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02-02-2003, 04:57 PM
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CC Member
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Join Date: May 2002
Location: maryland,
Posts: 39
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Not Ranked
Tire Pressure
What is the proper tire pressure I should use in my Superformance Cobra w/ B.F. Goodrich tires?
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02-02-2003, 05:58 PM
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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
Hey Purepop:
Superformance says 18PSI all the way around for normal driving up to 25PSI for performance. Keep in mind these are big tires on light cars. You need to maximize the footprint, don't over inflate.
I've been running 20PSI for 2 years and the T/As look like new!
Bob
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02-02-2003, 06:50 PM
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CC Member
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Join Date: Jul 2001
Location: randleman, NC,
Posts: 407
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Not Ranked
purepop,
The Weavers told me 24-26 psi for street driving. I'm running BFG T/A's 255 x 60 and 275 x 60 15's.
h dog
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02-02-2003, 08:36 PM
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Senior Club Cobra Member
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Join Date: Jan 2001
Location: Bloomfield Hills, (Detroit area),
Mi
Cobra Make, Engine: Superformance 156, ex Paxton 351, now a 392 Ford Racing Stroker
Posts: 1,666
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Not Ranked
i have been all over the board from variants of 18 front and 25 rear to 26/26. i finally settled on a range of 20-22 f/r except for long trips and i kick it up to 26 f/r. you will get as many different answers here as there are combos available. play with it, anything over 26 though in my car and you can drive over a dime and tell if it is heads or tails. bill
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07-26-2010, 06:51 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
I always kept an eye on tread depth wear,using a gauge.Making sure the tread is wearing even all the way across.Here in NorthEast with season changes and temp swings another reason to check.Hard to remember pressures.
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02-03-2003, 11:40 AM
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Average Guy
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Join Date: Sep 2002
Location: Rushville,
IN
Cobra Make, Engine: red Shell Valley, white stripes
Posts: 579
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Not Ranked
Like the post above, I have tried many different tire pressures and combinations of tire pressures. Is there any prevailing wisdom as to how to determine how low one can go without running a danger of dismounting the tire from the wheel in hard cornering? I normally run 20-28 lbs.
__________________
When I said I wanted to be somebody, I probably should have been more specific...
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02-03-2003, 12:00 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
You've got to deal with a bunch of "depends" here, and that's not what you wear for bladder control problems.
First off, tire brand doesn't mean much when it comes to tire pressure, but tire size means a lot . . . the bigger the tire, the less the pressure. The same applies to tire load, but is directly proportional . . . the more load, the more pressure.
What you're going to use the car for is very important. Racing requires higher pressures than for the street. But to arrive at the correct pressure requires a bit of testing to say the least because camber is also a factor under racing conditions. For the street, camber should be about straight up--a little negative at the rear--and pressures generally in the mid 20s at the front and high 20s at the rear. Keep a close eye on tire wear whatever pressures you run. Wear at the edges means too low pressure and wear in the middle means too high. So all I can say is try it and drive it, then makes changes accordingly.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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02-03-2003, 03:26 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
Boy, did I make a mistake. Front tire pressure should be a bit higher than the rears, or in the high 20s to start. Start the rears in the mid 20s and proceed as I said above.
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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07-25-2010, 07:45 PM
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CC Member
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Join Date: May 2007
Location: Goshen,
ny
Cobra Make, Engine: Gary Edwards Racing 460
Posts: 444
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Ive been running 19 on the rears. I also have TA's. I am wearing more in the middle. Go to 18 like it says in the manual. (for the street)
I went 2 lbs higher in the front and they look like new. 6K miles.
__________________
Its not the will to win that matters....Everyone has that. Its the will to prepare to win that matters.
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07-25-2010, 08:39 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 CBattaglia
Ive been running 19 on the rears. I also have TA's. I am wearing more in the middle. Go to 18 like it says in the manual. (for the street)
I went 2 lbs higher in the front and they look like new. 6K miles.
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That seems to be the sweet spot for 15" tires. I've been running 20 in the back and 22 in the front for a while, and it seems to be perfect after 8k miles.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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07-25-2010, 09:11 PM
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CC Member / Sponsor
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Join Date: Jan 2002
Location: Provo,
UT
Cobra Make, Engine: HiTech Legends GT500
Posts: 1,359
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Not Ranked
Some other things to think about...
The tire pressure at normal operating temperature is more important than cold tire pressures. Nitrogen helps with the tire pressure changes. Tire changers who use lots of soapy water are not doing you any favors.
Fuel mileage goes down with lower tire pressure.
Steering response decreases with tire pressure.
Ride gets softer with lower pressure.
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07-25-2010, 09:04 PM
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CC Member
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Join Date: Apr 2008
Location: Elkton,
MD
Cobra Make, Engine: Superformance #2689 Roush 427R TKO 600
Posts: 188
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Not Ranked
They say 18, but with the yokos 21 works for me maybe a little stiff but wears good!
WldBil
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07-25-2010, 09:19 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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do you guys know your answering a 7 year old thread?
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07-25-2010, 09:25 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 FWB
do you guys know your answering a 7 year old thread?
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It's an ageless question.  
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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07-25-2010, 10:15 PM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,310
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Not Ranked
With that low of psi, don't you guys wear out the front tires fast ?
Meaning too high wears out the centers, too low the outsides.
__________________
Regards,
Kevin
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07-25-2010, 10:28 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 FUNFER2
With that low of psi, don't you guys wear out the front tires fast ?
Meaning too high wears out the centers, too low the outsides.
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8K miles on my car and I can't see any wear pattern what so ever. I did pull the wheels off last week for an annual check and decided to have them all balanced because I noticed that one of the rear wheels had lost the wheel weights. I went for drive and couldn't tell the difference...seems the same as before.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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