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940 Tire Pressure Question....

Solo

New member
Joined
Nov 28, 2009
I've just placed a set of tires (205/60/15) on a '94 945. Will I be able to keep the same tire pressure as a stock set of tires (185/65/15) @36psi in the rear and front? Do some adjustments if any need to be made? If anyone else is running this size of tire on their 940/945, please share your preferred tire pressure. Also as always any information is appreciated. If there is a faq/thread/post containing the information that I'm trying to acquire, please post a link or three that point me in the right direction. Thank you.
 
The tire says the recommended tire pressure. Besides that it is purely personal preference. Lower pressures make for more grippy tires and higher pressures give better mpg's.
 
cheap infrared thermometer...measure the tread on warmed up tyre
three places on the tread - CENTRE / 1.5" in on INSIDE / 1.5" in on OUTSIDE

looking for uniform temps..you have to HUSTLE to get this done..the MOST ACCURATE
(and the we we do it at the track) is to use a PIERCING PYROMETER PROBE
w/a "K thermocouple" in the "business end"..you can these pretty cheap as well.

http://www.longacreracing.com/articles/art.asp?ARTID=16

http://www.zorotools.com/g/00057029/k-G0651481?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&kw={keyword}&gclid=CLXjhMqU07YCFcfd4AodNE0AXw

http://www.joesracing.com/index.php?dispatch=products.view&product_id=829

from THIS :
http://sports.espn.go.com/rpm/nascar/icons/news/story?id=3395880
comes THIS QUOTE:
"When the Goodyear engineers take the temperatures of the tires they take three readings per tire. One reading is taken about an inch off of the inside edge of the tire surface, one in the middle and one about an inch off the outside edge of the tire tread. Those three readings on the right and left front tires will tell the teams if they have the proper suspension [primarily camber] settings and that the tires are properly inflated.

If, for example, the inside reading of a right front tire is hotter than the center or outside reading then it tells the crew chief that he has too much camber in that wheel. If it is too hot on the outside reading then he does not have enough camber. If both the inside and outside readings are hotter than the center then the tire is under inflated. Conversely, if the center of the tire is hotter than the outside readings then it is probably over inflated. Again, the goal is to have all three readings be the same or as close to each other as possible. "

and, *YES* it IS a "black art" (pun intended).....
 
^ ding. I once was told by someone at a tire store that he always inflated tires to the pressure on the tire; in this case it was 44 psi. I pointed out that this was clearly marked "max" pressure, and was not the 'correct' pressure.
 
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