Does it ever stop??....plus de flap?

[0836whimper]

I had a normal M3 and the CSL at the same time for a while.

The difference in the sport button on the two was quite marked, the M3 was almost undriveable with Sport on, the CSL less sensitive. Also, the M3 seemed to provide more power lower down in the revs, whilst the CSL is more linear and the fireworks are further up the rev range. Had the effect on making the M3 appear more powerful, but obviously it's the other way round.

The M3 was an early 03 pre-facelift with the SMG logo on the gear stick housing etc, they might have revised the above soon after.

[terraphantm]

Originally Posted by 0836whimper

I had a normal M3 and the CSL at the same time for a while.

The difference in the sport button on the two was quite marked, the M3 was almost undriveable with Sport on, the CSL less sensitive. Also, the M3 seemed to provide more power lower down in the revs, whilst the CSL is more linear and the fireworks are further up the rev range. Had the effect on making the M3 appear more powerful, but obviously it's the other way round.

The M3 was an early 03 pre-facelift with the SMG logo on the gear stick housing etc, they might have revised the above soon after.

Pretty much all of the maps that deal with sport/non-sport are identical on the CSL and non-CSL; same throttle curves, same delta torques. Main difference is that the non-CSL doesn't have any provisions to deal with the flap.

So the difference behavior comes from somewhere other than how sport mode is handled. There are probably multiple things that contribute. Two things I can think of:

1) The non-CSL does make more torque down low for a given cylinder filling (particularly below 3000 RPM).
2) The CSL goes into open-loop at much smaller throttle angles than the non-CSL

[terraphantm]

Just wanted to update you guys with some info I've uncovered:

The CSL software changes the cylinder filling / volumetric efficiency calculation based on whether or not the flap is open, and it also alters the throttle map depending on the flap status. So if you want to run flapless, it's probably best to keep it open via software rather than just removing it altogether.

[digi]

kool find. thx.

[nw99]

Much appreciated