kyrocks

My GT3 is at the dealer waiting for the coolant pipe to come in (burst coolant line at 2200 miles - will post more info later this week) so I thought I would get a more aggressive alignment done for the track. I plan to use the car for 80% track, 20% road. I will have a trailer. I've read the threads on alignment here and coupled with my previous experience, I would like alignment settings as follows (using Pirelli Corsas, or MPSC):

Front: -2.5 camber, 0 toe, 8 caster
Rear: -2.0 camber, 0.15-0.2 toe in per side (0.3-0.4 total)

They said that they usually like more negative camber in the rear and usually set it at a more negative value than the front.

What do you guys think of this? I know I could get a little more negative camber in the rear, but more than the front? I also don't want to wear the inside of the tires too much in the rear.

Thoughts? Thanks.

TRAKCAR

I rate the grip of the MPSC about the same as I run my Toyo RA1.

I run just like you, even less camber rear -1.7 but that may be due to RS.
zero toe in front
2mm toe in per side rear.

I think you're good with what you asked for.

va122

That's crazy, you want MORE -camber in front. Always.

kyrocks

That's what I thought, but I really didn't want to argue with them. I think I'm going to stick with my numbers.

NJcroc

Your dealer is most likely thinking of regular stock porsche cars. On these you cant achieve enough camber in the front and they run alot more in the rear. the stock settings are almost double in the rear , as they have trouble getting much more than 1 degree up front

Viperbob1

Ever since the 2 landmark 930 lawsuits in the '80s, Porsche has been OVERLY aggressive in tuning the rear. To that end they also have WAY too much toe in on Rear.

tcsracing1

Find yourself a shop that actually runs cup cars.

kyrocks

Not possible in Iowa or Nebraska! Moving to Dallas this July, though...

LehmanZ06

My opinion......go between 2.25 and 2.5 in rear.

With a smaller amount in the rear I wonder if the might oversteer a little more in mid corner.

mdrums

+1 Bob is so correct! I run no more than .14 degrees per side rear toe.

More camber in front than rear. I've been told to keep front to rear around .5 degee of each other. so 2.5 front and 2 rear is fine.

Bob...camber settings?????

996FLT6

Do 7gt3's require less camber then 6gt3's due to better suspension geometry? At 2.5 and 2 rear it's not enuf on track. I find I'm fighting it ^all the time. When I rotated struts plus shims and over 3 it is awesome at the track. Regards. Mike

nash

When you move to Dallas send me a PM and we'll hit the track together. Lots of good shops here to take care of your car(s), too!

Bob Rouleau

On my 7 GT3 I ran 2.4 neg in the back and corded the inside edge. Went 2.2 in back and tire wear was even with 12 degrees F temp spread across the tread. This may vary depending on the tracks you drive however. This was with Hoosier R6 tires FWIW.

FTS

Such differing experiences, I'll put my 2 cents:

Just before last weekend, I got a re-alignment: -2.4 f, 0 toe f, -2.5 r, 0.44 r total toe r. Running 888s. 31-33 psi hot pressures.

No understeer to very mild. No oversteer, unless exagerated with throttle. When I checked the tire after event, I could go lower on front pressures, but rears rolled slightly, otherwise very even wear.

997gt3north

There is no question the car will work perfectly with this alignment but I think you may find that with the R888s specifically with their very stiff sidewalls, once tire wear becomes evident, your inner rears will be the first to go - possibly significantly faster than the outsides. That said, the R888s will almost certainly heat cycle out in the rear before they cord - ie you will find yourself counter steering on turns to save your bacon - be careful of this - it can and will sneak up on you quickly.