Tire pressure discussion (affect on suspension travel, etc.)
11-01-2006, 08:05 AM
#1
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Tire pressure discussion (affect on suspension travel, etc.)
So, I filled up the tires (stock rims, Toyo T1R tires in stock setup) to 36 psi in the front tires and 34 psi in the rear tires the other day before my trip home. I found that they were at 40 psi from where the tire shop had gotten a little excited with the air hose or something. I wondered where the bouncing I had been experiencing was coming from, as on the drive down, the car's suspension had seemed bouncier than normal.
Anyway, I ran on the interstate at 36/34 for a while, and the ride was better, definitely. When I pulled over, I decided to check the tires in the warm/hot state. The tire pressure had risen about 4 psi in both the front and the rear. (No surprise to me, as heat would cause the air in the tires to expand.)
My question is two-fold. 1, did Audi intend for our cars to be running 36 psi in the tires or 40 psi in the tires? There's a big difference. I know that you are supposed to test your tires cold, but running at 80% or so of the rated max on the tire seems kinda high. Maybe it's just met.
2, how much does tire pressure affect suspension rebound/compression/feel?
Anyway, I ran on the interstate at 36/34 for a while, and the ride was better, definitely. When I pulled over, I decided to check the tires in the warm/hot state. The tire pressure had risen about 4 psi in both the front and the rear. (No surprise to me, as heat would cause the air in the tires to expand.)
My question is two-fold. 1, did Audi intend for our cars to be running 36 psi in the tires or 40 psi in the tires? There's a big difference. I know that you are supposed to test your tires cold, but running at 80% or so of the rated max on the tire seems kinda high. Maybe it's just met.
2, how much does tire pressure affect suspension rebound/compression/feel?
11-01-2006, 08:12 AM
#2
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If you look at the inside of your gas filler door it's says anything between 36 and 42 is okay.
It makes reference to how heavy the load you're carrying is but it really is personal preference. I personally run at 40 psi on all my tires. I don't like the floaty feeling I get when the pressure is lower than that. Plus, with the terrible road conditions we have, I'd rather run the higher pressure for a little more protection against pot holes.
11-01-2006, 08:28 AM
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I think the 36/34 numbers are cold numbers, so they assume that the hot numbers will be higher.
It's easier to test when cold, and not everyone will pull over on the highway to test their air pressure and then adjust with their portable air container.
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