? FD alignment specs for 2.5-mile road course on slicks with manual rack ?
06-16-10, 08:41 AM
#26
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Fritz - at our last VIR event I was running 2 degrees on all four corners and at the end of the weekend the tires were showing signs of overheating on the outer shoulder. I will definitley be increasing the neg camber for next event.
For those of you running less than 2 degrees of camber, have you checked tire temps? There are a lot of track rx7s running "pettit" alignment recommendations then there are others who are running more extreme settings (over 2 degrees front and rear). I have just purchased a pyrometer and will be checking my temps during next event. If others have info on tire temps and would like to share, it would be greatly appreciated. If I get good data with mine I would be happy to share my results.
For those of you running less than 2 degrees of camber, have you checked tire temps? There are a lot of track rx7s running "pettit" alignment recommendations then there are others who are running more extreme settings (over 2 degrees front and rear). I have just purchased a pyrometer and will be checking my temps during next event. If others have info on tire temps and would like to share, it would be greatly appreciated. If I get good data with mine I would be happy to share my results.
I have a pyrometer now, thanks Keith
and I'll try to get some #s at the next event in July. My car hasn't been aligned in 3 years though (lol) and I'll be running some 285 30 18s which are much smaller than the 275 40 17s so my camber will go up a bit which might be a good thing considering what others are running.I love sliding the car around and from past experience if I go with lots of camber I'll cord the inside in a hurry. If I don't take it easy especially when it's hot I'll get the melted grove down the center of the tire in just a couple of days and if I recall the grove leans closer to the inside of the tire and that's with approx -2 front and -1.5 rear. When it's hot I'll also start at 22 psi on the hoosiers and try not to go above 35/36. I think me and Pete were starting at 24 to 26 at the last event when it was like 70 out. The corvette guys will sometimes start below 20 psi (heavier car with wider tire).
06-16-10, 10:59 AM
#27
I don't even know what my cold pressures were probably 24 or 22. Maybe less. I kept removing it to get down to 35-36 hot— and to be truthful, I was checking hots post run, so the actuals were probably higher and they kept coming back 37-38.
Camber is tough, because I don't want to run so much that it lunches my street tires, which seems to happen particularly on the fronts.
Camber is tough, because I don't want to run so much that it lunches my street tires, which seems to happen particularly on the fronts.
06-16-10, 01:03 PM
#28
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I don't even know what my cold pressures were probably 24 or 22. Maybe less. I kept removing it to get down to 35-36 hot— and to be truthful, I was checking hots post run, so the actuals were probably higher and they kept coming back 37-38.
Camber is tough, because I don't want to run so much that it lunches my street tires, which seems to happen particularly on the fronts.
Camber is tough, because I don't want to run so much that it lunches my street tires, which seems to happen particularly on the fronts.
If you drove on the street tires I'd worry about the camber but in the last two years you probably have more track miles than street miles
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