Quote:
Originally Posted by b92
The E92 335ix comes with two engines, N54 and later the N55 which was used in the next gen 335i/435i as well. The N55 is the mature N54 - more reliable, smoother powerband, better exhaust note. Stage 1 tuning isn't expensive, however it doesn't have the same power potential as the N54.
The N54 is the fan favorite since it's a true twin turbo and it doesn't take much money to hit >350whp on the dyno. It also has the potential to easily exceed 600-700whp without having to touch the engine's internals. The N54 is a maintenance queen though, HPFP, injectors, spark plugs, waterpump, turbos, etc.
Some other fun notes about these two engines:
- N54 was replaced by the N55 in 2011, however BMW chose to use the N54 for the sportier 335is (2011-2013)
- A higher output variant of the N54 was used in the 1M (IMO the greatest car produced by BMW)
- A higher output variant of the N55 was used in the M2 up until recently, being replaced by the S55 from the F80/F82 M3/M4
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Thanks for the info. Yeah have heard the N54 can be a maintenance pig. I have read that need to carefully check maintenance records and see if some of the problem areas have already been addressed.