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View Full Version : tire pressures..whatcha runnin


sesolcSTI
10-15-2005, 08:54 PM
Just thought i would bring up the age old question of what people are runnin tire pressure wise. Include tire size and pressure. And if you change your pressure for anything, i.e. normal driving, autox, dragracing, etc. Lets hear em. :mrgreen:

SpendOne
10-15-2005, 09:05 PM
225/50/16 here....I run 40 psi on street driving...20 psi on the track. Dont seem to make too much of a difference on my 60' though.

ho1ywars
10-16-2005, 12:53 AM
225/45/17 at 38

Silverfc88
10-16-2005, 01:07 AM
235/40R17 Front @ 36psi

245/40R17 Rear @ 30psi

Just checked and this is for street. Running this tire pressure has helped me reduce some understeer.

M/T Drag Radials @ 20psi, but I plan on trying them a little lower at some point.

sesolcSTI
10-16-2005, 01:26 AM
Sweet! I just checked mine, i thought they were alright, my fronts were at 22 and 16! :eek: Manufacturers recommendation on the fronts with 225/45/17's is 36! :eek: and yes that is the pressure labeled on the door sill, not the max pressure on the tire itself. Now im all back to normal and good to go. They looked like they were good to me, heh....shows how much i know! :lol:

WhiteXFire
10-16-2005, 01:37 AM
255/35ZR19 in the rear and 225/40ZR18 in the front...recommended is 36, i usually try to keep it around 36-40 because damn low profile tires always look low to me!

xEJ20x
10-16-2005, 01:59 AM
30 psi all around.
But I'm due for a rotating or some new treads. :devil:

1988 Olds
10-16-2005, 09:41 AM
255/60/15 in rear and 235/60/15 in front. All about 35psi

Raven18940
10-16-2005, 11:16 AM
225/45/17 about 35. Up to 40 gives sharper steering and firmer ride, but grip is noticably reduced. 30 feels and comfy, maybe I'll use it when I put a sport suspension on.

99SL2_Modder
10-16-2005, 12:25 PM
Not like anyone cares cause my tires are so thin...

205/50/16 BFGTTA's at 35. Traction is great at that psi.

Little G
10-16-2005, 12:27 PM
235/45r17.......32 psi

ITSTOCK
10-16-2005, 12:31 PM
275/40/17's Eagle F1's in the front at 32#'s
275/40/17's MT ET Street radials in the rear at 16#'s (on the street for daily driving or at the track).

blkbomber01
10-16-2005, 01:18 PM
depending on what kind of tires (slicks, street slicks, etc... dont count) you should run how much it says to in the door jam. thats what i was always told

Bizee
10-16-2005, 04:13 PM
depending on what kind of tires (slicks, street slicks, etc... dont count) you should run how much it says to in the door jam. thats what i was always told


you were sadly mis informed.. people change the pressure in their tires to get different effects from them, such as better launch, better handling etc.. tire pressure believe it or not is a major tuning point in your cars performance..car might not hook for ****.. drop the pressure a little and it may hook right up.. all a part of test and tune..

you just generally do no want to exceed max pressure recommended by the manufacturor

US_R33
10-17-2005, 03:40 AM
on my Spec had Falken Azenis RT-615s 33-35psi on the street front and rear and when I autoxed i ran 48psi front and 43psi rear

US_R33
10-17-2005, 03:41 AM
you were sadly mis informed.. people change the pressure in their tires to get different effects from them, such as better launch, better handling etc.. tire pressure believe it or not is a major tuning point in your cars performance..car might not hook for ****.. drop the pressure a little and it may hook right up.. all a part of test and tune..

you just generally do no want to exceed max pressure recommended by the manufacturor
similar idea for autoxing as well

you run MUCH higher pressures in order to get the sidewalls to stiffen up that much more, thus preventing the tire from ROLLING the sidewalls=slow times and maybe bent rims

WhiteFiveO
10-17-2005, 12:43 PM
Bizee what do u know u dont even have enough hp to spin ur damn tires so u could care less about ur pressure stupid 4cly open header mustang

US_R33
10-17-2005, 01:37 PM
Bizee what do u know u dont even have enough hp to spin ur damn tires so u could care less about ur pressure stupid 4cly open header mustang
oh sh it....Mustang on Mustang violence :rofl:

Bizee
10-17-2005, 01:47 PM
well i wasnt going to go here and i apologize because this was a informational thread for those who were not familiar with the topic or looking for input.. however..


wtf does that say about whitefive0's car if he cant even keep up with me...only way that ****box is keeping up is if his car is being trailored by a 10sec vehicle...its not a 4cyl anymore ive had a busy 2 weeks slomo..

2point4DSM
10-17-2005, 05:16 PM
On the Pilot: 235/70-16... Bridgestone H rated tires, I run 40 psi all around. It causes the car to ride a little rough and makes a lot more noise but I corner harder than Honda's average Pilot owner and wear the edges quicker so by inflating them more I'm trying to balance the overall wear of the tires. Not to mention, lower rolling resistance = better gas mileage.

