Quote:
Originally Posted by Thurman Murch
How well does this engine rev through the range? The N54 seemed to have instantaneous power down low and lost lungs up top
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It fell flat on its face at top because the car was tuned exceptionally rich from the factory and pulled boost at high RPM.
Let me tell you that once a N54 car is tuned properly it can pull very hard all the way to high RPMs. I am no fan of the comatose ride and driving experience of the 335i but that engine is an absolute gem.
I want to see the technical specifications of the S55 turbo vs the N54 turbo. My guess is that the S55 turbo is smaller, spools faster, is more efficient, but cannot flow as much as the N54 turbo which I believe was good for up to 400 whp if i am not mistaken. I do not think that the S55 turbo will be capable of that much power over stock and I would expect that there is going to be a healthy market for plug-n-play turbo upgrade kits for the F80/F82.