First of all, this exact topic has been discussed a hundred times.
Quote:
Originally Posted by Imo135
why is there so much of a difference in claimed power increases between the 1M and the 135i N54 on a tuned flash?
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Quote:
Originally Posted by Imo135
AC Schnitzer says 360hp for the 135i N54 and 395hp for the 1M.... thats a big difference
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Because it's two different tunes. It's not the "same" tune on two different cars. ACS tuned the 1M slightly more aggressively because of the extra oil cooler and radiator fan. They probably felt that the 1M can deal with the extra heat generated by the more aggressive tune. There are plenty of tunes out there for the N54 that make more power than either the 135i or 1M ACS tune.
Quote:
Originally Posted by Imo135
BMW part numbers obtained from a dealer indicates the same size turbo's  |
troof
Quote:
Originally Posted by ianf2002
1M has same N54 as Z4 35is. Don't think the turbos are different or internals from stock N54, fly wheel and clutch are different.
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A while ago, I think someone found out that the clutch and flywheel (and crankshaft and piston rings and a bunch of everything else supposedly "upgraded" for the 1M) are the same parts as on 2010 N54 cars. However, I think some of the parts were upgraded between 2008 and 2010, such as the flywheel, so in a sense it is still "upgraded" from the 2008 N54 cars.