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Tire pressure for 205/60/15's '77 911S

What do you suggest for tire pressure for 205/60/15 tires on a '77 911S ?

Thanks for the input.
Old 11-07-2017, 02:42 PM
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I run 29 front and 32 rear.
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Old 11-07-2017, 03:27 PM
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Quote:
Originally Posted by ampex351 View Post
What do you suggest for tire pressure for 205/60/15 tires on a '77 911S ?

Thanks for the input.
What wheel widths are you running? Any mods to the car? Stock alignment settings? What tires? How do you drive the car? What does the owner's manual list for tire pressures?
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Old 11-07-2017, 06:15 PM
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Im running on 6" original Fuch's no modifications. 205/60/15 Vredestein tires. Manual does not list pressures for this size tire. I like to drive briskly/hard cornering. Any suggestions for tire pressure?
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The owner's manual for a '72 states 26 front, 29 rear and increase the pressure of the cold tire by 5 psi for speeds in excess of 125 mph.

For spirited driving you could use shoe polish to see if the tire is turning over on the sidewall and adjust accordingly.
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Old 11-07-2017, 09:33 PM
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Thanks very much Gordon....that was a HUGE help. Not!!
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205/60 is larger than stock, so factory pressures would not be correct. I always run 32/35. YMMV.
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Old 11-08-2017, 08:13 AM
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I have 205/65/15 and 215/70/15 with 35/39. Seems these modern tires like the higher pressures and perform much better than ever.

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Old 11-08-2017, 09:00 AM
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Gordon wasn't being smart. The proven technique is a little white chalk or shoe polish from the tread down the sidewall a little, then drive around some corners, easy or spirited and look at how far the tire leans into the sidewall. Then adjust the pressure accordingly.
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Old 11-08-2017, 09:31 AM
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I might say I have three pressures it use on my 72T. Around town, autox and track. All derived from the chalk mark.
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This tire pressure question comes up from time to time. I could tell you what pressures I run, but it won't be of any help to you.

Tire pressure is always a compromise between performance, tread wear, and ride quality.

For track and AX I use a temperature gauge to make sure my tread is heating evenly and adjust my pressure accordingly.

Around town, I run a little less pressure for a better ride and due to my cars negative camber the outer edge of the tread isn't doing much work.

When I used to drive mostly freeway, I would look at how the tires were wearing and adjust accordingly.
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Old 11-08-2017, 10:04 AM
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Quote:
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Tire pressure is always a compromise between performance, tread wear, and ride quality.
Personally, with the higher pressures (35/39), I have not noticed much if any difference in ride quality or tread wear but very noticeable increase in performance. Besides, I doubt there is much that can be done for the ride quality of a 911 anyway and probably not a priority for performance enthusiasts.


Cheers,
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Old 11-08-2017, 10:38 AM
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Besides, I doubt there is much that can be done for the ride quality of a 911 anyway and probably not a priority for performance enthusiasts.


Cheers,
Joe
True.

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