Go with throttle up! Max speed takeoff RPM ??? - The Unofficial BMW M5 Messageboard (m5board.com)

IvanDias · 21st November 2001, 15:24

Hi,

I am not a big fan of standing starts, especially given the strain the transmission must take putting 315-340bhp into overcoming the M5s heavy weight.

But ....

What do you find is the optimal RPM when you want a maximum acceleration blastoff, assuming a fair quality road/track and normal good road tyres, and the 255 rears as standard ??

Please state whether you have a 3.6 or 3.8, as surely these will have different results as the torque is higher on the 3.8, and what wheel/tyre sizes you are on.

Any particular technique works better than another?

Be safe !

Ivan.

dominik · 22nd November 2001, 09:45

Hi Ivan

From my experience with 3.6l / 235 overall I let it go at around 3800-4000 rpm and then about 80-90% throttle (IIRC). Gives a little wheelspin, but not too much. If you powershift you can have wheelspin also in second gear

Alan Archer · 23rd November 2001, 14:49

Well, firstly i'd like to say it depends on which tyres you have...but that really is another can of worms.

Eg, on michellins i could apply more revs than on the bridgestones i currently run.

As a rule, i would drop the clutch at around 2500-2700rpm, get a minimal chirp from the tires & you're off.
Anything over 3400rpm and you're in danger of spinning up too much and loosing the race.

I've run my car at santa pod raceway, and the best times i achieved were using about 2700rpm, and dropping the clutch quickly.
Best time was 14.1 @ 101mph which is spot on what the car will do.

This year i returned on Bridgestones & couldn't get good traction off the line at all....with times 2-3 tenths slower...

Finally i'd just like to say that i NEVER find the need to drop the clutch when i'm out on the road....a good reaction time from the lights is far far better for speed, and far less strain on the car

Regards,

Alan Archer

3.8 nurburging 255rear S02's