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correct tire pressure for 17" tires?

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Old Sep 25, 2013 | 01:54 PM
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Default correct tire pressure for 17" tires?

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?
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Old Sep 25, 2013 | 01:59 PM
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The general consensus is 36 psi all around for every day driving. I did some experimenting and settled for 35 psi.

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Old Sep 25, 2013 | 02:00 PM
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Ok, seems to jive with what the PO thought it should be.
Thanks!
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Old Sep 25, 2013 | 05:07 PM
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Porsche had defined it to be 36 with a TSB or some bulletin at some point.

-Skip
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Old Sep 25, 2013 | 06:07 PM
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TSB #4440

The copy I have is dated 1/23/2004

Brian
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Old Sep 26, 2013 | 09:43 AM
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Default 17" Tire Pressure

Peter:
Great to hear 35 lbs is correct. How do they look on? Hope to see them mounted and on the road.
Walton
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Old Sep 26, 2013 | 09:53 AM
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For 17" wheels, 36psi all round. For 16" it's 36 front and 44 rear as per the sticker.
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Old Sep 26, 2013 | 10:27 AM
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Walton,

Wheels look good and feel fine. I'm happy. Thanks!
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Old Sep 26, 2013 | 12:35 PM
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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
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Old Sep 26, 2013 | 01:40 PM
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Originally Posted by Gus
If inside is hotter - too much pressure ,
Or it could be too much negative camber.

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