Quote:
Originally Posted by reallyreallyslow
It is impossible that BMW bins the N20 such that if an engine makes <245hp, it is a 20i or if an engine makes >245hp, it is a 28i.
This is because...20i and 28i ARE DIFFERENT ENGINE.
While many MAY think and claim that the 20i and 28i are exactly the same engine, bulk of the 20i around are on 11:1 compression ratio. 28i are 10.1:1. These engines have different part number.
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They're identical in terms of design, the only difference is the variance in terms of quality. What determines the different part numbers? Not the design in this case.
The part numbers of the short engine is identical & it's only the earlier 320i's that have different turbos.
The compression ratio is different on the F30 but on the E84 & F25 they're the same. The tuners do not make a distinction between either "versions" of the engine.
The full engine type numbers of the 20i & 28i are N20B20U0 & N20B20O0. The N & U only signifies the state of tune & there's nth to suggest they're different in any sense.
It isn't simply limp mode on the 20i or anything cos so far ALL tuners managed to get only around 220ps from the 20i. None have to far reached the stock output of a 28i.