Quote:
Originally Posted by M3Rad
If you cannot drop 4 secs between wider A6 and stock PS2 at an autocross (using a 60 secs course as a baseline), you might be under driving the A6. This is not applicable in the rain, so it is definitely surface condition dependent.
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The wider tires are probably worth 0.3 to 0.5 all else being equal.
You should try running both tires on the same car at the same event. Last time I did this the difference was a lot less than 4s. I have not tried A6s on the E92 M3 yet. I have tried race & street tires on the old E46 where the V700 (older Kuhmo) was about 1.9s faster than my street tires. On the elise I have measured the hoosiers as about 0.5s faster than the 048s (M). Now this is on one lot (fine grain concrete), test at a different lot and results will vary.
[edit] The last GRM tire test had:
Street Tires:
1. 42.984 Falken Azenis RT-615
2. 43.254 Falken Azenis RT-215
3. 43.287 Yokohama Advan Neova
4. 43.511 Hankook R-S2 Z212
5. 43.762 Kumho Ecsta MX
6. 43.855 BFGoodrich g-force T/A KD
Track Tires:
1. 41.008 Kumho Ecsta V710
2. 41.142 Hoosier A3S05
3. 41.217 Hankook Z214 C70
4. 42.428 Yokohama A032R S
The A6 is slightly faster than the A5, espically on camber challenged cars.