LSD recommendations, LSD reccomendations Options

[Charles Freeborn]

Greetings.
While my engine is out for top end refresh I'm also planning on installing a limited slip diff.
What have people run and why? Obvious choices are Guard (true LSD) Quaif, Wavetrac (Torque bias). Pros / cons of those types? I've heard the TB is easier on the rest of the gearbox. Not too concerned about having to run LSD additive as the fluids get regular service anyway (every event).
Quick rundown of the car:
100% track use (not street legal) Little to no AX - all road course.
2.0L 4 cyl with fairly extensive mods. Estimated hp around 150.
901 side shift with AFKSX gearsets.
Car weighs approx 1700 lbs (18 & change with me in it)
Currently running Toyo RR 225/50 slicks. May step up to Hoosiers if I get more serious about racing. I've got another set of wheels for running in the wet with R888R's. Not great rain tires, but that's what's on those wheels now. When they're done I'll probably switch to RA1's.

Thanks!

[wndsrfr]

I just put in a Guard for my /6 track car--all road course like you're doing.
The AFKaSX is a great choice although you may run out of revs on really long straights with high speed entry...I'm on AFNSZ with 215RWHP but am about 1940lb dry.
I've been on RR's in the past and now Hoosiers as required by SVRA, etc. RR's are actually faster I think--less rolling resistance but find the Hoosiers are nice at the limit, lots of slip with same cornering force, don't suddenly break away.
That said, neither of us are going to break away the rear end in any of the higher gears with a limited slip in there but there's some discussion about how the Guard helps on braking but I'm fuzzy on that count....

[Charles Freeborn]

I just put in a Guard for my /6 track car--all road course like you're doing.
The AFKaSX is a great choice although you may run out of revs on really long straights with high speed entry...I'm on AFNSZ with 215RWHP but am about 1940lb dry.
I've been on RR's in the past and now Hoosiers as required by SVRA, etc. RR's are actually faster I think--less rolling resistance but find the Hoosiers are nice at the limit, lots of slip with same cornering force, don't suddenly break away.
That said, neither of us are going to break away the rear end in any of the higher gears with a limited slip in there but there's some discussion about how the Guard helps on braking but I'm fuzzy on that count....

Yep, runs up against the rev limiter about half way through a long straight. Fortunately 2 of the 3 tracks I run the most are pretty "technical" and straightaway speed is less of an issue. My car is a 4, with way less hp, so breaking loose the rear is less of an issue.

Haven't run Hoosiers yet ($$!!) so can't say. The RR's feel good - especially once their warmed up.

The "tail wag" phenomenon with 911's is a real thing. I've set mine swinging before and it's a pucker inducing feeling.... essentially when lifting off the the throttle from high speed in a straight line the diff is dancing back and forth to whichever wheel is on the "inside" this gets the trailing throttle oversteer excited. When said wheel hooks up it makes the rear dance to the other side and the oscillation occurs. Only recourse is to get back on the throttle.... as with most 911 handling quirks..