high air pressure

[poor boy]

run asphalt 1/2 mile banked running low air in the teens on both sides has anyone runned higher air say in the 20 to 30 range

[car62]

alot depends on the tire itself and what the manufacture calls for as starting points if it is a racing tire...but your tire temps will tell you if you need more or less air...i always start at 18 on left and 28 on right if its a racing tire..then i will go run 10-12 hard laps,and have my pit guy take temps and we adjust air pressures according to temps..for the most part we end up with:

LF-18 RF-28
LR-20 RR-26

on DOT street tires such as the Falken Azenis i usually end up running higher pressures such as:

LF-24 RF-38
LR-22 RR-36

[84Dave]

Car62 is spot on! Use a good pyrometer & measure the surface temps in (3) places across the tire surface immediately after a practice session. Another item to measure and record? The change in tire PRESSURES. We put a short strip of colored duct tape just above all tires on the body. With a decently accurate pressure gauge & felt-tip pen, record all COLD tire pressures before you hit the track for a practice session. Then immediately after a good, hard practice session, measure the HOT tire pressures & record on the tape. The recorded increase in tire pressures, cold to hot, will tell you how hard each corner of the chassis is 'working'. On our Pro-4, with a well-balanced/handling chassis & 10" Hoosier 'slicks', the tire pressures cold-to-hot will increase 3#-4# on the left side & 5#-6# on the right side. Bottom line? HOT tire temps and cold-to-hot tire pressure change will tell you a lot about how the chassis is handling, even if the chassis feels pretty good in a short practice session. But get the temps & pressures correct, & the chassis will still handle well @ the mid & end-point of a race........... where it really counts! And the 3rd item in your tool box should be a tire durometer to also check/monitor the hardness/softness of the surface rubber. If your tires are near the end of their useful lives, the surface rubber will be hard even after a hard practice session. And the chassis likely won't handle well. -Dave-

[stock car driver]

run asphalt 1/2 mile banked running low air in the teens on both sides has anyone runned higher air say in the 20 to 30 range



What tires?

Radials or racing tires?

[poor boy]

running hoosiers

[car62]

Hoosier what...F-35...F-45...Commanche...etc...?