[Z06] Need some help with allignment specs, thanks.
Thread Starter
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
Need some help with allignment specs, thanks.
Car is primarily street driven so I can't be wearing out the inside edges of my tires every 5000 miles. I run 3-5 HPDE's a year, maybe 1-2 more next year. I haven't had the car properly allighned after lowering it and want to get it done perfeclty. I'll be taking the car over to Eurosport here in Va Beach (they run GT3 cup Porsches) to get it done... Need some specs for them. Should I use stock specs or go a bit more agressive?
Thanks,
Brian
Thanks,
Brian
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Brian,
There is no perfect alignment for track and street. Everything is a trade off.
The more front negative camber you have the less understeer and better turn in you will get... at the sacrifice of tire wear.
A compromise is something like:
Front
Camber: -1.3
Caster: max but matched side to side
Toe: zero to very slightly toe out (like maybe 1/16")
Rear
Camber: -1.0
Toe: slightly toe in (1.8" total or so)
As a data point, just after I bought the car, I had the front camber increased to -1.75 degree with zero toe when I lowered it. I wore out the inside edge of the stock front F1 SCs in 3k miles and 2 DE days. They were followed by a set of Kumho Ecsta MX which lasted 10k miles on the same alignment, but with only one DE day.
There is no perfect alignment for track and street. Everything is a trade off.
The more front negative camber you have the less understeer and better turn in you will get... at the sacrifice of tire wear.
A compromise is something like:
Front
Camber: -1.3
Caster: max but matched side to side
Toe: zero to very slightly toe out (like maybe 1/16")
Rear
Camber: -1.0
Toe: slightly toe in (1.8" total or so)
As a data point, just after I bought the car, I had the front camber increased to -1.75 degree with zero toe when I lowered it. I wore out the inside edge of the stock front F1 SCs in 3k miles and 2 DE days. They were followed by a set of Kumho Ecsta MX which lasted 10k miles on the same alignment, but with only one DE day.
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Burning Brakes
Joined: Aug 2003
Posts: 1,141
Likes: 0
From: Huntington IN
Can't argue with those specs, but you will see some tire wear being that high up in the spec ranges if you do a bunch of street driving. Might be ok for a weekend driver, buy they won't last long on a daily basis.
Like Subdriver said, "everything is a trade off".
Like Subdriver said, "everything is a trade off".
Thread Starter
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
That's exactly what the guys on Z06vette told me... 1.3 camber, caster maxed out, neutral toe to a hair out. Then 1 in the back camber and a hair toed in. I think that's what I'll go with.
Advanced
Joined: Feb 2004
Posts: 82
Likes: 0
From: HUNTINGTON BEACH CA
I am -1.5 camber in the front and -1.0 in the rear with 8 DEs and my outsides are about to chord (cord?) with <8000 on the clock and stock Goodyears.
Just more data to compile. Use it as you wish.
Good luck.
Just more data to compile. Use it as you wish.
Good luck.
Instructor
Joined: Aug 2004
Posts: 221
Likes: 3
From: Flower Mound Texas
I tell you what, if you have it aligned to regular C5 specs, you will hate it.
It sounds ridiculous, but I let the service writer talk me into doing an alignment at 15,000 miles, and they just aligned it like a regular Vette. I had to drive it home and back first thing in the morning and they realigned it. It felt weird.
Jeeeeeeeeeeze what a difference. It was like it was broken...
It sounds ridiculous, but I let the service writer talk me into doing an alignment at 15,000 miles, and they just aligned it like a regular Vette. I had to drive it home and back first thing in the morning and they realigned it. It felt weird.
Jeeeeeeeeeeze what a difference. It was like it was broken...
Burning Brakes
Joined: Jun 2004
Posts: 1,184
Likes: 3
From: KADS- If it has wings or an engine, I can break it. Dallas TX
I thought for the sake of high speed stability that you would want + postive toe, or toe-in on the front. +.04 degrees front individual, +.08 total toe front.
How much caster? 6.9 degrees or do you go with more.
I agree with -1.3 front camber and -1.0 rear.
Is the steering wheel straight on you guys car? The reason i ask, the steering wheel was cocked about a .5 degree to left on my car. So i took it to chevy and said fix the cocked steering wheel. I pick it up and the car drives straight but now the steering wheel is cocked about .75 degree to the right. The serivice manual said the steering wheel angle is +/- 1.0 degree service tolerance. The cocked steering wheel bothers the crap out of me. So I have an appointment for another alingnment on Thursday.............. Do most of the C5 vettes have a slightly cocked wheel when driving straight? Am I trying to split hairs???
The car seemed to drive better before they alingned it.
Thanks, Robert Lewis
2004 SCCA Solo2 Regional Champion
How much caster? 6.9 degrees or do you go with more.
I agree with -1.3 front camber and -1.0 rear.
Is the steering wheel straight on you guys car? The reason i ask, the steering wheel was cocked about a .5 degree to left on my car. So i took it to chevy and said fix the cocked steering wheel. I pick it up and the car drives straight but now the steering wheel is cocked about .75 degree to the right. The serivice manual said the steering wheel angle is +/- 1.0 degree service tolerance. The cocked steering wheel bothers the crap out of me. So I have an appointment for another alingnment on Thursday.............. Do most of the C5 vettes have a slightly cocked wheel when driving straight? Am I trying to split hairs???
The car seemed to drive better before they alingned it.
Thanks, Robert Lewis
2004 SCCA Solo2 Regional Champion
Last edited by 2K3Z06; Nov 10, 2004 at 12:08 AM.
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