MattW_VA

I'm trying out a square setup for the first time, with the 305-30-18 GAC scuffs. I had it out tonight bedding the brakes and the car feels *awfully* squirelly under braking. Any difference in alignment/ride height for a square setup vs staggered?

VetteDrmr

When I was running Toyo RA-1 275s on all 4 corners the car was slightly loose, but nothing I'd call "squirrely". I didn't change anything with my alignment, which is just a bit more aggressive than stock.

Of course, it could be completely different for your C6.

HTH, and have a good one,
Mike

the blur

I hate that feeling of squirelly-ness under braking. still happens to me every so often. I think it is from running toe out up front.....

gonzalezfj

When I run my C5Z with 17-305 front and rear (the T-1 setup) we drop the front about 1/2" to restore the correct rake (front lower than rear). This restores the car's downforce at high speeds and makes it stable.

Do you run any toe-out?


Frank Gonzalez

MattW_VA

I'm running a bit of toe out in the front, and I've been playing with the ride height since I had to pick the front end up a bit (it was pretty low) but I've got at least 3/4" of rake in it.

VetteDrmr

By "squirrely under braking" do you mean that the back end keeps trying to slide, or is the front end getting a bit darty on you? If the front end is getting busy under hard braking, it could make the back end feel like it's trying to come around on you.

Assuming you're bedding in your brakes on normal streets, I could easily imagine the fronts hunting quite a bit with your setup under braking.

HTH, and have a good one,
Mike

dmtnt

What kind of pads front and rear? I experienced this when running Wilwood H pads up front and E's in the rear. Switched to H's all around and the problem went away.

MattW_VA

Interesting-I'm running some older carbotech XP10s in the rear with the H's up front-maybe I'll throw the stockers in the rear tonight and see if that makes a difference...

0Randy@DRM

Toe out

Randy

MattW_VA

Care to elaborate?? What is your preferred setup?

Falcon

Matt, I run the square setup (315's all around) on mine. I notice it if I get real, real hard on the brakes, like at T.1 at VIR, when I really need all I can get, the azz end gets a little happy, but not dangerously so. I think it's more to do with the front end getting all the weight transfer and the bigger footprint getting more traction. It's not that big of a deal, but I know it's occuring, and it's very manageable.

I use the Wilwood H's, BTW.

MattW_VA

I've always found that the car likes to yaw a little under very heavy braking, but yesterday it was a major handful. Oddly, my recollection is that it seemed to exhibit more at lower speeds. I think the brake pad comment above is a good one, I'll play with it tonight, I have about a million different compounds laying around...

XPC5R

Less front toe out, or more rear toe in - I'd go with the second.

UstaB-GS549

I would check rear for toe out under braking. That will make car unstable. I'm not sure how much static toe in is required to keep rear from going to toe out.

MattW_VA

The car was set up with an RCH of rear toe in, if the brake pad thing doesn't pan out I'll get it re-checked..

Thanks all!

*Edit-DUH, if I changed the ride height that will definitely affect toe-right? Will have it checked tommorrow...

John Shiels

Don't think small ride height change will affect toe drastically. I think I have 1/16 out in front and 1/8 in on rear.

gonzalezfj

Matt, "within one RCH of rear toe-in" is not enough. You need at least 1/8" to 1/4" toe-in at the rear or else the car will be squirrelly.

Also, the first few brake applications with unbedded pads can make the car feel squirrelly because you can get different friction right/left as the pads are being bedded to the rotors. This is specially true when the rotors are used.

I'd get some toe-in on the rear and I bet your squirrellyness (man, what a word, eh?) will go away. Best of luck,

Frank Gonzalez

dmtnt

That's what I run.

Jason

:

MattW_VA

Well I just got it corner weighed and aligned, still likes to wander around under braking, it is a little better though. It does seem to be more at low speed (can't really practice a 145 to 65 on the street )

Oh well, we'll see come Saturday-especially if it rains!!