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 Appropriate tire pressure

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Shintsu
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Name : Shintsu
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PostSubject: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 12:43 am

I had noticed AA had been citing 35 PSI everytime he pointed out his MPG but I always thought our tires were supposed to be filled at 32 PSI?
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deekster_caddy
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Name : Derek
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 8:34 am

I've been running mine at 40 PSI lately. The only drawback is slightly lower traction but otherwise it rolls much easier. I can coast much farther than with the tires at 32 PSI.

I think our 'proper' fill level is 30 PSI. It's a comfort thing.

When I'm at the track I run 20-23 PSI for the extra traction. Driving for long durations at that low of a pressure is bad for the tire. Not enough internal support.
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AA
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AA

Name : Aaron
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 10:04 am

I use 35 PSI mainly to compensate for wear to the outer tread blocks during cornering. If I ran 30 PSI, I would see a lot more wear to the tires' edges. But because I drive long distances frequently, 40 PSI would wear out the middle tread more (for city it's no problem). Over time, I've learned to adjust the PSI for optimum tire wear with my car and driving style.

Everyone's car and tire set-up is different, so you have to watch the tread over time. If you don't see anything odd happening, I wouldn't change anything.

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
Mr.Riviera
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Mr.Riviera

Name : Matthew
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 10:31 am

i run 35 front and 38-40 rear for normal driving. helps with gas mileage and steering response. plus i tend to have the same wear "problem" AA does.
just be careful running 40 rear on the highway in the rain if your tires are not good.
i'd say for most drivers on this forum with stock 225/60/16 tires they should have them at 32-34, but again it depends on the tires and speed rating.

_________________
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily
Appropriate tire pressure Dsc_0110
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AA
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AA

Name : Aaron
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 11:20 am

My local Firestone, who I've been dealing with for a few years, will remount my tires about half way through their life, for free. What I do is rotate the Firehawks front to rear (directional tires) until all are worn about the same amount on the outside edges (fronts always wear faster). Then, once they're bald, I have all the tires taken off and remounted with the good edges out. I used to think this was because of misalignment, but it appears to be more a function of really hard cornering.

I can usually get 40k out of a set of tires. At the point I have them remounted, the middle tread is about half worn down. By the time both outer edges are bald, the middle tread has about caught up. The tire looks a bit like a racing slick at this point.

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
SuperRiv07
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SuperRiv07

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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 12:28 pm

I run 40 in mine to and it does roll nicer and coast farther
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deekster_caddy
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Name : Derek
Age : 49
Location : Reading, MA
Joined : 2007-01-31
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 1:13 pm

AA wrote:
I use 35 PSI mainly to compensate for wear to the outer tread blocks during cornering. If I ran 30 PSI, I would see a lot more wear to the tires' edges. But because I drive long distances frequently, 40 PSI would wear out the middle tread more (for city it's no problem). Over time, I've learned to adjust the PSI for optimum tire wear with my car and driving style.

Everyone's car and tire set-up is different, so you have to watch the tread over time. If you don't see anything odd happening, I wouldn't change anything.

My car has this wear too. I do a lot of city driving and corner hard. I wonder if we should ask for a little positive... ummm camber? Someone who knows alignments help me out here - I think we want like +1.5 degrees of camber over the stock setting, does that sound right?

Is it camber? Or caster... grrr. Basically we want the top of the front tires to point in a little more so the tires level out in cornering and wear more even.
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AA
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AA

Name : Aaron
Age : 44
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Joined : 2007-01-13
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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 1:23 pm

I thought about doing that, but would you see more inner wear with straight driving? Great for the track, or city diving, but what happens after a few thousand highway miles. I'm not sure, anyone know?

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
Because cool


'95 Celica • 152k miles • 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
deekster_caddy
Master


Name : Derek
Age : 49
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109

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PostSubject: Re: Appropriate tire pressure   Appropriate tire pressure EmptyTue Jul 29, 2008 7:27 pm

I've driven my car many thousands of highway miles, and many thousands of city miles. I think if it would have any negative effect it would just be wearing inside and outside together, and that can be overcome by running at a higher tire pressure!
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