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Registered
Join Date: Jul 2001
Location: Connecticut
Posts: 1,942
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Some help for my DE tomorrow would be much appreciated. Thanks.
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Registered
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Start with stock tire pressures for your car. if this is your first DE, tire pressure should not be a keen focus, nor will you notice a difference. I have been racing now for two years, and we have had an entire coilover collapse on us in a 12 hour enduro, and did not notice until the race was over. Focus on the line and your will have a blast.
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Registered
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Try 36 to start with on all tires. Check pressure after each run. That's the pressure I ran with same sizes of rims and tires.
Andy '87 Carrera |
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Senior Member
Join Date: Mar 2001
Location: Calgary, Alberta, Canada
Posts: 424
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You should start with stock which is 29-36(F-R). However depending on your driving and the temperature outside; your car set up, etc. On colder days, like our last DEW (I am using Bridgestone SO-3 PP - with 6s & 7s) the tire pressure was 32 Front 34 Rear and worked very well.
Try it out and adjust after each run.Good luck. Drive safely. |
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Automotive Writer/DP
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Hot pressures for AO32 Rs on a 911 for autocross are Front 26, Rear 29. I would raise that to Front 28, rear 31 for the track. If you notice the tires getting "greasy" after they get hot, come in and bleed them off to these pressures - they don't like high pressures in my experience.
Randy Wells |
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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Don't use equal pressures f/r on a 911. I've heard that a good rule of thumb for a DE is 31/33 (f/r), and then see where the pressures go once the rubber heats up. The spiking from heat is what you're keeping an eye on. On a track, the tires will get much hotter, much faster, than any street driving would produce.
------------------ Jack Olsen My Rennlist page • My Pelican Gallery page • My Porsche Owners Gallery page [This message has been edited by JackOlsen (edited 09-26-2001).] |
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Registered
Join Date: Jan 2000
Posts: 6,950
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Those sound high. I have run A032R's on 16" before switching to 17" wheels. After continual bleeding off of air pressure, by the end of the day the cold pressure was 22-24 front and 24-26 back. With the pressure too high, these tires were terrible, almost dangerous. I also used white shoepolish to check the rollover and where the rubbing ended at the end of the usable treadwear, I left the pressure there. This was the main way I checked the pressure, since heat, the course your on, and how hard you are running have much to do with the tire pressure. When checking the tires immediately after a run, the tires were in the 30's. If you go out with pressure above 30, you will be in the 40's after a hard run..much to high for these compounds.
------------------ 8 9 9 1 1, The last of the line. [This message has been edited by 89911 (edited 09-26-2001).] |
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