Best affordable LSD for a 2.5 5spd ???
 

I'm shopping for an affordable LSD for my 99 2.5 liter 5 speed AX, hillclimb and occasional DE car. I want to setup more in favor for AX and hillclimb.

Whats out there in terms of decent LSD for the older 5 speed cars? Usually I can find parts by using google but I'm coming up short.

I spoke with Stasis but apparently they only made a limited run of LSD's for this car and dont have anymore.

Jake sells them.

http://www.flat6innovations.com/shop/home.php?cat=287

We are having some othgers made that aren't as expensive, but are a tad heavier...

Is there a reason for no 2.7L version of the LSD? Not looking to buy; just wondering.

I'm wondering the same? I've have been seriously considering a LSD. I didn't realize that they would be different for a base vs. a "S" model.

Have you seen the Quaife LSD for 2.5L?

http://www.quaife.co.uk/Porsche-Boxster-2-5-litre-96-98-ATB-differential
http://www.patrickmotorsports.com/part/632/

I would go with the Guard. They offer both true LSD and TBD (Torque Biasing, like a Quaife but better quality, and oddly enough, cheaper). I'm planning a true LSD into my 6-speed when my 3.6 goes in the car.

The Quaife is not an LSD, it is a TBD (Torque Biasing Diff). For most of us, who spend our time on the street, a TBD is a better option than an LSD.

Ok, I'd like to hear the differences between the LSD and TBD. Pros and cons.

True LSDs provide lockup on both acceleration AND deceleration, irrespective if both wheels have traction or not. TBDs prove lockup on a progressive basis on acceleration only, and only if both wheels have at least some traction.

If you put a car on a hill, with, let's say the right side of the car on ice, and the left side of the car on nice, warm, grippy, heated pavement and try to climb the hill, the car with the LSD will go up it just fine. The car with the TBD will not move.

The lockup of an LSD on decel is helpful in stabilizing the car while braking into a fast corner, but the real advantage of the LSD is that if the car lifts a drive wheel while cornering, it will not lose power delivery. LSDs can also be tuned to determine the amount of lockup that will occur, on both accel and decel. TBDs just can't offer this.

The downside to an LSD is that you get lockup when you sometimes don't want it. This can cause understeer in slow, tight corners (this is why autocross guys prefer TBDs). Also, LSDs will require more maintenance than a TBD, since the clutch packs do wear.

Generally speaking, for street or autocross applications, the TBD is the better choice. For a track car, esp a higher powered one, the LSD is the winner. For most of us here, the TBD is the better option. The only thing to think about is that for those that do drive their cars in the winter, the LSD will provide much better traction due to the reasons mentioned above.

Hope that helps.

Perfect. Thanks for the comparison.