Quote:
Originally Posted by Pete_vB
I think that's a good rule of thumb, but each case is different. The 1M runs particularly wide rims for its tires, likely to improve response- the rims are .5" wider than the M3's 18s running the same width tire. Thus even the 275/ 295 combo still falls inside the "recommended rim width" range of the stock rims. I think I'd lose a lot of transient response at that tire width, so slaloms, etc would be challenging, but I'd bet on peak grip being up.
Then there are weird cases. I can't remember- did you meet Steve, guy with the black Cayman S at SCCA nationals? He's stuffed a 315 Hoosier onto an 8.5" rim, might have been running it then, and testing shows it's faster. Undeflected contact patch isn't great, but it works.
As for my desire for front rubber, I'm concerned because I felt burned by the Dunlop Sport Maxx Race tires I tried. Stock sizes but I guess the front ran small, and I never did dial the understeer out with them on. Strange, but I don't want a repeat of that experience...
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On a rcomp you can over stuff and it works. On street you have about .5 or the wheel.
Yes, I meet him two years ago I think.
At the end of the day you just have to test.
The class rules mean you have to do dumb @#$% to get the car fast.
If I were just building a track day car, I would get some 18's that were .5 wider than stock and some camber plates to go on my d/a's and would probably have a fast fun car with 275/295 street tires.
I may just do it anyway.
Neil probably has the best track car setup at this point. I would like to hear his build.