Tire pressure for track day, what is recommended for stock size tires with stiff sidewalls (RE070)?
07-23-2007, 04:48 AM
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Re: Tire pressure for track day, what is recommended for stock size tires with stiff sidewalls (RE07
Last time I went to the trace I had stock wheels on and IIRC the instructor told me to runn 45ish up front and 40 in the rear.
07-23-2007, 06:23 AM
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It really varies on the track and temp. You should be at about 45 psi hot. I ususally....
When I ran with S03's at the track, I would start at about 34 cold and go out for a session. Come back in and check the pressures hot. Anything over 50 psi is bad. 45-50 was my sweet spot for S03's. The cold pressures will be different from tire to tire, but the hot temps should be close to equal all around.
I also use the "sidewall roll-over" to fine tune.
I also use the "sidewall roll-over" to fine tune.
07-23-2007, 05:37 PM
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You guys are running 45-50psi hot?!
Holy crap that's alot of pressure! Waaayyyy too much.
You want to see around 39 to 40 psi hot. If it's a hot day, start the tires off at around 27 psi in the front, 30 psi in the rear.
You want to see around 39 to 40 psi hot. If it's a hot day, start the tires off at around 27 psi in the front, 30 psi in the rear.
07-23-2007, 10:49 PM
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Ok, I just came back from track. WHAT A GREAT DAY, tried different tire pressures, details inside...
Tires: Bridgestone RE070 (STi stock tires)
Size/Wheels: 225/45/17
Alright, didn't get my answer here, but searched a bit... so decided to set rears a bit higher than front (cold) to get less grip in rear. In the morning before I left, I set rears to 38 and front to 36.
Day stared rainy/cool and slowly got dry/hotter and last session was all dry.
First complete wet session, front was bumped to 40psi, rear 39... so I kept it at the same pressure (it was a slow session), then 2nd session it was drier, a lot more speed... rear was bumped to 40, and front to 42 psi!
I felt I needed a bit more front grip, so I reduced the front by 2 psi to 40 (hot)... next session it felt great, and it came at 40/40 and I left it alone at that and last session which was the fastest and hardest that I drove bumped the rear to 41, and front to 42-42.5.
I don't think more pressure would have been good at all and I probably could have got away with less... these tires have very stiffl sidewalls and I don't think need to put that much pressure.
Here are some pics of the tires close up after all 4 sessions!
front left:
<img src="http://www.members.shaw.ca/ajdar/left_front.jpg"><br />
front right:
<img src="http://www.members.shaw.ca/ajdar/right_front.jpg"><br />
rear left:
<img src="http://www.members.shaw.ca/ajdar/left_rear.jpg"><br />
rear right:
<img src="http://www.members.shaw.ca/ajdar/right_rear.jpg"><br />
Size/Wheels: 225/45/17
Alright, didn't get my answer here, but searched a bit... so decided to set rears a bit higher than front (cold) to get less grip in rear. In the morning before I left, I set rears to 38 and front to 36.
Day stared rainy/cool and slowly got dry/hotter and last session was all dry.
First complete wet session, front was bumped to 40psi, rear 39... so I kept it at the same pressure (it was a slow session), then 2nd session it was drier, a lot more speed... rear was bumped to 40, and front to 42 psi!
I felt I needed a bit more front grip, so I reduced the front by 2 psi to 40 (hot)... next session it felt great, and it came at 40/40 and I left it alone at that and last session which was the fastest and hardest that I drove bumped the rear to 41, and front to 42-42.5.
I don't think more pressure would have been good at all and I probably could have got away with less... these tires have very stiffl sidewalls and I don't think need to put that much pressure.
Here are some pics of the tires close up after all 4 sessions!
front left:
<img src="http://www.members.shaw.ca/ajdar/left_front.jpg"><br />
front right:
<img src="http://www.members.shaw.ca/ajdar/right_front.jpg"><br />
rear left:
<img src="http://www.members.shaw.ca/ajdar/left_rear.jpg"><br />
rear right:
<img src="http://www.members.shaw.ca/ajdar/right_rear.jpg"><br />
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