12-10-2011, 05:01 AM
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#1
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Registered User
Join Date: Dec 2010
Location: Hot Springs Village, Arkansas
Posts: 245
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What tire pressures do you run? (street)
I've been fooling around with tire pressures and now I'm kind of confused. What tire pressures front/rear are folks using for general street driving? I'm trying to get sort of a balanced, nimble feeling and the stock pressures make my car understeer.
When I read some old posts I get conflicting information about whether the front/rear bias gives more or less understeer.
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12-10-2011, 05:14 AM
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#2
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Front : 235/35/19 32 psi
Rear : 275/30/19 36 psi
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Don't worry … I've got the microfilm.
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12-10-2011, 05:29 AM
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#3
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Registered User
Join Date: Nov 2009
Location: Madison, Georgia
Posts: 1,012
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I agree, 29 in the front is too low in my opinion, I run 17 inch tires and like between 31 and 32 in the front and 36 in the back.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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12-10-2011, 05:32 AM
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#4
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Registered User
Join Date: Jun 2007
Location: Littleton, CO
Posts: 456
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I shoot for 34 front and 36 back when at operating temperature.
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"Of all the extreme sports I've ever participated in- windsurfing, kite boarding, wake boarding, tow-in surfing and snowboarding- skiing, for me, made everything else easy."
-Chuck Patterson
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12-10-2011, 05:36 AM
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#5
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Registered User
Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,561
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19" Carrera Classic wheels. PS2 tires. About 1 PSI below OEM spec, cold tire pressures. Nitrogen.
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12-10-2011, 06:24 AM
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#6
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Registered User
Join Date: May 2009
Location: Frederick, MD
Posts: 1,396
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front: 225/40-18 @ 32psi
rear: 265/35-18 @ 36psi
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"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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12-10-2011, 06:57 AM
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#7
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Registered User
Join Date: Jan 2011
Location: Peoples Republic of Kaliforneea
Posts: 686
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I run close to factory recommended pressures.
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02 Boxster (DD sans kids)
03 Dodge Ram Quad Cab (Stuff hauler)
06 Maserati Coupe Cambiocorsa (Personal weekend car)
06 Maserati Quattroporte (Family hauler)
08 Corvette Z06 (Track car)
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12-10-2011, 10:24 AM
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#8
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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32/32. At 29/36 I had very noticeable lift throttle oversteer in any sweeper.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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12-11-2011, 06:59 PM
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#9
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Registered User
Join Date: Jan 2011
Location: Peoples Republic of Kaliforneea
Posts: 686
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Quote:
Originally Posted by san rensho
32/32. At 29/36 I had very noticeable lift throttle oversteer in any sweeper.
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Lift throttle oversteer will occur in any turn, especially at the track.
__________________
02 Boxster (DD sans kids)
03 Dodge Ram Quad Cab (Stuff hauler)
06 Maserati Coupe Cambiocorsa (Personal weekend car)
06 Maserati Quattroporte (Family hauler)
08 Corvette Z06 (Track car)
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12-11-2011, 08:55 PM
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#10
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by 986_c6
Lift throttle oversteer will occur in any turn, especially at the track.
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+1 Lifting in the middle of a fast sweeper is like pressing the ejection button. It works every time.
Regarding the OP, I usually run 32/32 cold on the street. Running 29 up front will add a little ride comfort but not much noticeable change in handling.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 12-11-2011 at 09:05 PM.
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12-10-2011, 03:55 PM
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#11
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Street
225/45/17 29psi Front
255/40/17 33psi Rear
Hankook Ventus R-S3
Track
225/45/17 32psi cold/37psi hot Front
255/40/17 33psi cold/38psi hot Rear
Nitto NT-01
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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12-11-2011, 02:25 AM
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#12
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Registered User
Join Date: Nov 2008
Location: Use 2B NW Ohio, now NE Ohio
Posts: 563
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Street only, 32 F / 37 R.
78%N2, 21%O2 mix
__________________
My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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12-11-2011, 05:35 PM
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#13
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Matt
Join Date: Nov 2011
Location: Colorado
Posts: 284
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I run recommended (per the manual) pressures, no problem.
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12-11-2011, 05:50 PM
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#14
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by vath2001
Street only, 32 F / 37 R.
78%N2, 21%O2 mix
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LOL, I understand it's good to put a little Ar, CO2 and H2O in that mixture.
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12-11-2011, 06:35 PM
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#15
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Registered User
Join Date: Apr 2007
Location: Bay Area
Posts: 524
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I try to run factory spec but once the tire warms up tire pressure goes up signficantly during summer months. Took a long drive to Flagstaff last Sept from the Bay Area and had to drive thourgh Mojave desrt. Saw my tire pressure go up as much as 4 psi front and rear. Winter months seems it doesn't go up as much.
Now I run 30 up front and 34 at the rear.
__________________
2008 Boxster S PDE2
02 Boxster S Blk on Blk(Stock for the Wife)
88 turbo S (My Toy) slightly modified
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12-13-2011, 06:03 AM
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#16
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07 Carrera S Cab
Join Date: Nov 2005
Location: New Jersey
Posts: 2,273
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Quote:
Originally Posted by vath2001
Street only, 32 F / 37 R.
78%N2, 21%O2 mix
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That's only 99%. What's the last 1%?...hot air? 
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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12-13-2011, 07:34 AM
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#17
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Registered User
Join Date: Sep 2009
Location: toronto
Posts: 2,668
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30 / 34..........
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986 00S
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12-13-2011, 07:42 AM
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#18
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by Boxtaboy
That's only 99%. What's the last 1%?...hot air? |
See my post above. Ar, CO2, water.
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12-14-2011, 01:45 AM
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#19
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Registered User
Join Date: Nov 2008
Location: Use 2B NW Ohio, now NE Ohio
Posts: 563
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Quote:
Originally Posted by Boxtaboy
That's only 99%. What's the last 1%?...hot air? |
Vaporized Tiger's Blood..... Winning
__________________
My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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12-11-2011, 10:23 PM
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#20
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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Maybe I'm just unconsciously compensating with steering for trail throttle oversteer, but it is very pronounced with 29/36 psi and essentially non existent when I run even pressures.
__________________
Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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