TTT

Wanting to see if anyone else has some suggestions.....

 

Anyone have an recent alignment done yet. Looking for some input. I would like to keep this thread going and do a quick summery after all the info has been gathered.

 

Are these the alignment specs, especially the optimals, for Z06s of all years?

LEFT & RIGHT FRONT
Camber: Specified Range: -1.2 to -0.2 Optimal: -0.7
Caster: Specified Range: 6.4 to 7.4 Optimal 6.9
Toe: Specified Range: 0.15 to 0.25 Optimal 0.20

FRONT
Cross Camber: Specified Range: -0.5 to 0.5 Optimal: 0.0
Cross Caster: Specified Range: -0.5 to 0.5 Optimal: 0.0
Total Toe: Specified Range: 0.30 to 0.50 Optimal: 0.40

LEFT & RIGHT REAR
Camber: Specified Range: -1.2 to -0.2 Optimal: -0.7
Toe: Specified Range: -0.06 to 0.05 Optimal: -0.005

REAR
Total Toe: Specified Range: -0.11 to 0.09 Optimal: -0.01
Thrust Angle: Specified Range: -0.10 to 0.10 Optimal: 0.00

************************************

Do these specs correctly represent the optimals given for the following GM high performance recommendation?

"For more aggressive track/street use, increase front individual camber to 1.0 degrees, and rear individual camber to .8 degrees, while reducing front toe to .06 degrees, and rear toe to the minimum (.01 degrees). This is a very drivable setup and increases mechanical grip noticably."

Is that .01 rear toe a negative or positive? Is this for total toe or individuals?

LEFT & RIGHT FRONT
Camber: -1.0
Caster: 6.9
Toe: 0.03

FRONT
Cross Camber: 0.0
Cross Caster: 0.0
Total Toe: 0.06

LEFT & RIGHT REAR
Camber: -0.8
Toe: -0.005

REAR
Total Toe: -0.01
Thrust Angle: 0.00

 

Why do you have the castor different for the individual fronts?

 

For spirited driving and regular use, ditch the runfalts and use the standard Z06 set up. The alignment shops will not ahve problems in setting you up and you will minimize outer tread wear. Other, more agressive, settings will cause tire wear problems if you do a lot of street driving. GM spent a lot of time and effort in developing the Z06 numbers and went through a lot of compromises. With standard C5 wheels you will experience less outer tire wear that a Z06 and that will give you longer tire use. IMHO. Also, your front to back rake (fender well Height) should be 1/2 to 1 in difference with the back end higher. This is especially true when you get into triple digit speeds.

 

I just measured the height difference from the ground to the highest point of the wheel well (stock 02 Z06, not lowered). The results are 27 5/8" front and 28 5/8" rear. The 1" difference looks like the spec from the factory.

 

Can anyone answer my questions on those specs I listed?

 

I guess the person that listed those quotes will need to answer your questions. I looked to see if they were my quotes but they are not. I would like the input also.

 

Can I make a suggestion?
You have been at this since last November. No one set of alignment specs is going to be perfect. Pick a set and go with it. See how it feels. If you want to be that precise you are going to have to go at it a few times anyway. What I showed on the graphic above worked for me. The standard Z06 spec works quite well for most applications. Pick something and give it a try.

 

Fair enough comment, but I want to try those high performance settings that GM stated and I want to make sure I can communicate them properly. Hence, I need someone to answer my questions (especially the rear toe sign and whether it is individual or total).

 

Here is a summery for everyone for now.
I hope this info can be useful for the people thinking of having their car aligned.
If you use this info, please post your thoughts....would like to hear your feedback.


Factory C5 Alignment Specs

Here is a 2000 C5 Alignment spec right out of my service manual that I just received.
I hope some people may be able to find this info helpful.

Preferred Settings............

Front Individual Toe +0.04 degree

Front Sum Toe +0.08 degree

Steering Wheel Angle 0.0 degree

Front Individual Caster +6.9 degree

Front Cross Caster within 0.50 degree

Front Individual Camber -0.20 degree

Front Cross Camber within 0.50 degree

Rear Individual Toe -0.01 degree

Rear Sum Toe -0.02 degree

Rear Thrust Angle 0.0 degree

Rear Individual Camber -0.18 degree

Rear Cross Camber within 0.50 degree




Mild Alignment Specs

With all that in mind...........
While comparing Z06 Alignment specs,
here is what I come up with for a little better handling ride.
Not having a problem with tire wearing issues.

Front Individual Toe +0.04 degree

Front Sum Toe +0.08 degree

Steering Wheel Angle 0.0 degree

Front Individual Caster +6.9 degree

Front Cross Caster within 0.50 degree

Front Individual Camber -0.70 degree

Front Cross Camber within 0.50 degree

Rear Individual Toe -0.01 degree

Rear Sum Toe -0.02 degree

Rear Thrust Angle 0.0 degree

Rear Individual Camber -0.68 degree

Rear Cross Camber within 0.50 degree



Mildly Aggressive Alignment Spec's

Or go a little more aggressive............
Maybe a little more tire wear but not very noticeable.....
This is still within Z06 spec's I believe but not within C5 spec's.
My 2000 C5 does have the Z51 suspension package though.
Still would like more input from you, the pros..........

