[ATX78703]

Originally Posted by cstavaru

It is not possible for an inline-6 engine to have two twin-scroll turbochargers. It would mean separating 6 cylinder outputs into 4 exhaust paths, which is impossible.

It would not be unconcievable for me that the next M3 would have one small twin-scroll turbocharger (for lag-free operation and powerful low-end) and one large single-scroll turbocharger for top-end power. They can also employ variable geometry turbine for the large turbo, to further optimize the power band. But I am not sure that this configuration can achieve a flat torque curve from like 1200RPM, because the large turbo has no way to begin spinning at that engine speed and the small turbo would have to provide all the torque until 2000RPM which would be quite hard to achieve. But who knows...

I was thinking the same thing. I'm not so sure they need a "flat" torque curve, however. they just need 300 lb-ft accessible @1200, then slam you with 400-450 lb-ft at about 2500 rpm. This would also make it easier to provide a more linear power rise, so that peak HP is coming more at 6500 instead of 5500, like some of the other turbos. I'm hoping for a 7500 rpm redline.