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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

tire psi confused !

  • Thread starter Thread starter Killa
  • Start date Start date Oct 21, 2008

Killa

Active Member
Jul 9, 2007
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49
Oct 21, 2008
#1
  • Oct 21, 2008
  • #1
my current tire is 245/45/17 max psi is 44, I think ford recomment is 30-35 psi, what should I use for the front and back ? thanks
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
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39
UCSD/La Jolla
Oct 21, 2008
#2
  • Oct 21, 2008
  • #2
34 front 32 back for fuel mileage. 31 front 29 back for comfort. 29 front 27 back for more grip is how i do it.
 

Killa

Active Member
Jul 9, 2007
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Oct 21, 2008
#3
  • Oct 21, 2008
  • #3
CobraRed_96_GT said:
34 front 32 back for fuel mileage. 31 front 29 back for comfort. 29 front 27 back for more grip is how i do it.
Click to expand...

Can I use 35 all around ?
 
D

DKVL

New Member
Oct 12, 2008
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Oct 21, 2008
#4
  • Oct 21, 2008
  • #4
I keep mine at 30 front and back. I stick with what ford recommends if you have stock tires.
 

Killa

Active Member
Jul 9, 2007
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Oct 21, 2008
#5
  • Oct 21, 2008
  • #5
DKVL said:
I keep mine at 30 front and back. I stick with what ford recommends if you have stock tires.
Click to expand...

current running
BFGoodrich g-Force T/A KDWS 245/45/17 44max psi Front
Michelin Pilot Sport A/S 245/45/17 44 max psi Rear.

so still stick with ford recomment ?
 

98COBRA281

10 Year Member
Nov 24, 2007
1,348
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59
Port St. Lucie, Florida
Oct 21, 2008
#6
  • Oct 21, 2008
  • #6
i run 245-45-17 / 275-40-17 coopers, max psi is 51, i run 50psi all around........
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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Oct 21, 2008
#7
  • Oct 21, 2008
  • #7
KillaGT said:
current running
BFGoodrich g-Force T/A KDWS 245/45/17 44max psi Front
Michelin Pilot Sport A/S 245/45/17 44 max psi Rear.

so still stick with ford recomment ?
Click to expand...

Definatly drop them.

While it is at the max psi you can put in the tire, it is still overinflated. That will result in acclerated tread wear in the middle of the tire. Drop it down to 32psi and give your tires some more life.

98COBRA281 said:
i run 245-45-17 / 275-40-17 coopers, max psi is 51, i run 50psi all around........
Click to expand...

Good God mangski, I bet your car feels like a wooden plank going down the road...

Seriously, your tread will start to dissapear in the middle of your tires too. They key is to find a PSI that has a broad contact patch. To low a PSI, the outside of your tread wears quicker. Too much PSI, the middle of the tread wears quicker. Just right PSI, everyone is happy, lol.



Just ask me how I know about all this...
 

98COBRA281

10 Year Member
Nov 24, 2007
1,348
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59
Port St. Lucie, Florida
Oct 21, 2008
#8
  • Oct 21, 2008
  • #8
BurningRubber said:
Definatly drop them. Good God mangski, I bet your car feels like a wooden plank going down the road...

Seriously, your tread will start to dissapear in the middle of your tires too. They key is to find a PSI that has a broad contact patch. To low a PSI, the outside of your tread wears quicker. Too much PSI, the middle of the tread wears quicker. Just right PSI, everyone is happy, lol.
Click to expand...

hmm. it does ride rely hard, maybe ill let a few pounds out, the tread wear is perfect, but my front tires are almost gone on the edges but good in the center, i realy need cc plates and a bumpsteer kit...........
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
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39
UCSD/La Jolla
Oct 21, 2008
#9
  • Oct 21, 2008
  • #9
BurningRubber said:
Definatly drop them.

While it is at the max psi you can put in the tire, it is still overinflated. That will result in acclerated tread wear in the middle of the tire. Drop it down to 32psi and give your tires some more life.



Good God mangski, I bet your car feels like a wooden plank going down the road...

Seriously, your tread will start to dissapear in the middle of your tires too. They key is to find a PSI that has a broad contact patch. To low a PSI, the outside of your tread wears quicker. Too much PSI, the middle of the tread wears quicker. Just right PSI, everyone is happy, lol.



