tire pressure ?
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tire pressure ? - 11/9/2006 8:21:55 PM
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leepinlen
Posts: 104
Joined: 10/19/2006
From: sf bay area
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I just put on 18x9 with 255/45/18 tires and 18x10 with 275/40/18 tires on 06 GT, my question is that the air pressure was at 40 psi. I took it for a short ride and felt that the tires were slippery. Is 40lbs too much air? What would your recomendation be on the air pressure?
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RE: tire pressure ? - 11/9/2006 8:47:55 PM
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ponysnake99
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Joined: 10/30/2006
From: Durham, NC
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most tires come with a protectant layer on them from the factory, and there is a "tire break in" period the tire has to go through, so it may feel slippery...but if your worried about the psi, it should be on the side of the tire
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'99 Cobra: P-1SC @ 8 psi, full exhaust, subframes, 4.10's, and supporting mods
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In the market for a black Mach now
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RE: tire pressure ? - 11/9/2006 11:24:28 PM
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leepinlen
Posts: 104
Joined: 10/19/2006
From: sf bay area
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thanks for the reply snake, max on sidewall is 51psi, but I know that it would be way too much. just wondering what others might be running on their setups so that I have a starting point to adjust from. I'm thinking around 36psi for comfort and proformance.
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RE: tire pressure ? - 11/10/2006 12:33:27 AM
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ShadowDrake
Team MF Member #001
Posts: 2368
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From: Whitehall, Michigan
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Uh I've got a 265/35-18 tire up front, 295/35-18 tire out back (18x9 and 18x10 wheels respectively)... For the longest while I was running 28 psi all around... gave great grip but the center of my tread blocks always looked darker than the ones right next to it meaning it probably wasn't riding the ground as it should have been...
I bumped it up to 35 psi in front, 38 in rear and noticed the difference, road noise decreased by a LOT and it requires less throttle to maintain cruising speed... bumps actually feel less noticable, but it depends on the bump of course. Max pressures are 48/52 I think so I'm still a long ways from the max, but I'm just wondering what pressure we should actually use. No, I'm not going to follow the manual on this one because it's not the same tire, and it's not the same size.
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2004 Black Premium GT (5spd)
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RE: tire pressure ? - 11/10/2006 11:39:50 AM
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colin@tirerack
Posts: 356
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You always want to start with the recommended pressure that your manufacturer states in the owners manual and/or the placard on the inside of the door jam.
The tire only indicates max pressure which is different from the pressure the manufacturer suggests.
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Email: colin@tirerack.com
Phone: 877-522-8473
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RE: tire pressure ? - 11/10/2006 5:04:01 PM
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leepinlen
Posts: 104
Joined: 10/19/2006
From: sf bay area
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colin, thanks for the reply, I understand if I had put on same size tires and rims. These are 18x9and 18x10 rims with much larger tires(255/45 and275/40. Do lower profile tires need more air pressure or less air to work. What do u suggust in terms of psi?? Thanks
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RE: tire pressure ? - 11/10/2006 5:53:04 PM
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colin@tirerack
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The pressure required is dependent on the tires and the vehicle. Some tires need more air to carry the same load depending on size and construction.
What kind of tires do you have?
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Colin
Email: colin@tirerack.com
Phone: 877-522-8473
Tire Rack Website
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RE: tire pressure ? - 11/10/2006 11:43:29 PM
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leepinlen
Posts: 104
Joined: 10/19/2006
From: sf bay area
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I have the Sumitomo HTRZll, 255/45 on 9" rim and 275/40 on 10" rim. I started at 40psi but they felt slippery so I have dropped to 36psi and they feel better. I want to air it to best proformance and even wear. On a 06 Mustang GT, with TI cai&sct 91 tune, Magnaflow axleback exhaust. thinking about dropping car 1" with steeda ultralite springs next. Thanks for any info
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RE: tire pressure ? - 11/11/2006 3:20:18 PM
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colin@tirerack
Posts: 356
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You should start out at the pressure as indicated on the placard in the inside of your door jam and adjust from there.
If you are running 40 psi, your tires are overinflated.
Your tires carry their max load capacity at 36 psi.
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Colin
Email: colin@tirerack.com
Phone: 877-522-8473
Tire Rack Website
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RE: tire pressure ? - 11/11/2006 9:12:58 PM
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BmX
Posts: 128
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40 is way to much man! I run 35 on my tires and it rides just fine. 50 Max psi is what the tire can handle, but that doesn't mean you should use 50 max on your mustang.
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1997 GT Vert 5spd
Not stock, but very slow
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RE: tire pressure ? - 11/11/2006 11:35:48 PM
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bullitt15
Posts: 349
Joined: 10/5/2006
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how about the kumhos in my sig? i started at 32 which is in the tire sticker in my car. max inflation is 51psi. at 32psi its allready bumpy, i cant imagine 51!
so 32 -36 psi is good? what about on roadcourse racing, higher?
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Bullitt #15
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