Tyre pressure on 17"
Discussion
Tyre pressure depends on the stiffness of the side wall of the tyre. The lower pressures at 20/22 are perfect for b list track tyres such as R888's and ecsta V70's that are B list tyres and generally have very stiff side walls to stop flex and loss of contact patch. I use 20 all round on my griff on R888's.
Standard road tyres or A list have much softer side walls that crush more easily so in general they need a higher pressure to keep the full width of the tread on the road under hard cornering. I am not sure how stiff yours are but I would try 24-26 and see how it feels.
Standard road tyres or A list have much softer side walls that crush more easily so in general they need a higher pressure to keep the full width of the tread on the road under hard cornering. I am not sure how stiff yours are but I would try 24-26 and see how it feels.
The important thing is to take a pressure gauge and pump/compressor with you. You will gain 5-8 psi during the day, so will let air out. Phazed has the temps right. You will need to put air back in at the end of the day to get home.
I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
QBee said:
The important thing is to take a pressure gauge and pump/compressor with you. You will gain 5-8 psi during the day, so will let air out. Phazed has the temps right. You will need to put air back in at the end of the day to get home.
I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
Will that cause bump steer and make it even more twitchy for road use ?I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
SILICONEKID345HP said:
QBee said:
The important thing is to take a pressure gauge and pump/compressor with you. You will gain 5-8 psi during the day, so will let air out. Phazed has the temps right. You will need to put air back in at the end of the day to get home.
I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
Will that cause bump steer and make it even more twitchy for road use ?I have a mains compressor (under £100) which I take with me. All race tracks have mains electrics somewhere in the pits.
One other thing you can do is get your TVR guy to add one degree of camber on the front wheels - then your tyres will heat evenly across the tread and you will have much better cornering grip.
OleVix said:
phazed said:
24/22 for road
20/22 for track, these pressures are based on the wear pattern on the tyres, usually Triple 8s.
20/22 for track, these pressures are based on the wear pattern on the tyres, usually Triple 8s.
this is the best for max grip?
I used to keep my S02s below 20lbs for daily road use.
I went through 2 sets with perfectly even wear, never getting much less than 24k miles out of a set.
The next set was S03s and the same seemed to apply as well for them. Much more pressure than that and they were as unpredictable as anything (unless you call knowing you will slide off the road without any hint of what was coming; 'predictable'
).I tried those pressures for a few miles on Toyos when when the S03s were no longer available.
I probably don't have to tell most people how bad that felt. Like driving on a road made of sponge. Worse than my old '69 Pontiac Laurentian
Different tyres clearly may need entirely different pressures.
Interesting though to read how much it can vary in a day on the track.
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