LiveNupe

With regular track use, I’m being told that I should expect the front tires to wear twice as quickly as the rears. I’ve only gone through 1 set of tires and this is consistent with my experience so far. I’m an intermediate driver with about 8-10 track days on this car so I’m still getting used to the car while developing driving skills. In my novice thinking, I was wondering if the accelerated front tire wear is indicative of excessive under steer. While I’ve noticed that the car is pushing in a few corners, I’ve also noticed that the car is loose in others. Side note, the front and rear sway bars are set in the middle position. A few questions:
1) For those of you who track your cars, is that consistent with your experience?
2) Can anything be done with the sway bar settings, tire pressures, etc to balance the wear?
3) Should I just accept the unbalanced front/rear wear and “get over it”?
4) Other thoughts?

GrantG

Are you wearing the fronts evenly across their treads? If not, maybe a different alignment could help (what are your settings?). My wear is fairly even front/rear.

LiveNupe

yes, the wear is fairly even across the front and rear tires

GrantG

Have you changed alignment or still on factory alignment? If changed, can you post specs?

LiveNupe

I just had the car aligned last week. The before/after specs are as follows:

Front Left
Camber -2.68/-3.14
Caster 7.84/7.84
Toe -2.2mm/-1.0mm
SAI 16.15/16.60
Included Angle 13.47/13.47

Front Right:
Camber -2.51/-3.13
Caster 7.89/7.89
Toe -2.2mm/-1.0mm
SAI 16.28/16.89
Included Angle 13.77/13.77

Front
Cross Camber -0.17/-0.01
Cross Caster -0.05/-0.05
Cross SAI -0.13/-0.29
Total Toe -3.7mm/-2.1mm

Rear Left:
Camber -2.47/-2.80
Toe 0.4mm/2.2mm

Rear Right:
Camber -2.18/-2.78
Toe 2.5mm/2.3mm

Rear
Cross Camber -0.30/-0.03
Total Toe 2.9mm/4.5mm
Thrust Angle -0.09/0.00

edub

Whats up with your rear left toe (before)? Did you smack something?

GrantG

So, usually negative toe numbers mean toe out and that is very aggressive on the front axle (can make it nervous on the road), but I wonder if maybe that’s partly responsible for your front tire wear. The factory track recommendation is slightly toed in (and you have quite a bit of camber as well):

LiveNupe

I haven't hit anything other than curbing at the track.

LiveNupe

Is there a consensus on the “ideal” sway bar settings for the 992 GT3 for track use?

GrantG

I’ve been totally happy with middle settings on both bars (on previous GT cars, I always set bars for more oversteer on 991.2 and 981)

disden

Tire wear is highly dependent upon how hard you are driving the car, and the track itself. Some tracks destroy tires, others are not as much. With all the camber, bar adjustments in the world I have never gotten perfectly even wear as the track itself dictates wear. Some places I can get a weekend out of a new set of Cup 2s, other tracks I can get 2-3 weekends out of them if I rotate them between days. The down side of getting faster is that money spent on consumables like tires, rotors and pads start to add up quickly!