Track Day Tyre Pressures for Michelin Cups..?
Discussion
Next time out on some pilot sport cups..
So i can back to back them with the PS'2s and post my results..
Anyone got some track experience on pressures with cups..? are they a more of a slick tyre side wall construction, and i can ge the pressures down a bit..?
The PS2's i have to run hard to keep them in shape but im guessing the cups will be lower than these on the track..
So i can back to back them with the PS'2s and post my results..
Anyone got some track experience on pressures with cups..? are they a more of a slick tyre side wall construction, and i can ge the pressures down a bit..?
The PS2's i have to run hard to keep them in shape but im guessing the cups will be lower than these on the track..
Great, thanks.. thats about where I thought.. 32 hot or 26/27 cold..
Way different to PS2's.. I'm having to run 42fr / 43rr hot pressures to get a decent footprint and keep the side walls in shape..
I'm reckoning on 2 or 3 seconds a lap quicker round the GP @ Slitherstone.. or do you rate them worth a bit more..?
Way different to PS2's.. I'm having to run 42fr / 43rr hot pressures to get a decent footprint and keep the side walls in shape..
I'm reckoning on 2 or 3 seconds a lap quicker round the GP @ Slitherstone.. or do you rate them worth a bit more..?
Interesting... I was running mine to a wear footprint , chalk marking the outer edge of the tyre ..and letting them down untill i got a footprint just on the edge of the tread blocks.. this technique was mainly to preserve the fronts which were just killing the outer edges in 2 hours before .. the pressure figure i ended up with was about 38 cold front 37 cold rear.. when i got back .. not so scientific as your gadget tho' 
But now i'm running -2.5 neg / side on the front - 2.0 rear.. i reckon I can get the pressures down a fair bit.. and go for grip rather than tyre life..!
What do you reckon the cups are worth / lap round the GP..? over a PS'2
But now i'm running -2.5 neg / side on the front - 2.0 rear.. i reckon I can get the pressures down a fair bit.. and go for grip rather than tyre life..!
What do you reckon the cups are worth / lap round the GP..? over a PS'2
Why dont you Nitrogen fill the tyres?
That way, your hot and cold temps are the same.
Its been standard for even street cars in the states for a long time, but a pure nitorgen fill means no moisture in the tyre, thus nothing to expand or contract with heat, so pressures remain constant.
Bikers in the UK have been doing it for years too, and even Kwik Fit offer nitrogen filling.
That way, your hot and cold temps are the same.
Its been standard for even street cars in the states for a long time, but a pure nitorgen fill means no moisture in the tyre, thus nothing to expand or contract with heat, so pressures remain constant.
Bikers in the UK have been doing it for years too, and even Kwik Fit offer nitrogen filling.
Erm, it costs £1 per tyre to fill with Nitrogen from places such as Kwik Fit.
Its 'that' mainstream these days.
Added to the fact nitrogen molecules are much larger than oxygen molecules it doesnt seep from the tyres so no need to refill all the time.
So you have a constantly maintained pressure, as it doesnt change with heat, there is no need to do anything except get it checked every 6 months.
Its 'that' mainstream these days.
Added to the fact nitrogen molecules are much larger than oxygen molecules it doesnt seep from the tyres so no need to refill all the time.
So you have a constantly maintained pressure, as it doesnt change with heat, there is no need to do anything except get it checked every 6 months.
Thanks for the info, i didnt know it was mainstream now.. how do they purge all the air out to start with..? do they need to flush it .. as a part air mix wouldnt be up to much.. i will get my track set done ..!
The results of Pilot Sport Cups over PS2's then... 3-4 seconds... brilliant tyres.. once hot.. the pressures went all over the place, and not uniform either, front left got hotter which i expected, coming in and resetting them to 32 fr / 34rr.. they were great.. bl**dy scary to start with tho from cold teflon coated almost, took 6 laps to get up to operating temperature.. but once up there, fantastic boots..
I was hanging onto the GT3's last night, to my suprise, and even beat a GT2 on the brakes into Copse..
Pagid RS29 front pads were awesome, no overheating and vibration.. great night on the tarmac..
The results of Pilot Sport Cups over PS2's then... 3-4 seconds... brilliant tyres.. once hot.. the pressures went all over the place, and not uniform either, front left got hotter which i expected, coming in and resetting them to 32 fr / 34rr.. they were great.. bl**dy scary to start with tho from cold teflon coated almost, took 6 laps to get up to operating temperature.. but once up there, fantastic boots..
I was hanging onto the GT3's last night, to my suprise, and even beat a GT2 on the brakes into Copse..
Pagid RS29 front pads were awesome, no overheating and vibration.. great night on the tarmac..
RatBoy, have you tried CUPS in the wet?
I was wondering how well they went as I did a session a year ago with me on Conti Sport 2's and they seemed to give better wet weather grip than another chap there on CUPS.
It was also pretty cold at the time (just above 0) so perhaps it was more a temp thing.
I was wondering how well they went as I did a session a year ago with me on Conti Sport 2's and they seemed to give better wet weather grip than another chap there on CUPS.
It was also pretty cold at the time (just above 0) so perhaps it was more a temp thing.
Sure... I've run PS2's many times and they are fine, one out lap and 3 hot laps is about it.. I found they do get too hot and go away a bit.. I also found that the increased front camber will extend the life plenty.. you really need to get 2.5 -3 neg on the front end.. the car destroys the outer shoulders on stock geo..
I also found that to preserve the fronts on stock geo I had to run them high on pressures like 43 hot.. this held them in shape, but the grip is not so good, its a trade off really on tyre life vs grip, you can get part worn PS2's off ebay for 50 quid a corner so the fronts are a throw away item on the day... rears you will get 3-4 days out of them.. forget 225's go 235 frt 265 rr.. (std csl)
If you can get the camber sorted out, then they are loads better as you can run them softer, and the grip comes back.. 32 frt / 34 rr cold...
Cups in the wet i havn't tried yet, but on a zero degree day i think your wasting your time on them, teflon coated and dangerous..! they need to get hot to work..
i've got a cutting guide to turn them into full wets, which i am going to try next time its raining..
I also found that to preserve the fronts on stock geo I had to run them high on pressures like 43 hot.. this held them in shape, but the grip is not so good, its a trade off really on tyre life vs grip, you can get part worn PS2's off ebay for 50 quid a corner so the fronts are a throw away item on the day... rears you will get 3-4 days out of them.. forget 225's go 235 frt 265 rr.. (std csl)
If you can get the camber sorted out, then they are loads better as you can run them softer, and the grip comes back.. 32 frt / 34 rr cold...
Cups in the wet i havn't tried yet, but on a zero degree day i think your wasting your time on them, teflon coated and dangerous..! they need to get hot to work..
i've got a cutting guide to turn them into full wets, which i am going to try next time its raining..
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