Rpm Limiter in 6th gear ?? - Page 2 - The Unofficial BMW M5 Messageboard (m5board.com)

BlueBiturbo · 10th May 2001, 14:02

Quote:

Originally posted by BlueBiturbo:
Thus, to go to 400 km/h you need:
(400/290)^2 x 400ps = 1050 ps.

Should be:
(400/290)^3 x 400 ps = 1050 ps

kgk · 10th May 2001, 14:34

Quote:

Originally posted by BlueBiturbo:
I always use a simple rule of thumb. If you wanna go faster, you must have x^3.

Yeah, right on!

If

v=old max speed
p=old max power
V=new max speed
P=new max power

Then

P/p = (V/v)^3

This is most useful in the form that you suggest,

V = v * cubeRoot(P/p).

So each time you double the power you only go 26% faster than you did before.

Now I've gotta run to the airport....

BlueBiturbo · 10th May 2001, 14:45

Quote:

Originally posted by kgk:
[b]
So each time you double the power you only go 26% faster than you did before.B]

Correcto, Sir.

Taffy

BlueBiturbo · 11th May 2001, 01:59

According to several sources, the true measured top speed for a standard 400ps M5 is 290 km/h.

Thus, to go to 400 km/h you need:
(400/290)^2 x 400ps = 1050 ps.

Almost similar to your calculation on 1100ps

Cheers,
Taffy