FAO: CSL owners with cups

[Gibbo]

Hi there

A question guys, I used to own a CSL but really can't remember the answer to my question.

Building a track focused M3, current weight is around 1330kg with a weight distribution of around 54/46 so no longer 50/50. Power is 367BHP!
KW Clubsports and car is corner weighted.

I am on 265/18/35 cups all round and it's very wheelspin happy.

DRY Traction
1st gear - can't go full throttle at any point, wheelspin, 1/2 throttle at most.
2nd gear - Only full throttle with heat in tyres, otherwise slight wheel spin.
3rd - no problems!

WET Traction
1st gear - LOL
2nd gear - Tyres full temperature, ease it in and maybe, but typically lots of wheelspin.
3rd gear - typically OK.


So those with CSL's on cups or track focused M3's how is your traction? Can any of you floor it in second in the wet without issues?

Just wondering if I have a lack of rear traction and if so if there are any mods I can do for rear traction apart from putting bags of sand in the boot or bodies lol. :D

[shimmy]

You have a problem, I don't get any real wheel spin in a straight line with same set up.

Age of cups?
How many heat cycles?
geo setting (camber)?
Tyre pressures?
Ride height?
Springs?


Have feeling maybe your car is pitched too much to the front I.e not lower at back than front.

[Gibbo]

Originally Posted by shimmy

You have a problem, I don't get any real wheel spin in a straight line with same set up.

Age of cups?
How many heat cycles?
geo setting (camber)?
Tyre pressures?
Ride height?
Springs?


Have feeling maybe your car is pitched too much to the front I.e not lower at back than front.

Hi mate

Cups are brand new, done 200 miles, no better, done a track day no better. Federal RSR's fitted previously were even worse.

Geo settings are:-



Pressures: 31 cold all round

Ride height: Front 580mm measured from bottom of wheel lip / rear 573mm measured from bottom of wheel lip.

Picture of car ride height:-



Springs: stock KW Clubsport springs, tried both ring dry and ring wet settings on dampers.


A picture of the car in action:-
[img]http://i1145.photobucket.com/albums/o504/Gibbo205/Donny1.jpg~original[/





I bring it up as I drove a friends 2005 M3 CS earlier, standard on 19's with Michelin PSS and it had no issues with full throttle in 2nd in the wet. His car obviously has more weight in rear, better wet tyres and is a much newer car, but had no slip at all. Mine just seems to spin up too easily in the wet for my liking.

[shimmy]

Swap your friends rims/tyres with ours and see what happens.

[mattCSLnut]

Originally Posted by Gibbo

Hi mate

Cups are brand new, done 200 miles, no better, done a track day no better. Federal RSR's fitted previously were even worse.

Pressures: 31 cold all round

Ride height: Front 580mm measured from bottom of wheel lip / rear 573mm measured from bottom of wheel lip.

I bring it up as I drove a friends 2005 M3 CS earlier, standard on 19's with Michelin PSS and it had no issues with full throttle in 2nd in the wet. His car obviously has more weight in rear, better wet tyres and is a much newer car, but had no slip at all. Mine just seems to spin up too easily in the wet for my liking.

Your cold pressures are too high for Track Work, hence why U suffer from excessive wheel spin ... they should be around 26 psi cold.

[Gibbo]

Originally Posted by shimmy

Swap your friends rims/tyres with ours and see what happens.

Would you say my current ride height and geo are ok then mate?

[Gibbo]

Originally Posted by mattCSLnut

Your cold pressures are too high for Track Work, hence why U suffer from excessive wheel spin ... they should be around 26 psi cold.

Yes on track I set them too 26 cold and try to keep them around 31 hot, on track I get zero slip in 2nd in the dry, only on the road.

Wet I get a lot of spin in 2nd on road, not tried track wet yet.


Are than any suspension mods to aid rear traction or is adding weight my friend?

[shimmy]

Originally Posted by Gibbo

Yes on track I set them too 26 cold and try to keep them around 31 hot, on track I get zero slip in 2nd in the dry, only on the road.

Wet I get a lot of spin in 2nd on road, not tried track wet yet.


Are than any suspension mods to aid rear traction or is adding weight my friend?

To be fair, the roads for the last 3 months have been slippery as fook

[mattCSLnut]

Originally Posted by Gibbo

Yes on track I set them too 26 cold and try to keep them around 31 hot, on track I get zero slip in 2nd in the dry, only on the road.

Wet I get a lot of spin in 2nd on road, not tried track wet yet.


Are than any suspension mods to aid rear traction or is adding weight my friend?

Public roads have less grip (and more $hit on them) then TD surfaces so modulate your throttle with more finesse and greater care.
Furthermore, at this time of the year with ambient temps hovering below 7 Deg. Celsius CUPs have very low, if no grip at all (as they are designed not to)
You want good tyre grip this time of the year get Winter tyres

[northernjim]

Originally Posted by Gibbo

Yes on track I set them too 26 cold and try to keep them around 31 hot, on track I get zero slip in 2nd in the dry, only on the road.

Wet I get a lot of spin in 2nd on road, not tried track wet yet.


Are than any suspension mods to aid rear traction or is adding weight my friend?

so you have NEW cups, in the cold and wet, and you are surprised that you are spinning your wwheels



Have you tried setting the kw to full soft at the back.


and why is your weight distribution so wrong?