[Swift016]

Guys,

Last track run was-2.7t and -2.0r
Most wear on 3R was on outer half of the contact patch.

GTE, Atlanta reset -3.4f and -2.4r...... no move adjustment available on the fronts.

Going to Road Atlanta on the 12th , and Ill update afterwards....driving come the fronts now build 2-3 psi more than the rear... before the reset, the f only built about 1psi higher than the rear... yes, the toe was reset

Cheers,
Bill

[h018871]

Hey Bill, apologies if you've previously answered.
What caster are you running?

[SFV1LE]

Originally Posted by h018871

Hey Bill, apologies if you've previously answered.
What caster are you running?

To get the most performance on track with this car (assuming no concern about street wear), I recommend max camber and caster.

I know others have gotten -3.5-3.7 front camber.

Even with that, you will cord the outsides of 3Rs in 2-3 days every time with hard track use.

[ZRacerLE]

Any theories on why GM doesn't recommend such high camber? I'll switch too if it's worth it.

[SFV1LE]

Originally Posted by ZRacerLE

Any theories on why GM doesn't recommend such high camber? I'll switch too if it's worth it.

Tire wear on street I think, they might feel the -2.7 reco isn't so extreme that drivers can live with it daily which is true.

If you drove daily with -3.5+ on GY 3Rs with significant miles, the insides might wear very fast. But if you drive your ZLE with low miles mostly for spirited canyon runs and on track like me you're wearing the outsides much faster.

[Swift016]

Originally Posted by h018871

Hey Bill, apologies if you've previously answered.
What caster are you running?

Stock caster... dont remember the number offhand....I dont think caster has much affect on wear or cornering performance ..ymmv 😊

[Swift016]

Originally Posted by SFV1LE

Tire wear on street I think, they might feel the -2.7 reco isn't so extreme that drivers can live with it daily which is true.

If you drove daily with -3.5+ on GY 3Rs with significant miles, the insides might wear very fast. But if you drive your ZLE with low miles mostly for spirited canyon runs and on track like me you're wearing the outsides much faster.

I put about 2000 street miles on my Michelin 4s with
-2.7f/ -2.0r..... the greater wear was still on the outside half... no tracking on the Michelins..

[h018871]

Originally Posted by Swift016

Stock caster... dont remember the number offhand....I dont think caster has much affect on wear or cornering performance ..ymmv 😊

Caster is funny how it effects camber when turning. When you have more (within reason) caster: when the inside wheel turns it gains positive camber, when the outside wheel turns it gains negative camber.
basically when in a corner with more caster, the inside wheel tilts top out to reduce inside wear and the outside wheel tilts top in....increasing camber to widen the contact patch.
Maybe not that great of an explanation, I know.

This is about 8 degrees of caster on a 5th gen 1LE (approximately 1.4 over stock)
I'm running ~ 9 degrees of caster with between 2.0 and 2.5 neg camber on my ZL1 and the wear is pretty flat across the tread. I am running the F1G3 non-R tires

[ZRacerLE]

Originally Posted by SFV1LE

Tire wear on street I think, they might feel the -2.7 reco isn't so extreme that drivers can live with it daily which is true.

If you drove daily with -3.5+ on GY 3Rs with significant miles, the insides might wear very fast. But if you drive your ZLE with low miles mostly for spirited canyon runs and on track like me you're wearing the outsides much faster.

Makes sense, but they also specify to switch back to street alignment after the event. That's why I've always assumed this was the optimal camber for tracking a stock ZLE (-2.7 that is), otherwise they would have gone higher.

Anyone know what they ran in the Nurburbring record run? If they went higher, then dammit, I'll go higher!

[ZRacerLE]

Originally Posted by Swift016

Guys,

Last track run was-2.7t and -2.0r
Most wear on 3R was on outer half of the contact patch.

GTE, Atlanta reset -3.4f and -2.4r...... no move adjustment available on the fronts.

Going to Road Atlanta on the 12th , and Ill update afterwards....driving come the fronts now build 2-3 psi more than the rear... before the reset, the f only built about 1psi higher than the rear... yes, the toe was reset

Cheers,
Bill

How did it go with the higher camber?

I just did a time trial with -2.7 front camber. I did very well, but the outside of the fronts are toast. Pressure was around 34 psi hot.

[SCCAForums]

If you are on the GYSC3R's I was still cording the inside with 2.7 Negative. My outsides were fine.

If you're running a Hoosier, or a Street Tire... i could see needing max camber... but according to the people I spoke with at GM, Bill ran those settings that are published as 'track settings' at the nurburgring on the GYSC3R's.

Best regards,
Dave

[SFV1LE]

Fastest ZLE lap times I’ve seen on many tracks in CA were with about -3.5 front. This was on 3R at Buttonwillow, Sonoma, Thunderhill, Laguna. Check out video of these ZLE laps at Turn in Track Out on YouTube, he actually ran over 3.5. Abel Chevrolet did the alignment.

[waterman]

[Swift016]

Originally Posted by SCCAForums

If you are on the GYSC3R's I was still cording the inside with 2.7 Negative. My outsides were fine.

If you're running a Hoosier, or a Street Tire... i could see needing max camber... but according to the people I spoke with at GM, Bill ran those settings that are published as 'track settings' at the nurburgring on the GYSC3R's.

Best regards,
Dave

Dave,
My 3r’s were definitely wearing the outside fronts with -2.7 camber... I run 0 toe. Any chance you are running front toe- out ??
Regards,
Bill