tire pressure?
07-07-2001, 06:29 PM
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tire pressure?
Just checked the tire pressure (car has 18"s) and it's pretty darn low 29ft/35rr vs. 36/44 factory rec. However, the car really seems to be handling
well right now. Should it be handling better with this lower pressure, and should I continue to run them this low? TIA
well right now. Should it be handling better with this lower pressure, and should I continue to run them this low? TIA
07-08-2001, 09:20 PM
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We've had extensive discussions about this on the "old" 993-996 board. The consensus was that for the US, a great compromise was 32 FR and 36 RR. If you're driving at real high speeds, the factory pressures HOT (not cold) are probably very good. Again, this only works for the US where speeds are real low, in Europe where you'll hit 100MPH every day, this is probably a tad low
JM
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07-10-2001, 03:03 PM
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Originally posted by ben in lj:
<STRONG>What's the typical diff between hot and cold - 4 lb?</STRONG>
<STRONG>What's the typical diff between hot and cold - 4 lb?</STRONG>
07-10-2001, 08:42 PM
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"It depends on where and how hard you drive"
Then how do we apply that to Jean-Marc's:
"the factory pressures HOT (not cold) are probably very good."
It seems a cold number would be better. What is your rec on cold numbers for 18"s? TIA
Then how do we apply that to Jean-Marc's:
"the factory pressures HOT (not cold) are probably very good."
It seems a cold number would be better. What is your rec on cold numbers for 18"s? TIA
07-10-2001, 09:16 PM
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I always run 32/35 cold on the streets and as low as 28/31 on the track during very hot days. For those who have a 2WD car, a 2 psi differential is even better. Bear in mind that these are for street tires.
07-11-2001, 08:56 PM
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I know I'm late in the game in this thread, but isn't the factory recommended PSI for "cold" rather than "hot" tires? I've been driving my c4 inflated at the factory 36/44 cold pressure levels - should I really be driving with significantly lower inflation levels than the factory recommendation? I've always driven all my cars (I've had many) at factory recommended inflation levels - is there a reason why the 996 is different (well - I know it has no peer among cars under $100k - and few above that, but I mean re: inflation levels).
07-12-2001, 11:55 AM
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Originally posted by ben in lj:
<STRONG>Thanks Viken. So your saying you run 32/35 on 18"s on the street? What about the 2 psi diff? Does that mean 33/35?</STRONG>
<STRONG>Thanks Viken. So your saying you run 32/35 on 18"s on the street? What about the 2 psi diff? Does that mean 33/35?</STRONG>
Also, the actual tire you are running can and will react slightly differently to the same pressures.
07-12-2001, 12:00 PM
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Originally posted by Brian Robbins:
<STRONG>I know I'm late in the game in this thread, but isn't the factory recommended PSI for "cold" rather than "hot" tires? I've been driving my c4 inflated at the factory 36/44 cold pressure levels - should I really be driving with significantly lower inflation levels than the factory recommendation? I've always driven all my cars (I've had many) at factory recommended inflation levels - is there a reason why the 996 is different (well - I know it has no peer among cars under $100k - and few above that, but I mean re: inflation levels).</STRONG>
<STRONG>I know I'm late in the game in this thread, but isn't the factory recommended PSI for "cold" rather than "hot" tires? I've been driving my c4 inflated at the factory 36/44 cold pressure levels - should I really be driving with significantly lower inflation levels than the factory recommendation? I've always driven all my cars (I've had many) at factory recommended inflation levels - is there a reason why the 996 is different (well - I know it has no peer among cars under $100k - and few above that, but I mean re: inflation levels).</STRONG>
So, I really don't know why the factory recommends 36/44 but whoever tries lower pressures, finds better grip, better handling, more even wear and a better ride.
07-12-2001, 11:44 PM
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"I think most 2WD people have been happy with 32/34. I suggest that you experiment with your pressures by starting at 36/38 and working your way down. I am only suggesting the higher psi's because I don't know how hard you drive your car on the streets."
Thanks for taking the time to help out. I drive it VERY spirited ALWAYS.
Thanks for taking the time to help out. I drive it VERY spirited ALWAYS.