Re: The autocross example is evidence in itself....

Re: The autocross example is evidence in itself.... - Saab Performance Bulletin Board - Saabnet.com

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Re: The autocross example is evidence in itself.... Posted by gorper (more from gorper) on Fri, 22 Oct 2004 13:24:51

In Reply to: The autocross example is evidence in itself...., Chad, Fri, 22 Oct 2004 12:35:05 Members do not see ads below this line. - Help Keep This Site Online - Signup

"It has less traction because the contact patch is smaller."

That's not necessarily the reason why grip is decreased. A tire has a spring rate. Increasing tire pressure increases its rate, which, in turn, increases weight transfer. The increased weight transfer decreases (yes, decreases) the tire's grip. You can easily feel a tire's rate by swapping out yer gumball-grippy 50-series Super Turbo Stickums with some plush 65 or 70 series touring tires. Or you could just bump up PSI on whatever you run and feel the difference.

You can achieve the same breakaway effect (assuming we're talking about getting a FWD to rotate) by using lower pressures, too. Lower pressure tires will break because of decreased tire patch as a result of excessive sidewall roll. Lower PSI is more predictable than higher.

From what I've read, radials don't really round out like bias-ply tires.

0.02

posted by 65.101.15...

Posts in this Thread:

performance driving, Nick Urban, Thu, 21 Oct 2004 23:01:34
- Re: performance driving, Nick Urban, Fri, 22 Oct 2004 07:58:20
  - Higher Pressure will lead to wearing out the centers..., Chad, Fri, 22 Oct 2004 08:26:29
    - PS..if really interested use a Raytek to check temps., JohnB, Tue, 26 Oct 2004 06:28:12
    - our local AX rules require 40psi min front and rear., JohnB, Tue, 26 Oct 2004 06:26:30
    - really .... I wonder., Dean, Fri, 22 Oct 2004 11:49:45
      - Yes, Schu, Tue, 26 Oct 2004 07:22:39
      - Re: really .... I wonder., Dave Chicago, Fri, 22 Oct 2004 19:03:26
      - Re: really .... I wonder., damien, Fri, 22 Oct 2004 12:15:48
        I thought the front & rear bias was different?, SteveY, Fri, 22 Oct 2004 13:21:53
        Re: I thought the front & rear bias was different?, Bill Davies, Sat, 23 Oct 2004 05:10:11
        The autocross example is evidence in itself...., Chad, Fri, 22 Oct 2004 12:35:05
        Re: The autocross example is evidence in itself...., Dean, Sat, 23 Oct 2004 17:39:56
        Re: The autocross example is evidence in itself...., gorper, Fri, 22 Oct 2004 13:24:51 <-- Viewing This Message
        If anyone thinks this subject is simple >, Bill Davies, Sat, 23 Oct 2004 05:28:16
        Yeah but I didn't want to get into that point...., Chad, Fri, 22 Oct 2004 13:56:36
- Re: performance driving, CFishgo, Fri, 22 Oct 2004 07:19:01
- that 2.3 is bullet proof, jak , Fri, 22 Oct 2004 06:12:09
- Re: performance driving, Jeremy R., Thu, 21 Oct 2004 23:37:17
  - Driving schools, Eric van Spelde, Fri, 22 Oct 2004 06:14:48

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