what psi is everyone using?

spike_africa · 05-25-2007, 07:19 AM

ON the 17x8 wheels with stock sized 245's? mine worn very uneven with the pressure ford says to use. I am about to replace them and get an alignment so i dont want to ruin them.

MattJ · 05-25-2007, 07:23 AM

I run 38 psi on my pirellis.

blownstang · 05-25-2007, 10:58 PM

30-32 psi

r3dn3ck · 05-26-2007, 09:36 AM

on 35psi-max I run 32, on 44 max I run 40, on 52 max I run 40. There's no reason to underinflate performance tires for street use. Drop the pressures in half for drag time.

07_427r · 05-26-2007, 12:03 PM

32 PSI in mine.

jeredan2003 · 05-27-2007, 04:16 PM

32psi and yes its normal for the middle to get bald way before the outside edges. What you get when you have a v8 with RWD haha.

05-27-2007, 04:58 PM

32 front 36 rear

v6'stang · 05-27-2007, 05:52 PM

Quote:

Originally Posted by jeredan2003

32psi and yes its normal for the middle to get bald way before the outside edges. What you get when you have a v8 with RWD haha.

lol, and for those of us with the sixxers they're a b*tch to rotate! i mean ya got one tire that's almost bald and 3 that are all good.

to hell with the one tire fire!

Ryan · 09-13-2007, 07:18 PM

zigzagg321 · 09-13-2007, 07:40 PM

not running stock sizes...but 36-38 rear and 32-34 front.

BigDipper · 04-02-2008, 07:44 PM

I had a similar problem with my 04 GT. The inside of the front tires were worn out bad and unevenly. When I took it to get aligned,they said it was due to low tire pressure. I was running the 30lbs Ford suggested.Had it re-aligned and put 44lbs in a 50lb tire and no more problems!

Dream · 04-02-2008, 08:06 PM

bone stock 40-43 psi........i duno y. just a european habit i guess

redfire04 · 04-02-2008, 10:31 PM

Quote:

Originally Posted by blownstang

30-32 psi

+1

Dave04Mustang · 04-02-2008, 10:47 PM

30-32 also

BlackTang01 · 04-03-2008, 11:13 AM

40 HERE

01FR500 · 04-03-2008, 01:24 PM

35.5psi for all four corners for me. Usually start at 41.5psi for autoX.

crignaj · 04-03-2008, 01:58 PM

36 psi all around. I have 275's on all 4 corners on cobra rims.

gimpster · 04-17-2008, 09:25 PM

Here's a method I've been using for several years now on new tires that works great. The chalk method.

With a cold vehicle and cold tires, air them up way over pressure. 40 psi should be OK. Take a chalk and mark a chalk line sideways across the tread of a front and rear tire. Drive your vehicle several yards (30-60 or so should do it). Now look at the chalk marks.

You should see the inside of the chalk marks worn off of the tread but the outsides should still be showing. In other words, the bowed out overinflated tire was wearing the middle of the tread and not touching the outside of the tread.

Release a couple of pounds of pressure from the tires and repeat the experiment. Continue until the complete chalk marks wear evenly. (You might want to lose another pound to make sure the entire tire is bearing down across the tread once the entire chalk mark disappears at the same time). You have now determined the tire pressure at which you are keeping the entire tread on the road.

Under this pressure you are wasting available fuel economy, generating excess heat, and prematurely wearing the tread. Over this pressure you will get better mileage at the cost of comfort and decreased tread life. Keeping at this pressure will wear the tire evenly and thus extend its life to its greatest extent and offer the best compromise possible between gas mileage, comfort, and safety (you'll have your whole tread on the road). The pressures may be a couple of pounds different between front and back for your particular vehicle application.

Wombozi17 · 04-18-2008, 12:57 AM

that is interesting. well said gimpster. makes sense to me, its worth a try

nyheyman · 05-24-2008, 07:38 PM

I just brought new tires. I will give this method a try and let you know how i do.
Thanks

05-25-2007, 07:19 AM	#1 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,965	what psi is everyone using? ON the 17x8 wheels with stock sized 245's? mine worn very uneven with the pressure ford says to use. I am about to replace them and get an alignment so i dont want to ruin them. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

05-25-2007, 07:23 AM	#2 (permalink)
MattJ Senior Member Join Date: Dec 2004 Location: Racine, WI Posts: 10,243	I run 38 psi on my pirellis. __________________ 2001 Mustang GT Premium - Mineral Grey

05-25-2007, 10:58 PM	#3 (permalink)
blownstang Senior Member Join Date: Nov 2005 Location: Chicago, IL Posts: 426	30-32 psi __________________ 2003 DSG Mustang GT 5spd Full Bolt On's, Full Suspension, Built Rear 271/303

