front & rear toe in???
Thread Starter
Le Mans Master
Joined: Jan 2004
Posts: 8,295
Likes: 30
From: one night in Bangkok you are never lonely
front & rear toe in???
I have read some time back that our C3s need a slight toe in front and rear to run straight at high speeds. If this is correct how much is a little?
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I'm running 1/16" toe-in front and 1/4" toe-in in the rear. Handles great and drives nice all the way up to 125 mph. I'm sure the rear toe-in is going to hurt tire wear, but my car doesn't see that many miles.
For a street only car, I'd probably keep the rear toe-in at 1/8" for better tire wear.
I'll be curious as to what others are running.
For a street only car, I'd probably keep the rear toe-in at 1/8" for better tire wear.
I'll be curious as to what others are running.
Melting Slicks
Joined: Jan 2004
Posts: 3,247
Likes: 210
From: Detroit MI
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
69autoXr & TheSkunkWorks,
I plotted the roll-steer for the front, but not for the rear yet. I agree that 1/4" is probably on the high side and I still need to determine the ideal toe-in setting. That's why I recommended an 1/8" ... I figured I'm not dialed in exactly yet.
I've been kind of all over the place with the rear toe-in (0", 1/2" <-- a mistake oops :o , and now 1/4") and am still trying to find the best setting. It seams well balanced with the 1/4", but you are correct about not being able to steer very well with the throttle. I think a little less toe-in would improve this at the exit of the corners. I'll admit I'm still on a steep learning curve on this stuff, but its fun anyway
.
Before I get to the track in April, I really need to do three things:
1 - Install my accusump so I won't have to worry about the oil pressure
2 - Determine the rear roll-steer and set rear toe-in based on this measurement
3 - Finish the front brake cooling ducts so they work better
How's your car coming Charlie?
I plotted the roll-steer for the front, but not for the rear yet. I agree that 1/4" is probably on the high side and I still need to determine the ideal toe-in setting. That's why I recommended an 1/8" ... I figured I'm not dialed in exactly yet.
I've been kind of all over the place with the rear toe-in (0", 1/2" <-- a mistake oops :o , and now 1/4") and am still trying to find the best setting. It seams well balanced with the 1/4", but you are correct about not being able to steer very well with the throttle. I think a little less toe-in would improve this at the exit of the corners. I'll admit I'm still on a steep learning curve on this stuff, but its fun anyway
.Before I get to the track in April, I really need to do three things:
1 - Install my accusump so I won't have to worry about the oil pressure
2 - Determine the rear roll-steer and set rear toe-in based on this measurement
3 - Finish the front brake cooling ducts so they work better
How's your car coming Charlie?
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Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Jason, sounds like you've got a good handle on things, and I'm certain you're going to make some good progress this year (setup and driving). 
My project(s) are, shall we say, suffering from those pesky budgetary constraints that hinder us all from time to time, but I'm determined to stay the course not to make as many compromises as I made last major redux. If I get the engine on the dyno by fall I'll feel like I've really done something. To make lemonade out of things, one benefit of the delay is the extra time to learn more... and likely find additional stuff at which more $$$ could be thrown.
My project(s) are, shall we say, suffering from those pesky budgetary constraints that hinder us all from time to time, but I'm determined to stay the course not to make as many compromises as I made last major redux. If I get the engine on the dyno by fall I'll feel like I've really done something. To make lemonade out of things, one benefit of the delay is the extra time to learn more... and likely find additional stuff at which more $$$ could be thrown.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
http://forums.corvetteforum.com/show....php?t=1919770
Racer
Joined: Mar 2006
Posts: 276
Likes: 1
From: Pistoia PT (ITALY)
There is a very simple and accurate system to set the front and rear toe in you park lot!
Make a small line with a fine white pencil on the threads o your wheel.... and make it, let say, in the front part of the wheel and with a square make in the ground a small line on the ground as a projection of the line on the wheel.
Do it for both the wheels...... then push your car in order to let the wheels to make 1/2 turn (so the mark will be in the rear of the tire).
With the square make the same projection on the ground of the mark.... be accurate!
Now you ca movve away your car and measure the distance between the front and rear marks.
The difference is the toe-in or out!
This is the most accurate system I have found to do a toe check at the track!
Make a small line with a fine white pencil on the threads o your wheel.... and make it, let say, in the front part of the wheel and with a square make in the ground a small line on the ground as a projection of the line on the wheel.
Do it for both the wheels...... then push your car in order to let the wheels to make 1/2 turn (so the mark will be in the rear of the tire).
With the square make the same projection on the ground of the mark.... be accurate!
Now you ca movve away your car and measure the distance between the front and rear marks.
The difference is the toe-in or out!
This is the most accurate system I have found to do a toe check at the track!
Racer
Joined: Dec 2004
Posts: 410
Likes: 0
From: Wichita Kansas
I run a small amount of toe out in the front less than 1/8 and about 3/8 toe in rear. You are correct about making it harder to throttle steer but on slick tight Auto X courses this allows me to get on the throttle hard in mid corner. If the car pushes I just dial in a bit more rear shock. I have dual adjustable Penski's. I don't think this would be a very good track set up as the car would probably have too much understeer.