lol.....the trick is to get a happy medium between low enuff to get god gri off te start, but high enough to not affect stability
personally i dont bother much, have done once or twice with no real improvements, so run mainly at normal pressures
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17-02-2005, 13:20 #11Forum User
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17-02-2005, 13:21 #12Banned
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Its a well know fact F1 cars put MORE pressure in tyres on qualifying runs where grip is important, but tyre life isnt.
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17-02-2005, 13:23 #13Forum User
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and its a well known fact that all pro drag racers drop the pressure in the tyres to as low as 10 psi in those hoooooj slicks to get grip off the line.the front ends usuaully in the air so steerin by throttle
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17-02-2005, 13:33 #14Banned
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LOL, depends on the rubber you are running too. I did put the caveat about 185 55 15 rubber. This rubber IMO needs higher pressure because they have taller sidewalls. Let the pressure drop and you get a 'spongy' sidewall.
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17-02-2005, 14:29 #15Forum User
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Im running Uniroyals 195-50-15's all round with approx 30 psi. I have an electric air pump and digital reader so i can adjust the pressures when im there.
Air temps are raging from 2 -5 deg C on the sunday, which is quite chilly so i assume that the tyres will probably drop in temp a little anyway.
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17-02-2005, 15:18 #16Banned
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Let us know how pressures affected runs if you can tell
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18-02-2005, 00:34 #17Forum User
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There is a lot of variety in the speed of 172 in general with some running as quick as 14.1 (chip/filter/zorst/stripped) to 14.6 (standard) to 15.4/5 (Shite!) lol Tbh I'd say a good cup will usually beat a good williams. Contraversial!
But if you get a good start you've always got a chance..oh and slip a de-cat on there if you have'nt already!
Oh and on the subject of tyre pressure I've tried normal and 20psi front/40 psi front, did'nt notice much difference..tbh
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18-02-2005, 00:40 #18Forum User
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martin you get home ok then? didnt blow the car up filling her up with petrol??
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18-02-2005, 00:46 #19Forum User
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Yeah, no problem mate, quick pit stop..sorted! This thing pulls like a train...big difference to my williams.
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18-02-2005, 00:49 #20Banned
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Youve bought his car?
Can i buy your wheels?
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