Wear on slicks

[derek]

I was running with pirelli slicks yesterday that had only done couple of track days. Started to get some vibration and the front left and the outer edge have raised ridges evenly spread around the wheels across approx 2-3 inches of the width of the tyre from the outside. Swapped front around and the ridges developed again on front left. I was running about 28psi and -3.5 degrees camber. Anyone seen this before.

[DazBlackCSL]

Slicks make you feel every single inch of the road Derek .. Pick up any shit and you'll feel it .. Over brake and flat spot em and you'll feel it.

Wouldn't worry about vibration, difficult to really see in the pics, tyres look a little lumpy and that you've picked up a fair bit of rubber on the shoulders

[derek]

It's the two edges in the middle of pics that are the outer edges of the wheels. the ridges are quite big and are equidistant around the edges. It's like mini speed humps all around the outer edge of tyres never seen this before.

[shimmy]

if i were to guess, and it is a guess, id say you need way more neg camber

[CSLManual]

I have to say I'm amazed you can use slicks on a standard road car, I'd have thought it's break all sorts of things. Madness.

[derek]

if i were to guess, and it is a guess, id say you need way more neg camber

Anyone running more than -3.5 car was going well before the vibration started

[rstoughy]

What sort of times were you setting with the slicks Derek?
I spent all Tues PM there testing in the rain.

[shimmy]

Anyone running more than -3.5 car was going well before the vibration started

-3.5 is very low for slicks, more like cup camber

[derek]

Best was 60.7 done 60.2 on same tyres last month car is about 5mph slower on main straight than Csl it's just under a sec slower than best Csl time

[derek]

-3.5 is very low for slicks, more like cup camber

I was using the Simpson setup you gave me several years ago any recommendations for camber on slicks

[shimmy]

I was using the Simpson setup you gave me several years ago any recommendations for camber on slicks

that was Cups....slicks is well different. Also that was Cup settings for a cmpromise as its a rioad and track car unlike yours which is i guess track only.,

youd need to get pyro testig and advice and to ask soemone more knowledgable than me, but i think youll be around -5 deg


may not be the problem though :beer:

[derek]

that was Cups....slicks is well different. Also that was Cup settings for a cmpromise as its a rioad and track car unlike yours which is i guess track only.,

youd need to get pyro testig and advice and to ask soemone more knowledgable than me, but i think youll be around -5 deg


may not be the problem though :beer:

thanks for your help:thumbs:

[billyboysm3]

I run -5 to -6 front camber on slicks.

Makes a massive difference on turn in.

I left it like it yesterday on a wet track and It wasn't to bad either.

[derek]

I run -5 to -6 front camber on slicks.

Makes a massive difference on turn in.

I left it like it yesterday on a wet track and It wasn't to bad either.

Thanks Billly I'll try more camber. Just need more slicks now

[billyboysm3]

-3.2 ish is perfect for cups and even wear.

I really need someone with a pyro thing.

Still not done a dry UK track day, managed 4 sessions yesterday, 3 wet, one damp. Car had great grip on Goodyear Eagle F1's.

Billy