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Originally Posted by karussell
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Originally Posted by JoeFromPA
Yes, I use MDM as a learning tool myself - so I totally agree with you. I actually just realized that i'm not redlining it nearly enough since break-in service was done....because I find myself so readily shifting early 
Good stuff on the fronts...if they look new, that speaks volumes about their ability to handle the front weight of the vehicle and I think 255 wide fronts are perfectly suited to this car.
You are probably right about tires, width, and power I'm not finding too many problems with daily traction (non track) with roll-on power application. So far I'm actually a better driver with smoother inputs on the f80.
Anyway, how do you feel about the spacers? Any changes to driving demeanor? I do like the look but historically not a huge fan of spacers, but I take your experience with some hefty weight, so I ask. |
daily traction of course there is no issue unless you want to have police lights and neighbors shaking their fists at you. 255 i agree are good size. 275 better. the e9x could heat up 275 fronts quite well. actually its most preferred spec is 275's squared. on the e46 it was 265 square. this car i think 275/295 would be very nice indeed. and also i think going up on the fronts will keep it proportionally neutral. just it will launch harder on late apex low speed turns. look at road atlanta's track map. turn 7. if you can get just 1mph faster on exit of that turn you can carry that faster speed for that entire damn straight. thats seconds off a lap time. and i think this change alone will net more than a 1mph gain. more likely 5-10mph using same tire compound. |
Enjoyed your review. .
I've been saying that these turbo cars need more rubber than what BMW is putting on them for a long time. Agree with you on the tire sizes for e46m3 as 265 square, e9x m3 as 275/35 square. While the e9x setup works pretty well, My 1M does even better with 285/30 square actually!
Keep in mind that your car has another 50-60 ft lbs of torque!
I threw a set of 315/30 meatballs on 11 " wheels in the rear of my 1M for autocross she really did well, and that's when I realized I finally wasn't spinning the rears!
Exiting Turn 7 you want as much mechanical grip as possible in order to get off the corner without wheelspin and to be able to put all the available power to the road, as soon as possible, I agree a 275/295 is a good start for the M4 but I bet 285/315 would be delicious on a set of apex or forgelines if you like.
As far as MDM, yes the American version is dumbed down , or at least it has been in the e9x and e8x. Hopefully some of the coders will have a euro version available. The euro MDM is what we should have gotten as well.
Enjoyed hearing about the adaptive suspension and where/Why it works best as I know the track well!