Just ask me how I know about all this...
Click to expand...
+1000

Draw a thick line in chalk across the tire and then drive/move it or do a quick burn out. If the outsides are left add pressure, and vice versa. There's no way you should be running 44-50psi unless you have potholes the size of swimming pools in your town.

I run like 30-33 front and 27-30 back.
 

isjoining

New Member
Mar 28, 2007
143
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0
Orlando, FL
Oct 21, 2008
#10
  • Oct 21, 2008
  • #10
I run 30 psi all around. The ford sticker in my glove box says to run 30 psi cold front and back.
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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Oct 21, 2008
#11
  • Oct 21, 2008
  • #11
98COBRA281 said:
hmm. it does ride rely hard, maybe ill let a few pounds out, the tread wear is perfect, but my front tires are almost gone on the edges but good in the center, i realy need cc plates and a bumpsteer kit...........
Click to expand...

Center tread might be allright because your excessive negative camber is wearing the inside edges of your tires.

Mine was like that when I first got it before I switched springs and had it aligned.

You will likely notice the tread wear problem on the rears first though, esp. if you have a led foot.

CobraRed_96_GT said:
+1000

Draw a thick line in chalk across the tire and then drive/move it or do a quick burn out. If the outsides are left add pressure, and vice versa. There's no way you should be running 44-50psi unless you have potholes the size of swimming pools in your town.
I run like 30-33 front and 27-30 back.
Click to expand...

I guess I should go inflate my tires then...

Good advice on the chalk test, I thought of that after I posted. It's pretty much fool proof.

I run 33/34 up front, 32 in the rear. I like the front having a few PSI more, the Exclaim's are a little lazy when pushed hard and need some extra stiffness.
 

SaleenGT2001

Well-Known Member
Jul 18, 2005
2,811
4
58
Four Oaks NC
Oct 22, 2008
#12
  • Oct 22, 2008
  • #12
32psi all around on a stock car. i've been working w/ tires for 5 years now.

i run 32 in the fronts and 20 in the rears with the 18's and 40 in the front and 15 in the rears with the 15's
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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Oct 22, 2008
#13
  • Oct 22, 2008
  • #13
isjoining said:
I run 30 psi all around. The ford sticker in my glove box says to run 30 psi cold front and back.
Click to expand...

30psi cold will equal out to right around 32psi once the tires are warmed up...
 

Killa

Active Member
Jul 9, 2007
1,006
56
49
Oct 23, 2008
#14
  • Oct 23, 2008
  • #14
today I just find out one of my other tire say max is 51 psi, should I still put 32psi ?
 

isjoining

New Member
Mar 28, 2007
143
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0
Orlando, FL
Oct 23, 2008
#15
  • Oct 23, 2008
  • #15
there should be a sticker in your car that tells you what PSI to set it at. Or just set it to between 30-32 cold.
 

SaleenGT2001

Well-Known Member
Jul 18, 2005
2,811
4
58
Four Oaks NC
Oct 23, 2008
#16
  • Oct 23, 2008
  • #16
the max pressure means NOTHING!!!

set it by the sticker on the car
 

Stark77

Member
Jun 11, 2008
501
0
16
Tallahassee, FL
Oct 23, 2008
#17
  • Oct 23, 2008
  • #17
yes, you want to AVOID max pressure - as previously mentioned filling up slightly below max will send your tires above max once they get heated up. Not a safe situation - especially with rear wheel drive.
 

bhuff30

Founding Member
Dec 11, 2001
6,037
35
129
Olathe KS
Oct 23, 2008
#18
  • Oct 23, 2008
  • #18
Max pressure works pretty well when running auto-X.

Otherwise, manufacture recommended is best. My 97 still wears the middle of the tire, even when I run the recommended 32psi.
 

COramprat

...I can take it. I think.
20+ Year Stangneter
Mar 2, 2003
8,474
1,463
223
Sea of Tranquility
Oct 23, 2008
#19
  • Oct 23, 2008
  • #19
30-32...doesn't matter what the tire says.
 

Killa

Active Member
Jul 9, 2007
1,006
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Oct 23, 2008
#20
  • Oct 23, 2008
  • #20
Got it !! Thread close !
 
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