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04-30-2010, 04:22 PM
I would suggest some tire testing. Go out cold 12 psi under your target of 40psi. Do 3 laps very consistently. Mark your lap times on your DAS system. pull in, check temps and measure your tire temps all 4 corners. This is hard to do in a DE and that is why race practice or test/tune days are much better with open passing. If your still low go out again. Repeat.
My response was really to say I would not advise recommending to others to run lower temps, especially a driver just starting out on R or slicks. Your more experienced and have a better skill set than someone new that could get in trouble with a car stepping out. I mentioned you have become confident with a certain setup. Just verify your results with a pyrometer and DAS to be certain that lower pressures are optimal. I would suggest some car setup may change that along with higher spring rates.
Start with the factory specs and get used to what should be optimal, then develop what works for you knowing your car setup inside out. I wasted a lot of time possibly years driving the car the way it was (wrong), until I spent the money properly on pro coaching. That set the car up correctly and changed my driving style to more curving and less forcing the car around the track.
I am not touting my accomplishment, but rather enforcing that if everything is dialed in the numbers should work. Answering your question about how did I know what worked. My fast lap(2) were lap 3 in race 1 and I ran higher temps (2 lbs) to get to speed quickly (middle of lap 1), then maintain a lead for the short sprint. Fast lap in race 2 was lap 18 (2nd from last) and that was done in traffic while battling for 1st. Ironically, I took 2nd, but was squeezing time each lap on P1 who finished 7/10th a second ahead. My pressures were at 40 because that is how they measured from testing for both race situations and track temps and when I came in from cool down (39psi, minus 1 lb). I am not even that good at setup. Larry Herman is much better at sweating the details. It may be years before I can really know the car, but tire I do understand now having run a bunch of combinations.
My response was really to say I would not advise recommending to others to run lower temps, especially a driver just starting out on R or slicks. Your more experienced and have a better skill set than someone new that could get in trouble with a car stepping out. I mentioned you have become confident with a certain setup. Just verify your results with a pyrometer and DAS to be certain that lower pressures are optimal. I would suggest some car setup may change that along with higher spring rates.
Start with the factory specs and get used to what should be optimal, then develop what works for you knowing your car setup inside out. I wasted a lot of time possibly years driving the car the way it was (wrong), until I spent the money properly on pro coaching. That set the car up correctly and changed my driving style to more curving and less forcing the car around the track.
I am not touting my accomplishment, but rather enforcing that if everything is dialed in the numbers should work. Answering your question about how did I know what worked. My fast lap(2) were lap 3 in race 1 and I ran higher temps (2 lbs) to get to speed quickly (middle of lap 1), then maintain a lead for the short sprint. Fast lap in race 2 was lap 18 (2nd from last) and that was done in traffic while battling for 1st. Ironically, I took 2nd, but was squeezing time each lap on P1 who finished 7/10th a second ahead. My pressures were at 40 because that is how they measured from testing for both race situations and track temps and when I came in from cool down (39psi, minus 1 lb). I am not even that good at setup. Larry Herman is much better at sweating the details. It may be years before I can really know the car, but tire I do understand now having run a bunch of combinations.