Quote:
Originally Posted by Toome
FBO N55's will see around 380 whp on an E30 blend compared to around 420 whp with an N54. The biggest difference between the two motors is low end torque. Obviously the N54 makes more top end power, but it does not have the same initial punch that the N55 does. I have driven 335's with N54's and N55's and that has been my observation. One thing to note as well is BMW changed the HPFP to a plunger style in 2012 on N55's that does not flow as well when you start running E85.
N55's have proven to be more reliable than N54's so far, but aren't without their problems. N55 fixed wastegate rattle and a few others that I can't think of at the moment, but issues like the electric water pump going out and OFHG replacement still remain.
Even so, if you are proactive and not reactive about maintenance on these engines, you will have a good owners experience.
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What’s needed to run ethanol if you don’t mind me asking?