FAO:trackday gurus.
03 July 2002, 05:25 PM
#1
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What pressure should I pump my slicks up to?They are Colway Formula2's,205x50x15.Car weighs around 1250kg(gtir).
I've never driven on slicks before,anything I need to know?
I've never driven on slicks before,anything I need to know?
03 July 2002, 05:33 PM
#2
29psi from cold.
Just take it easy for the first few laps to get heat into them.
Check regularly and rotate when neccessary....special emphasis to front nearside.
Remember....you'll stick to the surface like glue
Just take it easy for the first few laps to get heat into them.
Check regularly and rotate when neccessary....special emphasis to front nearside.
Remember....you'll stick to the surface like glue
03 July 2002, 07:39 PM
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Yes,I bought them off a gut who rallied his gtir.Mine's still limited so I doubt I'll go over the speed rating.Are they a suitable tyre for track use or more for the roads/tracks on a rally stage?
I've got 2 other sets of slicks as well,an intermediate and some michelin cut slicks which are so coarse it's unbelievable.They are far rougher than the other 2 sets and feel like sandpaper.
I'm hoping to get a 20 minute session on sunday(knackered gearbox so don't want to totally kill it),any idea if there are any sessions left?
I've got 2 other sets of slicks as well,an intermediate and some michelin cut slicks which are so coarse it's unbelievable.They are far rougher than the other 2 sets and feel like sandpaper.
I'm hoping to get a 20 minute session on sunday(knackered gearbox so don't want to totally kill it),any idea if there are any sessions left?
03 July 2002, 09:02 PM
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Interesting you should say that John!
It's not funny when you're exiting a corner at 120mph+ and the front nearside goes egg shaped on you! Luckily it was controllable and I just quickly slowed to about 15mph and crawled back to the pits! Could have been very serious!
They were rally tyres as well, but the guy never mentioned speed rating when he sold them.
It's not funny when you're exiting a corner at 120mph+ and the front nearside goes egg shaped on you! Luckily it was controllable and I just quickly slowed to about 15mph and crawled back to the pits! Could have been very serious!
They were rally tyres as well, but the guy never mentioned speed rating when he sold them.
03 July 2002, 09:16 PM
#7
Colway F2's are a remould. They are fine for the speeds the rally boys see but i wouldnt take one on track. 115MPH is still pushing it on these tyres.
The slicks you have may clean up OK. The roughness could be either crap picked up on the track, use a hot air gun and a hand paint striper to remove this crap, or it could be graining from overheating/scrubing the tyres. It's surprising how you can save a slick if you know what to look for.
Always check speed ratings on tyres, it's your responsibility. Never trust anyone. There are tyres made for lots of diferent disciplines and some are not suitable for track work.
The slicks you have may clean up OK. The roughness could be either crap picked up on the track, use a hot air gun and a hand paint striper to remove this crap, or it could be graining from overheating/scrubing the tyres. It's surprising how you can save a slick if you know what to look for.
Always check speed ratings on tyres, it's your responsibility. Never trust anyone. There are tyres made for lots of diferent disciplines and some are not suitable for track work.
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) they should be upto 35/36 when hot.
04 July 2002, 01:30 AM
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Interesting comments about pressures. I've always found them best at 28psi when hot
Eitherway try a range a see what feels best to you but please ensure that you regularly check the pressures as they will vary from corner to corner once upto optimum temperature.
Eitherway try a range a see what feels best to you but please ensure that you regularly check the pressures as they will vary from corner to corner once upto optimum temperature.
05 July 2002, 06:23 PM
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I'm with Mo, 26-28 psi when hot, depending on track temp. Any higher and they overheat and fall apart, any lower and they don't reach optimum temp.
Do 2 or 3 laps at 30psi to get some heat in and then re-set them.
They will have virtually no grip at all when stone cold, turning AND braking.
Do 2 or 3 laps at 30psi to get some heat in and then re-set them.
They will have virtually no grip at all when stone cold, turning AND braking.
15 July 2002, 09:44 PM
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I've checked the tyres for a speed rating but all I can find in small writing is 86V-I know V is good for 149 mph,but it is not next to the profile like on a road trye.I've checked colway's website and it says the tyres are speedrated.Anyone used these?I really don't want to run on them to find they disentegrate at 100mph.Cheers.
15 July 2002, 10:38 PM
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Hi there!
im with the lower pressures too.
did 161 miles round donno on the 7th and started at 29 cold, i found once id done a few laps they were up to 36psi, so i dropped them to 32 when hot and tried that.
it felt better more positive, so as a experiment i dropped them down to 30psi when hot in the afternoon, and they felt great, and seem to keep the positive feel for longer, suppose theres less chance of them over heating?
when they were cold they were at 26psi, so thats what im going to run mine at nnow, may even try 29psi when hot.
just my 2p worth.
cheers Lee
im with the lower pressures too.
did 161 miles round donno on the 7th and started at 29 cold, i found once id done a few laps they were up to 36psi, so i dropped them to 32 when hot and tried that.
it felt better more positive, so as a experiment i dropped them down to 30psi when hot in the afternoon, and they felt great, and seem to keep the positive feel for longer, suppose theres less chance of them over heating?
when they were cold they were at 26psi, so thats what im going to run mine at nnow, may even try 29psi when hot.
just my 2p worth.
cheers Lee
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