which lsd to buy?
 

Im installing soon my aasco lw flywheel and LN ims bearing, while im there, i might install a lsd.

this is a track only car.

a 2004 boxster S, all stripped, ready to race.

is there any other product than guard lsd for track only car?

thanks

Quaife is the only other one I know of

Porsche Quaife ATB Helical LSD Differential, 6 Speed

I don't run one but most of the serious, front running track guys I know use Guard.
Limited Slip Differentials | Guard Transmission

Matt Monson is one of the best and he really understands driver needs.

I've got a Guard torque-biasing diff. No issues, works great for AX. It was a bit pricey, but hey, that's the way it is.

how much did it cost you for the part?

i do my own labor with a friend, not much here

I use a Wavetrac type differential:

Wavetrac® Differential - A torque biasing differential with a difference

This is basically a Quaife type ATB differential with Salisbury type thrust ramps built in to allow the differential to work to some extent when the inside wheel is unloaded.

With a Quaife or Guard ATB differential, as the inside tire load drops down below 20%, the differential looses effectiveness and starts to act like an open diff. The Wavetrac tries to compensate for this.

There is a video on the internet somewhere of a guy with one of these on a BMW, where he jacks up one of the rear wheels and is able to drive off in a fashion with one wheel up in the air.

I know from photos of my car on both race tracks and auto-x, the inside rear is indeed very lightly loaded at maximum G's on r-comps, and I have my suspension tuned to minimize rear weight transfer.

So it is a real concern if you are pushing the limit.