Quote:
Originally Posted by kmarei
But at least they put in a little effort in making them different
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Really?
And here I was under the impression thst the R&D money was spent on making the M engines produce more power and perform better while still being as durable and reliable than what they started with, if not more so.
For the S63, they switched from single scroll turbos to dual scrolls and developed a completely new induction system to decrease turbo lag. So this is not just an ECU tune at all. They also added Vavletronic throttle control to that engine before it made its way to the N63. And they did that even though redline was increased to 7200RPM, higher than previously possible.
For the S55 we already know they are increasing the number of turbos and raising the redline by even more vs the series engine. It's not going to be just an N55 with a tune - not even close. There is also strong likelihood of some innovative induction setup that addresses turbo lag - probably even more effectively than what was done with the S63.
If Valvetronic means better throttle response than ITBs, then that's what they'll use and indeed it would be foolish not to. If power goals can be met by keeping displacement unchanged (which stands to reason when forced induction is being used) then not increasing the bore size and having to switch to a heavy iron block is clearly the right choice.
If you are just looking for an engine that ticks the boxes on an arbitrary list of possible changes from some other engine, I'd say you've missed the point and misunderstood the engineering motivations behind previous M division efforts altogether.