05-27-2007, 04:16 PM	#6 (permalink)
jeredan2003 Senior Member Join Date: Nov 2004 Location: Murfreesboro, TN Posts: 1,788	32psi and yes its normal for the middle to get bald way before the outside edges. What you get when you have a v8 with RWD haha. __________________ 2003 DSG GT 5-speed Hellion 62mm and Flowmaster catback..... My bonestock 2v engine had been through 2 years of NX 100 shot, 3 years running 8-12lbs vortech s-trim, got into boost daily while racing on the weekends, had 157,000 miles on it, and was running like new

04-02-2008, 10:47 PM	#14 (permalink)
Dave04Mustang Not Banned Join Date: Jul 2006 Location: Austin, TX Posts: 2,335	30-32 also __________________ sig by PcolaV6

05-26-2007, 09:36 AM	#4 (permalink)
r3dn3ck Wowbagger hates me too! Join Date: Nov 2005 Location: Magrathea/California Posts: 7,182	on 35psi-max I run 32, on 44 max I run 40, on 52 max I run 40. There's no reason to underinflate performance tires for street use. Drop the pressures in half for drag time.

05-26-2007, 12:03 PM	#5 (permalink)
07_427r Junior Member Join Date: May 2007 Posts: 23	32 PSI in mine.

05-27-2007, 04:58 PM	#7 (permalink)
zigzaggthefag321 Posts: n/a	32 front 36 rear

09-13-2007, 07:18 PM	#9 (permalink)
Ryan Senior Member Join Date: Jun 2007 Posts: 110	30

09-13-2007, 07:40 PM	#10 (permalink)
zigzagg321 yup. Join Date: Sep 2007 Location: OH Posts: 6,806	not running stock sizes...but 36-38 rear and 32-34 front.

04-02-2008, 07:44 PM	#11 (permalink)
BigDipper Junior Member Join Date: Feb 2008 Posts: 23	I had a similar problem with my 04 GT. The inside of the front tires were worn out bad and unevenly. When I took it to get aligned,they said it was due to low tire pressure. I was running the 30lbs Ford suggested.Had it re-aligned and put 44lbs in a 50lb tire and no more problems!

04-02-2008, 08:06 PM	#12 (permalink)
Dream Senior Member Join Date: Feb 2008 Posts: 778	bone stock 40-43 psi........i duno y. just a european habit i guess

04-03-2008, 11:13 AM	#15 (permalink)
BlackTang01 Member Join Date: Dec 2007 Location: Merced California Posts: 58	40 HERE __________________ --=BT01=--

04-03-2008, 01:24 PM	#16 (permalink)
01FR500 Cones Beware Join Date: Sep 2006 Location: Texarkana, TX/Conway, AR Posts: 997	35.5psi for all four corners for me. Usually start at 41.5psi for autoX. __________________ 2003 GT H&R SuperSports \| Tokico Illumina dampers \| Maximum Motorsports c/c plates \| MM XL SFCs \| JLT RAI \| MGW shifter \| Alum. radiator \| other goodies... Coming Soon: MM Panhard Bar thanks to Zigzagg321

04-03-2008, 01:58 PM	#17 (permalink)
crignaj Member Join Date: Apr 2007 Location: Pasadena, Calif. Posts: 53	36 psi all around. I have 275's on all 4 corners on cobra rims.

04-17-2008, 09:25 PM	#18 (permalink)
gimpster Junior Member Join Date: Mar 2008 Posts: 5	Here's a method I've been using for several years now on new tires that works great. The chalk method. With a cold vehicle and cold tires, air them up way over pressure. 40 psi should be OK. Take a chalk and mark a chalk line sideways across the tread of a front and rear tire. Drive your vehicle several yards (30-60 or so should do it). Now look at the chalk marks. You should see the inside of the chalk marks worn off of the tread but the outsides should still be showing. In other words, the bowed out overinflated tire was wearing the middle of the tread and not touching the outside of the tread. Release a couple of pounds of pressure from the tires and repeat the experiment. Continue until the complete chalk marks wear evenly. (You might want to lose another pound to make sure the entire tire is bearing down across the tread once the entire chalk mark disappears at the same time). You have now determined the tire pressure at which you are keeping the entire tread on the road. Under this pressure you are wasting available fuel economy, generating excess heat, and prematurely wearing the tread. Over this pressure you will get better mileage at the cost of comfort and decreased tread life. Keeping at this pressure will wear the tire evenly and thus extend its life to its greatest extent and offer the best compromise possible between gas mileage, comfort, and safety (you'll have your whole tread on the road). The pressures may be a couple of pounds different between front and back for your particular vehicle application.

04-18-2008, 12:57 AM	#19 (permalink)
Wombozi17 Senior Member Join Date: Oct 2007 Location: Lake in the Hills, IL Posts: 605	that is interesting. well said gimpster. makes sense to me, its worth a try __________________ k

05-24-2008, 07:38 PM	#20 (permalink)
nyheyman Senior Member Join Date: Jul 2007 Location: South Carolina Posts: 115	I just brought new tires. I will give this method a try and let you know how i do. Thanks __________________ 2003 V6

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