clutch and helical gears design respectively.
The newest one to the market is the Wavetrac which is also of a gear design but consist of wave discs in the center to eliminate zero-axle load conditions. Read more here: Wavetrac® Differential - A torque biasing differential with a difference
Quaife's are great for DD, road racing, and autocross since they consist of turns but their slow to lock design is terrible for drag. If you want to drag race, go with a Kaaz. Not to say Kaaz isn't DD-able. It just takes getting used to and is more noticeable. Any car can benefit from an LSD, especially FWD. AWD can still spin one side or the other if you make enough power to do so. In turns, you can eliminate power-on understeer with a Quaife. Read more here: http://farnorthracing.com/tech_quaife.html
Kaaz and Quaifes are torque based and are of clutch and helical gears design respectively.
Like most things, you get what you pay for. Want a "real" LSD, it will cost you. An insert may help (have read mixed reviews) but you still have a weak stock diff, which can easily explode with some wheel hop.
I use to run a Quaife when I was fwd. Its expensive, but it was defently worth it as. Though I would take the awd "mod" over a real LSD in a fwd anyday.
Great post by CrimsonDragon. One quibble:
While the above is true, the way that torque makes these lock is very different. A Kaaz, being a modified clutch-pack, locks as a function of total transmitted torque. A Quaife, being a T2 helical, locks as a function of the difference in torque that is being transmitted to the two outputs. This is why a Quaife is better for anything involving turning, while a Kaaz is better for going straight ahead. The Quaife doesn't lock until right before you need it to lock. The Kaaz is locked long in advance.
If you haven't already: http://www.dsmtuners.com/forums/drivetrain-tech/251295-diffs-lsds.html