What should be the correct tire pressure?

[pearl_boxer]

It's all good man.

Sorry I can't help out here.

[baller_v24]

well those are the same size tires on the 06's and i looked in my owner's manual and it recommends 36 up front and 30 rear. i also have a tire guide in my car for tires in general and it say to use the recommended tire pressure located in the drivers side door jam as stated by nagyhead. im sure it's probably different for u since your engine is a 2.0 im sure u dont need as much tire pressure since it weighs less upfront.

[Big Sky]

36/30 that's interesting- quite a divergence front to rear, the 04 STi #'s of 33/32 were for the 215 tire and 7.5" rim- the common dominator is to run a little more presure front vs rear- the exception being motorsports applications where your trying to influence handling via pressures.

[baller_v24]

sounds odd to me also. i believe the 06's are 8 in wide. im stopping by the dealership tomorrow ill ask them while im there also.

[Big Sky]

I think the 05+ are all 8" and went to the 225 width

[jwtarbaj]

Originally Posted by Big Sky

I think the 05+ are all 8" and went to the 225 width

I'm pretty sure the 04 had 225s too.

Here's the differences from 04 to 05 given by Car & Driver

"There's a new limited-slip diff up front, new shrouding to clean up airflow beneath the car, aluminum lateral suspension links at the rear, a quicker steering ratio, wider wheels (8.0 inches versus 7.5), and a wider—by 0.4 inch—rear track."

[jwtarbaj]

I can't seem to edit my prev post so:


source: http://www.caranddriver.com/comparis...u-wrx-sti.html

[Big Sky]

Your correct- 225 width for 04 (and actually all of the "new age" STi's (01+) ) The 215 listed in the 04 FSM must be from the jdm/edm WRX which ran a 17x7 215 tire (as does the US 06/07 WRX).

Strayed a little from the orignal question

[Jubaru]

wait i have 17" ssr wheels and 225/45/17 tires and i run 40 psi all around....
is that bad?
the tires bend a fair amount also with this much pressure.
Dunlop SP Winter Sport 3D's

[jwtarbaj]

Originally Posted by Jubaru

wait i have 17" ssr wheels and 225/45/17 tires and i run 40 psi all around....
is that bad?
the tires bend a fair amount also with this much pressure.
Dunlop SP Winter Sport 3D's

Disadvantages of Overinflation

An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when encountering potholes or debris in the road, as well as experience irregular tread wear. Higher inflated tires cannot isolate road irregularities as well causing the vehicle to ride harsher and transmit more noise into its interior. However, higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures.


Source: Tire Tech Information - Air Pressure – Correct, Underinflated and Overinflated

[cbaSTI]

The recommended tire pressure for mine is 36/30 also but that is for the factory tire. Aftermarket tires have different ratings. Some of the tires I sell have a max pressure of 35psi and the tire I have is rated at 51psi max. I set mine anywhere between 35-40

[mosc]

The recommended tire pressure for an STi is not 36/30...

[cbaSTI]

According to my car it is 36 front 30 rear. Maybe its different because its a 2005

[BithellWgn06]

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