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You ran your last session yesterday at 4PM, you have adjusted pressures to a target of 30 psi hot, the ambient/track is 85/100.
The next day the race is at 10 AM, and temperatures are 70/85 at race start. When you check the tire pressures, they are LF 17.5, RF19, LR 18,RR 21 at 60/70 degrees.
What will you be starting the race at?
The temp differential between day 1 and day 2 is 85/100 and 70/80. If you use 1 psi per 10 psi of temp, this is relatively easy. You add 1.5 psi all the way around. The only reason to note the 60/70 degree notattion is becaus eit is a temperature reference, or you want to create a "set 2" for the race. There's no reason you can't use old tires and take the pressures from them to use on a new set, I usually do that to back up my numbers for accuracey.
So, to emphasize, the difference in psi is base dsoely on the difference in practice and race temps. The cold (60/70) is only there for a reference.
So..
LF 19, RF 20,5 LR 19.5. RR 22.5 will be your starting pressures at 70/80
The next day the race is at 10 AM, and temperatures are 70/85 at race start. When you check the tire pressures, they are LF 17.5, RF19, LR 18,RR 21 at 60/70 degrees.
What will you be starting the race at?
The temp differential between day 1 and day 2 is 85/100 and 70/80. If you use 1 psi per 10 psi of temp, this is relatively easy. You add 1.5 psi all the way around. The only reason to note the 60/70 degree notattion is becaus eit is a temperature reference, or you want to create a "set 2" for the race. There's no reason you can't use old tires and take the pressures from them to use on a new set, I usually do that to back up my numbers for accuracey.
So, to emphasize, the difference in psi is base dsoely on the difference in practice and race temps. The cold (60/70) is only there for a reference.
So..
LF 19, RF 20,5 LR 19.5. RR 22.5 will be your starting pressures at 70/80
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