View Single Post
      11-19-2013, 09:32 AM   #61
Brosef
Brigadier General
Brosef's Avatar
United_States
872
Rep
3,446
Posts

Drives: F90 M5
Join Date: Aug 2009
Location: Chicago

iTrader: (4)

Quote:
Originally Posted by JoeFromPA View Post
In regards to redline:

For such a group of enthusiasts, I'm surprised people are so easily fooled by redline on a tachometer. I've now owned several cars with a redline set ~300-400 rpms below fuel cutoff and where the true danger zone lies.

We don't yet know the true revving capacity of the S55. We also don't know where the turbo tapers off. Perhaps a 7600 redline indicates a top end of the powerband and a good end to shift, while fuel cutoff occurs at 8000 rpms.

A high-RPM track built 3.0 liter inline six has a lot of room to rev. Let's not say we know the true rev limiter under we find out.
it's not so much the redline people are concerned with as it is the torque curve falling off. we know it does fall off (probably starting somewhere around 6,000 RPMs). we know this both from the cartoonish dyno charts BMW provided as well as the torque figure (as an example, if the engine made its claimed peak torque figure, ~370 lb-ft., at 7,000 RPM, the engine would be making 493 hp) .
Appreciate 0