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      02-13-2020, 02:36 PM   #1469
Red Bread
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Drives: Smog machines
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Quote:
Originally Posted by XutvJet View Post
Quote:
Originally Posted by Red Bread View Post
Never seen a stock N55 hold power up high. This is base to base, you should see similar comparisons to the 1M vs M2 non comp curves too. The S55 and S58 clearly don't have these shortcomings.

[IMG]https://cdn.bmwblog.com/wp-content/u...N54-vs-N55.jpg[/IMG]

[IMG]https://cdn.bmwblog.com/wp-content/u...ue-750x500.jpg[/IMG]
Those aren't the dyno graphs of the 2014+ N55s. The early non-EWG N55s have smaller turbos. Although BMW kept the power rating the same, there's a difference in stock power and the shape of the curve between the pre-2014 and 2014+ N55s. The EWG N55s can make 390-400whp/400-420wtq on 93 whereas the non-EWG variants are limited to around 360whp/380wtq plus they lose power above 5600rpms.

https://www.2addicts.com/forums/show...8;postcount=74

https://store.vacmotorsports.com/vf-...35i-p4585.aspx

https://f87.bimmerpost.com/forums/sh...8;postcount=30

Tunes simply elevate the curve and power still tends to peak between 6000-6200rpm.
Okay, so for what, a model year and a half, the N55 wasn't as bad? Then it got replaced with the B58. I doubt anyone misses it. And it took them 9 years to get around to making it at least equal to the previous N54. Imagine if they'd just continued to develop the better motor?

You asked why the opinion remains that the N54 was better. For the great majority of the N55 run, the N54 was a better lump. I don't own either now, don't really miss either. I'd take a goofball, please shim my valves again, S54 over either.
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