Considering max pressure is 44 psi and the temp rating on the tire is an A it seems to be ok. Of course, I try to check the tires every time I get gas to make sure there are no signs of bubbling or sidewall fatigue. Also, there is plenty of sidewall so I have no problems keeping wheels straight with that pressure.

On the Saturn: 205/50-16... Firestone H rated tires, I run 35 psi all around. Same principle as the Pilot. But with shorter sidewalls I have to worry about bending wheels.

On the Eclipse GSX: 225/55-16... BF Goodrich V-rated tires, I run 26 up front, and 32 in the back, when it use to be a daily driver. Why? I use to run more pressure up front but due to a heavier weight bias up front I was bending wheels. OEM wheels would bend lips frequently. Aftermarket wheels would eventually wobble and shimmy. Also, even though the car is AWD, during a hard launch, there was still a tendency to smoke the front tires, as the car squatted aggressively.

At the track, btw 16-19 up front seems to do the trick with these tires, depending on the temps. Good enough to break driveline stuff, that is. Again, I try to run a bit more in the rears, 22-26 cause they need less traction.

And if I start at 19 when the tires are cold, they will usually rise to about 26 after a 1/4 mile run.

The tire still seem to wear pretty evenly. That is probably because of the nature of the car, lol.

-Also, compared to high performance tires, all season tires will actually hook better at the track when temps get really cold.

-And, softer sidewall tires will actually leave a bigger foot print than harder/higher performance V/Z-rated tires.

Tire pressure tech is one of my favorite subjects.

The Basics 101:
- Never inflate tires past the TIRE manufacturer's max inflation pressure. This can cause the tire to explode. ex... My dad used a cheap air compressor to inflate Dunlop V-rated tires on an 86 Supra, with stock sized tires. The gauge was way off and instead of inflating them to 32 psi he had actually inflated them closer to 50 psi. One of the tires lasted about 100 miles before it exploded on I-95. The sidewall probably bubbled at first and then blew out.

- Running tires with low pressure causes them to heat up more due to rolling resistance and will cause then to fail. ex... Ford/Firestone fiasco. Of course, each company blamed the other. But in terms of tire safety we ultimately learned, the hard way, that on a vehicle that weighs a lot, running around with 26 psi, on medium grade tires, will cause them to fail.

Every tire is a built a little differently though and can handle temps better than others. This is noted on the sidewall. And some tires can handle running with very little air pressure longer than others, dependent on the vehicle weight.

US_R33
10-17-2005, 05:33 PM
so what can we gather from this discussion on tire pressures?

don't run ANY that any of us have suggested lol. inflate the tires to the manufacturer's recommended pressures (even if you're running 18s on a car that came with 15s) and then play with the pressures from there. try inflating the fronts higher than the rears, the rears higher than the fronts, all 4 higher than factory spec.....just remember to NEVER inflate them higher than the MAX psi on the tire sidewall ;)

see what feels best to you and run that......continue to check for adverse tire wear i.e. middle of the tread not wearing evenly with the edges

Late,
Daniel

blkbomber01
10-17-2005, 06:25 PM
you were sadly mis informed.. people change the pressure in their tires to get different effects from them, such as better launch, better handling etc.. tire pressure believe it or not is a major tuning point in your cars performance..car might not hook for ****.. drop the pressure a little and it may hook right up.. all a part of test and tune..

you just generally do no want to exceed max pressure recommended by the manufacturor
i was saying for regular driving... im an x-mucsle car guy and i know how to play with tire pressures to get what your looking for (better launch, handling etc...). i guess i didnt read the post thoughly :)

PSI Chick
10-18-2005, 06:07 PM
225/45R17, 38psi for the street. at the track, i use either 225/50R15 dr's @ 18psi or 26x9.5x15 hoosier dot slicks @ 8 psi.

htheduck
10-19-2005, 12:34 AM
35/35 street, track: BFG T/A KDW 2, Michelin Pilot Sports
42/48 autox: BFG T/A KDW 2

Silverfc88
02-26-2008, 06:34 AM
I'm running 34psi all around on my Blizzaks 205/55R16's.


I can't wait to get my summer wheels/tires back on. I'll have to play with pressures again though because I plan on changing up some things.

a-m-m
03-02-2008, 07:47 PM
I run 40+ front / 25+ rears for autoX. Exact pressure is dependent on the event.

Danronian
03-07-2008, 01:09 AM
For max fuel economy I run about 40 psi front/rear on my 175 75 13s.

Max sidewall is around 40, so I'm sure they're fine considering they don't wear much at all with a few degrees of camber on them and with only a 2k lb car, they shouldn't blow-out.

It yields me 43 MPG w/no highway driving, so even if tire wear is slightly accelerated, it's probably worth it.