pi5tolpete

I have just swapped out my 16" cup wheels on my 91 cab for a set of 993 Targa Speedline wheels, 7-17 on the from and 9-17 on the rear.
The tires are continental sport contact2 tires at 205-50-17 front and 255-40-17 rear. MY OEM wheels and car pressure stamp says 36 psi front and 44 psi rear.

What pressure do I run with the 17" wider tires?

crg53

The general consensus is 36 psi all around for every day driving. I did some experimenting and settled for 35 psi.

pi5tolpete

Ok, seems to jive with what the PO thought it should be.
Thanks!

swftiii

Porsche had defined it to be 36 with a TSB or some bulletin at some point.

-Skip

BGLeduc

TSB #4440

The copy I have is dated 1/23/2004

Brian

92C2Targa#119

Peter:
Great to hear 35 lbs is correct. How do they look on? Hope to see them mounted and on the road.
Walton

Andy Roe

For 17" wheels, 36psi all round. For 16" it's 36 front and 44 rear as per the sticker.

pi5tolpete

Walton,

Wheels look good and feel fine. I'm happy. Thanks!

Gus

It is interest to note that different tires require different pressures.
I have run several different tire brands over the years and has e used varied pressures from 28 lbs to 36 lbs. to check that you are running a good pressure use a pyrometer to check tire temp across the width - front and rear - you are looking for an even read. If inside is hotter - too mch pressure , if outsides are hot not enough.
There is a lot more to this , but these as basics should work.
You can grab a pyro for around $50 USD

crg53

Or it could be too much negative camber.