Tire tread de-lamination, Track abuse?

Im not a track expert. Do you think it seperated because these tyres are 2 years old? Can you track 2yr old tyres without this happening?

 

Seems that way alright.

 

What you did wasn't "track abuse" and no excuse for tire delamination. That said, why not go for a hotter tire-some Yoko AO48s or such? Probably good for a year or so and great for canyons and track days.

 

Luigi,

Actually this is perhaps a Ferrair/WSIR problem and too much negative camber. I run -3.25 in the rears and cord my passenger inside every two trackdays with slicks. I am not sure what kills them turn 2 or turn 8 but the draging of the passenger inside bead is like draging your toes while skatebording. You wipeout your shoes. I like the extra camber so I just buy more tires.

 

I'm quite surprised the SP5000's survived two days at Willow Springs, especially if it was the big track. Those are hard tires and typically like to chunk away at the tread, not really delaminate themselves.

Got pictures of the tires?

 

Never used Dunlops or those dreaded metric tires. Have done more than 15 track days on Mich Pilot PS2 (and at least another 15 on Mich Pilot Cups). My well-tweaked 308 seems to be relatively kind on tires, and i push them big time to the limits at various tracks. Perhaps you have an alignment problem or something is going awry with your suspension geometry to cause this problem.

Check alignment, check bushings, check shocks.... If all is in excellent condition and you are using stock shocks and springs, perhaps the lackluster performance of stock is causing too much suspension travel??? Sorry, i use very much uprated suspension so do not have severe body rolling as i regularly see with other (stock) 308QVs. Maybe it is time to uprate your suspension and also corner balance your car weight-wise?

Again, track the living shiznit out of the 308QV and have very even wear and my tires seem to last longer than i expected given the (ab)use they endure.

PS: i JUST REMEMBERED that with my old stock suspension the left rear shock (passenger rear on USA-type car) took a dump. Maybe the 308 has some type of weight problem or ???? on that corner in stock form?

 

When was the alignment last checked/set? I would be curious of the toe setting and camber.

 

Higher pressure in the rear ones is indicated on my door plate.....

That said..street tires are not track tires, and vise versa..

 

Agreed, but for wet days the PS2 seem to do quite ok.

FYI: In 2007 am dumping the Fcar in favor of a proper track car (Formula Continental), so one could argue that street cars should not be a track car. Many street cars simply can not take the stress.

 

It depends on how hard you drive of course, but remember that racing tyres are designed for the job and a LONG race is 1 hour +. On a track day you can easily run for 2-3 hours if not more.

On a dry track the large tread blocks on a new(ish) road tyre will move a great deal generating loads of heat in the tyre which it really wasnt designed to cope with. You can EASILY destroy a set of road tyres a day when driving on a circuit. When we ran an Escort Cosworth high speed ride car around Silverstone it would go through 8 road tyres a day easy (supplied free by tyre company). Even the Caterham's or Lotus Exiges can do a pair of rears a day.

You are using a road car, with road tyres and road suspension in an environment it wasn't designed to live in. Most people dont use their car to its fullest on track days and get away with high wear - but the more you go the quicker you get the closer you get to needing a racing car, which then isnt much fun on the road...ultimately you need two cars for 2 very different jobs.

As the button says, Comfort or Sport ?