Welcome Guest!!!

Thank you for visiting the GM Kappa Performance Forum. This forum is the only performance oriented forum for all GM Kappa Platform Enthusiasts.  We hope you will join and share your experiences.  Becoming a member is FREE! If you want to advertise on this forum, email KappaPerformance at yahoo.com.

Registration required to view the forum attachments. Below is a sample of the current top 25 topics.
Supporting Membership has many advantages.

More information on becoming a supporting member or vendor can be found on the sub forum; Site Help and Suggestions; thread - Supporting Members and Vendors.
Pages: [1]   Go Down

Author Topic: Wet weather autocross tire pressure  (Read 4482 times)

0 Members and 1 Guest are viewing this topic.

Offline RufusMacblorf

  • Tech
  • **
  • Posts: 77
  • Karma: +1/-0
  • Location: portland, oregon
Wet weather autocross tire pressure
« on: March 03, 2011, 07:37:48 PM »
The first autocross events of the season are coming up soon, and the weather is still rainy and cold.  I've read a number of posts about recommended tire pressures in good conditions, but not in crappy conditions.  Does anyone have recommendations for tire pressures when the course is wet?
« Last Edit: March 03, 2011, 08:35:02 PM by RufusMacblorf »
Logged

Offline Vanguard

  • Master Tech
  • ***
  • Posts: 198
  • Karma: +0/-1
  • Location: Rockwall, TX
Re: Wet weather autocross tire pressure
« Reply #1 on: March 03, 2011, 09:42:01 PM »
I haven't experimented much with it, only because I've never run in the rain.  However, I'd venture a guess that you'd want pressures similar to when it is dry...just about to where the contact patch is at its maximum without rolling over. 

I'm sure others will chime in as well...I'm looking forward to other opinions!
Logged

Offline Critterman

  • Retired, thank you very much
  • Premium Member
  • General Manager
  • *
  • Posts: 13700
  • Karma: +18/-58
  • Baltimore/Washington Corridor
Re: Wet weather autocross tire pressure
« Reply #2 on: March 03, 2011, 09:59:59 PM »
I think SOB recommends a few more pounds in the Wet.
Logged
GONE: (but not forgotten) 2006 Cool named IXABEL (BISH-AH-BEL) Mayan for "Good Roads"
DDM StageIII intercooled Supercharger, Wisco ceramic coated pistons, Carrillo rods, superTech valves and Springs, Ported and polished head, Exedy Stage II Clutch,
big brake kit, slotted/drilled Rotors w/Porterfield pads & blue juice, Backbone, Probeam, Cross Strut Brace Underhood, trunk, & door Lights, ZOK suspension
JPM Center console, door inserts, & dash Seat bolster & lumbar support
Focuztech Tri-Y Header & hi-flow cat, Solo Performance SQR-2, Norm's Rear facia, Heated Seats, Blackface gau

Offline RufusMacblorf

  • Tech
  • **
  • Posts: 77
  • Karma: +1/-0
  • Location: portland, oregon
Re: Wet weather autocross tire pressure
« Reply #3 on: March 03, 2011, 11:51:33 PM »
Quote from: Vanguard on March 03, 2011, 09:42:01 PM
I haven't experimented much with it, only because I've never run in the rain.  However, I'd venture a guess that you'd want pressures similar to when it is dry...just about to where the contact patch is at its maximum without rolling over. 

I'm sure others will chime in as well...I'm looking forward to other opinions!

Thanks.  I live in the Northwest.  If I don't drive in the rain, I don't drive at all.
Logged

Offline boardkat

  • Master Tech
  • ***
  • Posts: 158
  • Karma: +0/-0
  • Location: Beaverton, OR
Re: Wet weather autocross tire pressure
« Reply #4 on: March 04, 2011, 03:30:19 AM »
huh, never seen you out before - i ran a grey gxp 'vert last year with my codriver (in BS), and just picked up a coupe.  engine is in pieces right now, so won't be running my car this weekend though (codriver's 350Z in CS most likely).  if you're running sunday, i'll look for you (i'll be doing tech).
anyway, early in the season in the cold, on both *specs or hwets, i usually run 4-6psi lower vs. a6 dry temps (both front and rear) to build up heat.  i'm not of the "run higher pressures to bow the middle of the tire and plow water out of the way" camp.
Logged
'05 Lotus Elise || SS/42
'09 GXP 5MT Sly Coupe #802 - RIP :(
'82 Reynard FF1600 || CM/70
'86 Golf || chumpcar monster

Offline elff

  • Premium Member
  • General Manager
  • *
  • Posts: 11381
  • Karma: +26/-58
  • Location: Keebler Tree House
Re: Wet weather autocross tire pressure
« Reply #5 on: March 05, 2011, 10:53:47 AM »
This is a little dependent on the tire you are running.

Can you provide some more information on your setup.

Thanks
Logged

Offline RufusMacblorf

  • Tech
  • **
  • Posts: 77
  • Karma: +1/-0
  • Location: portland, oregon
Re: Wet weather autocross tire pressure
« Reply #6 on: March 05, 2011, 05:31:54 PM »
Quote from: elff on March 05, 2011, 10:53:47 AM
This is a little dependent on the tire you are running.

Can you provide some more information on your setup.

Thanks

I'm running Star specs.  Stock suspension, so far, except for the Probeam and Backbone.
Logged

Offline RufusMacblorf

  • Tech
  • **
  • Posts: 77
  • Karma: +1/-0
  • Location: portland, oregon
Re: Wet weather autocross tire pressure
« Reply #7 on: March 05, 2011, 05:34:42 PM »
Quote from: boardkat on March 04, 2011, 03:30:19 AM
huh, never seen you out before - i ran a grey gxp 'vert last year with my codriver (in BS), and just picked up a coupe.  engine is in pieces right now, so won't be running my car this weekend though (codriver's 350Z in CS most likely).  if you're running sunday, i'll look for you (i'll be doing tech).
anyway, early in the season in the cold, on both *specs or hwets, i usually run 4-6psi lower vs. a6 dry temps (both front and rear) to build up heat.  i'm not of the "run higher pressures to bow the middle of the tire and plow water out of the way" camp.

Thanks. 

I'm a newbie.  I did half a day last fall, at the last event of the season.  I was at the morning practice session today.  I hope to be there tomorrow morning too, so I look forward to meeting you.
Logged

Offline elff

  • Premium Member
  • General Manager
  • *
  • Posts: 11381
  • Karma: +26/-58
  • Location: Keebler Tree House
Re: Wet weather autocross tire pressure
« Reply #8 on: March 05, 2011, 06:34:16 PM »
With the star specs, I'd leave them at the same pressure you do for dry.

They do good in the rain so you don't want to over inflate them and have only the center of the tires touching
Logged

Offline NormSky

  • Premium Member
  • Master Tech
  • *
  • Posts: 724
  • Karma: +0/-0
  • Location: OH-IO!
Re: Wet weather autocross tire pressure
« Reply #9 on: March 06, 2011, 12:23:15 AM »
Allot would  depend on track surface too. Bumpy surface in the rain is not fun. I'd go as low as you can without deforming the contact patch. Suspension stiffness will ply a role too.

Wet separates the men from the boys.  :)
 
Logged
07 Sky Hahn Boosted - 44 MPG  40 mpg with air conditioning on.
Pages: [1]   Go Up
 
Powered by EzPortal