Front Individual Toe +0.03 degree

Front Sum Toe +0.06 degree

Steering Wheel Angle 0.0 degree

Front Individual Caster +6.9 degree

Front Cross Caster within 0.50 degree

Front Individual Camber -1.0 degree

Front Cross Camber within 0.50 degree

Rear Individual Toe 0.0 degree

Rear Sum Toe 0.0 degree

Rear Thrust Angle 0.0 degree

Rear Individual Camber -0.80 degree

Rear Cross Camber within 0.50 degree

 

I installed Z06 bars and Bilsteins a week ago and had the alignment set to specs provided by Subdriver on this forum. I went to a shop that has state-of-art and fresh equipment. They do a lot of performance cars in our area and some of the people their are road racers. They spent the time to make sure the adjustment was dead-nuts on. Below are the specs. I extremey happy with the setup.

"Be careful what you ask for though...

For example, the stock Z06 camber is -0.7 +/- 0.5 meaning anything from -0.2 to -1.2 is technically within Z06 spec.

I would be very specific as to what you want. A dealer should be able to get it pretty close to -0.7 front.

Here is a suggestion for you for a mild street setup (should be within Z06 specs):
Front
Camber: -0.7 (matched side to side within 0.1)
Caster: Max positive, matched side to side (should be around 6.5 or so)
Toe: zero to very slightly out (like 0.1 degree out total)
Rear
Camber: -0.5 (matched side to side within 0.1)
Toe: zero

If you want better handling while sacrificing a little tire wear, increase front camber to -1.0, which is still within Z06 "spec".

Good luck!

 

Great info. Thanks for posting.

 

Here is what I ended up with.
I finally was able to take my baby in for an alignment today. It was hard due to me working too much.
We will see how it does. Anyone PM me if they would like to know.

By the way.... Local shop did it for $100.00
They spent some time on it to get it pretty close.

Between Mild & Mildly Aggressive.



Front Individual Toe +0.03 degree +0.03

Front Sum Toe +0.06 degree +0.06

Steering Wheel Angle 0.0 degree 0.0

Front Individual Caster +6.9 degree L +6.72 R +6.86 AVG = +6.79

Front Cross Caster within 0.50 degree

Front Individual Camber -1.0 degree L -0.83 R -0.79 AVG = -0.81

Front Cross Camber within 0.50 degree

Rear Individual Toe 0.0 degree L 0.0 R -0.01 AVG = -0.005

Rear Sum Toe 0.0 degree -0.01

Rear Thrust Angle 0.0 degree 0.0

Rear Individual Camber -0.80 degree L -0.68 R -0.73 AVG = -0.705

Rear Cross Camber within 0.50 degree

 

Well how does it handle?

 

So far It handles GREAT. It is definitly better than it was. I need to wait till we have some really nices days here in N CA then I will be taking a quick drive to the Lake. A true test. I am dying to go. I will post better results as soon as I am able.
Thanks for asking.

 

just got mine aligned yesterday too. went with Z06 specs but requested that he go as negative as possible, within range, on camber. took it for a quick spin around the neighborhood and it felt good. running it at buttonwillow today for a true test

ended up with:
front:
caster L 6.4 R6.4
camber L -1.12 R -1.12
toe L +.03 R +.03

rear:
camber L -.89 R -.89
toe L 0 R 0
thrust 0

 

Try this site for alignment specs:

http://www.vbandp.com/instructions/htmlinstruct/align.htm


Ron ...

 

Got the aignment on a new computerized (Hunter?) system. Very cool...you can watch the visuals as the specs are dialed in on the car.

Anyways here are my numbers:

FRONT
Camber: -0.6L -0.6R
Caster: 8.1L 7.8R
Toe: 0.03L 0.05R
Total Toe: 0.08
Steer Ahead: -0.01

REAR
Camber: -0.6L -0.6R
Toe: 0.05L 0.04R
Total Toe: 0.09
Thrust Angle 0.00

The car tracks straight excellently. Corners Great. Steering is VERY responsive.

All settings were within the computers 2001-04 Z06 parameters except for the front caster. He left these as is because they wasn't any room for further adustment. Does this make sense?? This is how it came from factory....no previous alignments. Car is lowered with Bilsteins, Z06 sways, Hotchkiss and 18x9.5 and 18x10.5 wheels.

He said the front caster setting does not affect tire wear and that he would have to try to get an aftermarket adjuster if available if we wanted to get it into spec.

The only other thing I notice is that some of the Z06 parameters you guys are listing are different on than shown on my computer printout. I will list these or try to upload an image of printout soon.

What do ya think...feels good but any input or changes that you think should be done would be aprreciated.

 

I would like to see more negative camber if you are not on runflats. Close to 1 degree if it is a mixed use car and up to 2 degrees if roadcourses are primary use. 1 degree should be standard from the factory on non runflats.