Originally Posted by
djben
The speed limiter is accurate I'm sure, but flawed. It does not affect 5th gear in the E46 M3, so you can redline it without a fuel cut off. Hit 6th gear and you will slow down as the engine cuts throttle to limit you to 155.
With the linear hp/torque delivery of the new V10s the new M5 and M6 aren't going to 'feel' as fast as cars that have a rush of torque earlier in the RPM range -- same with my M3.
When you are cutting a hard corner at 100-130mph (turn 17 and turn 1, Sebring) and applying throttle it is a lot easier to be accurate if you have a linear power band.
Interesting about unlimited in 1st-5th gear. I wonder if that has anything to do with the SMG; do the DME and the TCU communicate in that regard? I'd imagine so.
I can see why a linear powerband would be preferable in that regard, but I always go for street...basically my car goals are equal to the USCC that SCC magazine has yearly, except not using race fuel