I've been searching the forums and I know the veterans of this forum will see my post count and grill me for failing to search the forums for all the valuable discussions... Well, I've tried and failed to locate any discussions about tire pressure.

What I'm curious about is, what tire pressures people are running on their stock IX tires? For example, do you follow whats on the door for daily driving, or do you go above for better millage? For performance driving, drag or auto cross, what tire pressures are people finding work best?

 

drag they say lower the psi a few if your spinning... i have no experience in this so i dont know how true this is....

for daily go about 35 psi all around. setting psi stated on the sticker will prematurely wear on the sides. 35 psi in my 3 years of evo experience is a good balance of gas mileage, even tire wear, good sidewall stiffness.

autox you should raise it by 2-3 psi from there

 

On the street I run 32psi front, 34 psi rear, cold tire pressure. At the track I try to run 42/42 psi as measured right after each session (ie. hot).

If you're worried about tire wear, or if your tires are wearing uneven, get an alignment.

l8r)

 

Street 35 F and 35 R ... lower for more comfortable ride
Auto-x 40 F and 41 R ... raise or lower based on wear pattern or desired handling characteristics

 

^ Is that cold tire pressure or warm tire pressure for street use?

l8r)

 

You are not going to gain as much pressure on the street unless you drive too aggressively or your alignment is out of whack, so those numbers can be used as cold ...

 

I gain anywhere from 4 to 8 psi on the street - depends on the day (i.e. weather) and my mood .

l8r)

 

I would think having your tires so high pressure would reduce your grip(smaller contact area)? But it seems all of you run higher than factory recommendations.

 

OEM psi recommendations are even stated by the founder of skipbarber the recommended psi is too low...

probably to consider the average joe doesnt really know how to react quickly w/ countersteer if situations get slippery when wet. huge safety margin is what mitsu designs into the evo, please dont forget this and dont go by the recommended psi if u want even wear and good steering responsiveness

 

+1

 

for stock tire (advans), i run 36 psi front and 34 psi rear (0 - 5k mileage). until now at 19k, i run 40 psi front & 38 psi rear. thats for daily driving.

 

i run 32psi cause here in missouri its like 100 degrees hot humidity!

 

I ran 35 fr and 32 rr,cold inflated on both my evo,s. Tires wore perfect,the car handled great and rode great. The alignment of course had 90% to do with the even wear,but incorrect pressure will make a tire wear the wrong way also. Also wear i live (smooth roads) had to do with the great ride.If i lived in the city i would run more like stock,(32f,29r).Remember more in the front and less in the rear gives you more oversteer,which is what you want.

 

35f 33r

 

on the OEM tires i like to run about 34 - 35 front and 31 - 32 rear when cold.

i usually don't touch it for autocross either. the sidewall stiffness is such on the yokos that the sides don't roll much at those pressures. anything more just seems to lose me grip.

play around a bit though and find what is comfortable for you. just keep in mind that the suggested pressure on the door will cause the front tires to cup pretty regularly with hard cornering and wear the inner and outter edges of the tires down alot faster than they should.

also, rotate them regularly front to back (and if you're feeling froggy get a tire shop to pull them off and rotate them side to side), because the front camber/toe tends to eat the inner edges of the tires.

i just got about 8k miles off my stock set of advans using this "system", and that is with about 14 autocrosses, 2 time trials, 1 time at the drag strip, and my usual spirited daily driving. so i am pretty happy with that. they were worn down all the way to the wear indicators, but the wear was nice and even over the tire surface.

the set on my first evo i left at the suggested pressure and the fronts cupped so bad they were almost at the threads in only 6k miles, while the middle of the tires were almost full tread.