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03-24-2009, 01:13 PM
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CC Member
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Join Date: Aug 2001
Location: Egypt,
NA
Cobra Make, Engine: SPF 2726 MkIII Roush 427IR
Posts: 52
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Not Ranked
Tire Pressure
I received a gorgeous set of wheels from Vintage Wheels.
315/35/17
255/40/17
What is the typical pressure everyone runs on these wheels/tires ?
Input greatly appreciated.
__________________
Intouch
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03-24-2009, 03:03 PM
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CC Member
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Join Date: Mar 2008
Location: fremont,
ca
Cobra Make, Engine: superformance/427 fe ford
Posts: 436
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Not Ranked
whats it say on the tire?
__________________
1952 MG TD - 53 HP 1970 SS454 Chevelle - 900hp 2007 spo2669 - 485hp 2001 Spclconst. softtail - 114HP 2006 Roadglide - 88HP
sold Roadglide.....bought 09 XR 1200 - 90 hp stock
i would rather live one day as a lion, than one thousand days as a lamb.
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03-24-2009, 03:25 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by csx wnab
whats it say on the tire?
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Probably too high for the weight of an SPF.  I'm sure someone with 17's will check in.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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03-24-2009, 03:37 PM
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CC Member
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Join Date: Feb 2006
Location: Gray,
TN
Cobra Make, Engine: Backdraft 342 Stroker, 400hp
Posts: 189
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Not Ranked
I have the same on my Backdraft, try 29 lbs front, 28 lbs. rear, cold, and adjust from there.
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03-30-2009, 06:16 AM
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CC Member
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Join Date: Feb 2006
Location: Glenwood Landing or Southampton,
NY
Cobra Make, Engine: Superformance, FRP460 Big Block
Posts: 975
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Not Ranked
I use 24# front and 22# rear w/ 17s. Mine weighs in at 2650 full up big block.
__________________
Ray
New York
SPF#1052 11mpg
CAV GT40 MONO29 9mpg
'94 35th Anniversary Rover Mini Cooper 32mpg
'01 MB CL600 V12 18mpg
'08 Volvo S80 18mpg
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03-30-2009, 06:45 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
Remember, the air carries the load not the tire. Superformance recommends 18psi for every day driving and 25 psi for performance driving for the 15s that are typically used. I would see no reason to reduce the contact patch by going any higher than the pressures they recommend.
Bob
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03-30-2009, 08:05 AM
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CC Member
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Join Date: Feb 2005
Location: Perrysburg,
OH
Cobra Make, Engine: SPF #298 427 FI
Posts: 497
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Not Ranked
I would say 21-24 for daily driving
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03-30-2009, 01:58 PM
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CC Member
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Join Date: Aug 2001
Location: Egypt,
NA
Cobra Make, Engine: SPF 2726 MkIII Roush 427IR
Posts: 52
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Not Ranked
Quote:
Originally Posted by csx wnab
whats it say on the tire?
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psi rating on tires is always the max rating the tires can handle/are approved for. this is certainly not what we should run them on.......
__________________
Intouch
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03-30-2009, 02:29 PM
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CC Member
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Join Date: Nov 2007
Location: Houston,
Tx.
Cobra Make, Engine: SPF #1235
Posts: 170
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Not Ranked
I run 20 psi front and rear with my 17's. Tire wear seems even.
__________________
Superformance #1235
460/T5
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03-30-2009, 04:28 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine: Hurricane HM1073 Keith Craft Genesis 427FE/482 CI
Posts: 390
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Not Ranked
I run 26 F&R
I've heard that 10 lbs for every thousand pounds is a good starting point.
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03-30-2009, 05:57 PM
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CC Member
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Join Date: Sep 2003
Location: San Jose,
Ca
Cobra Make, Engine: SPF #1436 514
Posts: 1,488
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Not Ranked
I run 23 to 25 psi. I have the 335 rears on 11.5" wheels. They don't contact the ground real flat on the back. My buddy has his 335 on 12" wheels. That seem's better.
Scott
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03-30-2009, 06:46 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by scootter
I run 23 to 25 psi. I have the 335 rears on 11.5" wheels. They don't contact the ground real flat on the back. My buddy has his 335 on 12" wheels. That seem's better.
Scott
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Scott,
Your rear tires rarely have contact with the ground anyway. 
I'm running 20 in the back and 22 in the front. I've had it lower and higher, but this seems to be the right balance.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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03-30-2009, 09:10 PM
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Senior Club Cobra Member
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Join Date: Jul 1999
Location: SF Bay Area,
CA
Cobra Make, Engine: SPF #1019
Posts: 1,657
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Not Ranked
17's require much more air pressure than 15's. I don't recall the exact physics, but it's kinda like why a bycycle tire has like 60lbs, but they are so small. I think it has to do with the smaller the volume, the higher the pressure.
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04-02-2009, 12:52 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
Quote:
Originally Posted by Got the Bug
Scott,
Your rear tires rarely have contact with the ground anyway.
I'm running 20 in the back and 22 in the front. I've had it lower and higher, but this seems to be the right balance. |
Ditto...... |
04-02-2009, 03:01 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,444
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Not Ranked
That will vary a little bit from tire to tire. Don't go by the number stamped on the sidewall. That's the max inflation pressure.
Generally speaking you want about 1psi per 100#. If your car weighs 2600# wet and loade, you should start with about 26psi. But, that's just the starting point. There's two ways to determine the correct weight. Both of these work for any tire on any 4 wheeled vehicle.
1. Use a tire pyrometer. After driving down the highway, pull over and check temps on each edge and in the middle. If temp is highest in the middle it'sover inflated. If it's lowest in the middle, it's under inflated. If it's highest on one of the edges, the alignment is off. This will give you the most accurate results.
2. Use blackboard chalk. Drive down the highway and get the tires nice and warm. Pull over, and place a heavy chalk line across the tread. Drive foreward about 20'. Check the chalk line to see where it's been rubbed off the most. Thin in the middle means it's over inflated.
Be sure to check both front and rear. My car is almost perfectly balanced, so I use 26psi front and rear. I determined the pressure with a tire pyrometer that I bought off e-bay for $50
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