jtkeller

I've got a 2003 Z06 and just recently added Pfadt coilovers and their street sway bars. I took the car to PST @ Motorsports Ranch in Cresson, TX and had them set the suspension up for me. I AX about a dozen times a year along with a few HPDE's and put about 4k miles on the street with it.

So, I asked for a bit more aggressive alignment with this in mind and this is what they did:

Alignment:
rear axle
camber: -1.8*/-1.77* (l/r)
ind. toe: +0.03"/+0.03"
total toe: +0.06"
setback: +0.23*
geometrical driving axis: +0.00*

front axle
castor 10*: +8.26*/+8.26*
K.P.I. 10*: +11.55*/+11.71*
camber: -2.98*/-2.91*
ind. toe: -0.06"/-0.07"
total toe: -0.13"
included angle 10*: +8.56*/+8.80*

Corner balance, 230 lb driver, 1/4 tank fuel
LF: 895 RF: 851
LR: 818 RR: 768
RF to LR Cross: 50.1%
Total Rear: 47.6%

For grins they checked it with 230 lb driver and 155 lb passenger, 1/4 tank fuel
LF: 905 RF: 895
LR: 843 RR: 839
RF to LR Cross: 50.1%
Total Rear: 47.6%

Ride height set at:
LF: 3 15/16" RF: 4"
LR: 4 3/16" RR: 4 1/4"

Any comments/suggestions on additional adjustments? I'll be AX'ing the car this weekend and am looking forward to seeing how it handles.

Ben Diss

That's a lot of camber. What tires are you running? Also, did you ask for toe out up front for AX?

davidfarmer

that really is a lot of camber in the front, more than I found usefull even in my dedicated race cars. Crossweights are as good as you can get, as the fuel moves around and gives you a margin of error that is higher than any corrections you could make at this point.

jtkeller

I'm running Nitto R2's on the street, but only drive about 4k miles per year. On the track, I'm running 18x10.5 Z06 rears with Hoosier 305x30x18's at all 4 corners. I told them the type of racing I'm currently doing and that's where they set it. We'll see this weekend how it handles at the AX. Do you think the camber is too agressive???

C6400hp

Seems like way too much camber for a street car.
AJ at PST is a good guy.
That mcuh camber *might* be useful on Hoosiers.

jtkeller

I'll be keeping an eye on tire wear, I don't drive that much on the street and am willing to sacrafice some wear for better performance.

ghoffman

Too much rear camber, 1.4 is about the max no matter what tires. It will be easy to tell if it is too much, because your straight line grip will suffer. If this turns ot to be the case for you, then back it down.

kentz06

So how much camber is too much for a car primarily set up for HPDE and driven hard?

Current settings for my '07 C6 Z06:
Hoosier R6 295/30-18 & 335/30-18.
Moton Coil-Overs.
Lowered approximately 1" all around.
Corner balanced within 0.3% all around.

Front:
-2.0 Degree Camber.
7.6 Degree Caster.
0 Toe.

Rear:
-1.0 Degree Camber.
0.18 Degree Toe-Out.

I was contemplating more camber for my next session this Friday!?

What about a little toe-out for the front?

Dean

ghoffman

What tires are you running? What spring rates are you running on the Motons? I have Penskes, and one click on the compression setting in the RF made a huge difference last month at NHIS.The initial settings look pretty close to what I would recommend, but you will have to be the end game. Only you and your tires will be the ultimate decision makers.

kentz06

Hoosier R6 tires.
700# springs front.
600# springs rear.
200 psi gas front.
175 psi gas rear.
Rebound damping: click 3 of 7 all around.
Compression damping: have tried 2-5 in front, 2-6 in rear. The car felt better when using the stiffer settings, but what do I know??? I don't want to be the decider!!!!

Thanks!

Dean

ghoffman

Sorry, but you have to be the final decision maker. I would however, suggest that you at least run the same pressure in the shocks and adjust accordingly. The pressure really should not be a tuning tool. In general, alway try softer first to correct a problem, if it is the wrong direction, you will know.

TedDBere

Ummm, never run toe out in the rear of a Corvette unless you want to drift the car.

Perhaps you mean toe-in.