BLKOHZ06

I will be installing some Toyo RA1's on my street driven/track events for fun 02 Z06. My wheels are Fikse Profil 10's. Wheels are Fikse Profil 10's
Front wheels are 18x9.5 with 275/35/18 RA1's
Rear wheels are 18x11 with 305/35/18 RA1's
Suspension is stock,lowerd on stock bolts.
I want an alignment that will help keep these tires wearing evenly and give me the best handling with my set up. This is not a daily driver.
Also tire pressure suggestions for this type of tire. Thanks in advance !

Alludc

Below is a general guide that Pfadt Racing provides:
Pfadt Corvette Alignment Recommendations
These settings are a guide based on the experience and testing of Pfadt Race Engineering. Toe specs listed in inches are intended to be measured using a toe plate with approximately 21-5/8" between notches for tape measures. Negative toe measurements indicate toe-in.
Performance Street
Performance Street - Track Use with Street Tires
Performance Street - Track Use with Race Tires
Dedicated Track Car - DOT Tires, poly bushings
Dedicated Track Car - DOT Tires, Spherical Bearings
Dedicated Track Car - Race Slicks, Spherical Bearings
Front
min
-0.7 7.5 -1/16" (0.17°)
-0.4 -1/16" (0.17°)
max
-0.9 8.5 0 (0°)
-0.6 0 (0°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings will provide good performance and good tire wear
Front
min
-1.1 7.5 -1/16" (0.17°)
-0.7 -1/8" (0.33°)
max
-1.3 8.5 0 (0°)
-0.9 -1/16" (0.17°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings will provide good all around performance. The tires will wear the inside edges in street use and the outside edges on the race track. This is a good dual purpose alignment.
Front
min
-1.6 7.5 -1/16" (0.17°)
-0.9 -1/8" (0.33°)
max
-1.8 8.5 0 (0°)
-1.1 -1/16" (0.17°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings will provide great track performance. The tires will wear the inside edges in street use, and the car may tend to grab the lanes of the road. Race tires will wear well at the track and provide high levels of grip. This alignment is compromised towards track use.
Front
min
-2.8 6.5 -1/16" (0.17°)
-1.5 -1/8" (0.33°)
max
-3.0 7.5 0 (0°)
-1.7 -1/16" (0.17°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings are a good starting point for a car with polyurethane or stock control arm bushings. This alignment requires DOT race tires to function appropriately. This is a starting point only, testing and monitoring tire temperatures and pressures are required to optimize any setup.
Front
min
-2.4 6.5 -1/16" (0.17°)
-1.2 -3/16" (0.50°)
max
-2.6 7.5 0 (0°)
-1.4 -1/8" (0.33°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings are a good starting point for a car with mono-ball or spherical control arm bushings. This alignment requires DOT race tires to function appropriately. This is a starting point only, testing and monitoring tire temperatures and pressures are required to optimize any setup.
Front
min
-3.0 6.5 -1/16" (0.17°)
-2.0 -3/16" (0.50°)
max
-3.2 7.5 0 (0°)
-2.3 -1/8" (0.33°)
Rear
Camber (deg) Caster (deg) Total Toe
Camber (deg) Total Toe
Notes
These settings are a good starting point for a car with mono-ball or spherical control arm bushings. This alignment is designed and tested with race slicks, not DOT tires. This is a starting point only, testing and monitoring tire temperatures and pressures are required to optimize any setup.

BLKOHZ06

Thanks !

travisnd

Front
Camber: -1.2
Caster: +6 or more
Toe: 0

Rear
Camber: -0.9
Toe: 1/16" toe-in per side (1/8" sum toe)

Ran these for years when I had a dual-purpose C5Z. As for tire pressures w/ RA-1s. You want them 38-40 psi hot. I'd start around 33 front and 31 rear and check from there. How much they come up in temp depends on the weather/track conditions.

Enjoy

Pfadt Racing

You might want to give our alignment recommendations a try. Thanks for posting that Alludc, It's a little easier to see in this form. Click the link to get to our site with the full image so we don't break the forum tables here:

steve J06

Thanks for the link to the Pfadt info.

I see that recommended caster is actaully less on the race end of the spectrum. I've gone toward using as little caster as possible ~ 7* while maintaining camber of -1.1+* on my C6 which sees only a few track days but lots of agro street use. I've found that the steering feels less 'leaden' / more responsive with less caster, almost like toe out but without the darty tendency. This makes sense mechanistically but wanted to know what others experience was and why some are claiming max caster as better setup. Maybe there's something I'm missing that become readily apparent over the 100 MPH I can comfortably reach on the street?

Steve

joenationwide

Vette alignment specs are interesting.
I am used to E36 and E46 M3s, and we run the same caster and toe settings,
but for camber we run around -2 to -2.5 deg front and -1.5 to -2 deg rear for aggressive street.
and around -3.5 deg front and -2.0 to -2.5 rear for track.

I guess its because Vettes have much wider tires, wider track, and a better camber curve.
Can't wait to get my Z06!

Pfadt Racing

Aside from the pretty aggressive negative camber curve of the corvette it's self there is also dynamic camber gain due to bushing deflection built into the system. That's another reason we dial in more aggressive static camber settings with Poly bushings and spherical bearings which will deflect less than the stock rubber bushings.

longdaddy

if you are not driving daily, get a real track alignment and flip the tires inside out once you see pronounced wear on either edge. I believe you can do this with RA1s.

I tried it with R888s, 555RIIs, various Hoosiers and it worked every time.

you will get a lot of advice on specific tire pressures here, most of it not applicable to your circumstances or just plain bad. find what works for you. going by how the car "feels" is a pretty reliable method - assuming you are OK experimenting with it. Of course, if you feel like geeking out between sessions with a pyrometer and endless sheets of paper filled with pressure/alignment/temp numbers, that is an option as well.

JETninja

On C5's you don't really want to exceed much above 7.5 degrees of Castor, at 8 and above the PS pump will start smoking from what I've heard.

mashinter

Maybe because more caster results in more negative camber in turn?

acrace

Mashinter - that's how I set up my autocross cars, given that typical autocross courses usually have some tight corners where there's a lot of steering angle - and that's where more caster helps (more negative camber).

If I wasn't autocrossing, I wouldn't go max positive caster - probably midrange per the factory specs.

doveboat

Where are you able to find 305/35/18's ?

The Toyo site does not show that size.

Thanks, Ed