Tire pressure for jr1

Also depends on the size of the track.
Little bull ring tracks, you can get away with lower psi.
On big momentum tracks, I'd get up on air to help with roll speed. 7-9 is not out of line on big tracks. 5-6 on little tracks.
Then, if you need more bite to stick in the corners, do that chemically in the tires.


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Brian Carlson
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Thanks everybody the track we ran at last week was a bigger momentum track but of course it rained all night the night before and it was softer than expected but we started out on 5and 6 and went up after the track came in and we were fast all day but had an issue with the motor cutting out under caution and the track worker tried to crank it but pulled the choke on and flooded it out so didn't run but 2 laps of the main
 
What about banking? Wouldn't you want more air with higher banking?

General rule of thumb; what about the stopwatch? Wouldn't you want to keep adding air until the stopwatch times stop getting better? Just one more item in your bag of tricks!
 
What about banking? Wouldn't you want more air with higher banking?

General rule of thumb; what about the stopwatch? Wouldn't you want to keep adding air until the stopwatch times stop getting better? Just one more item in your bag of tricks!
First off he never mentions banking, and NO you don't go up in air just because of banking. If it's practice ya you can just keep going up in air, but for the race you only get one shot at it.
 
Of course you can disagree Al.

At the same time though, you might need to accept that 4 different people weighed-in with information based on their first-hand direct experience racing dirt ovals.

PM
 
What about banking? Wouldn't you want more air with higher banking?

General rule of thumb; what about the stopwatch? Wouldn't you want to keep adding air until the stopwatch times stop getting better? Just one more item in your bag of tricks!
When you only have 1, maybe 2 times on the track for practice, you need to know somewhat closely on what to do. Also, the track most of the times during practice, is or can be up to a second slower , than in qualifying or race conditions.
Experience, knowledge play key roles here.
 
When you only have 1, maybe 2 times on the track for practice, you need to know somewhat closely on what to do. Also, the track most of the times during practice, is or can be up to a second slower , than in qualifying or race conditions.
Experience, knowledge play key roles here.
That may be a key component that Al is missing....How quickly dirt tracks change compared to sprint tracks.
Personally, I would never even try to set my race air pressure based on hot laps / practice. Likewise with gearing. Sure, I would take into consideration the lap times and the track conditions, but nearly all dirt tracks will get faster (not slower) after hot laps. Most continue to get faster all night long due to a harder surface and better grip. We're always looking for that "extra tenth," but much of the time, the track can be "off" or even faster than usual by a full second or more. Of course there are exceptions, but dirt tracks are certainly less predictable than pavement tracks as far as grip and lap times changing drastically.
 
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