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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N54 vs N55



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      04-15-2014, 05:27 PM   #23
e93driva
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Originally Posted by Allen@PTF View Post
In our testing we've found the N55 is an awesome engine that is somewhat hindered by a tiny turbo. FBO + E85 cars are good for ~380whp and TONs of torque(460wtq+.) On pump gas 350whp is doable.

Keep in mind that dyno numbers are subjective and can vary wildly. Find a nice, optimistic dyno and 400whp may be possible but that doesn't mean it's any faster than a dyno reading 380whp.
Hey 380whp is perfect. My n54 xi wasn't putting that much down!

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Turbo opions are also coming available. For $1k you can get your 400whp with the PTF stage 1. High 400's are possible for $2500. We should see 2 more stage 2 options coming out later this year.
Yeah if i end up wanting more power then i'll look into turbo upgrades

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I like the N55 for the reliablility. Never had one single issue and running for 3 years almost.
I haven't heard many people complaining about reliability with the N55 so thats a good thing

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Originally Posted by Andrewe92 View Post
since you got the numbers you were looking for i'll just add that I love my n55 and it's smooth power delivery, I'm sure you'll get the power you want from it
It'll be stock for a while so I'll have to get used to stock power

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Originally Posted by turo View Post
I hear ya, but there is a difference. Terry's 435 dynoed somewhere around 414 (link), while most e9X FBO's are around the 390 range it seems. There seems to be a ~20-25 hp difference at the wheels which has been chalked off to the larger 4" outlet on the F30's turbo, but someone correct me if I'm wrong.

I don't mean to get off topic though. OP, the N55 is definitely a great platform! Plenty of power, and hopefully there will be some more aftermarket turbo options soon for those of us hungry for more .
From what i've read it doesn't sound bad at all! As you said, aftermarket turbos are always a solution.

I haven't read up on the new F30s turbos but I just figured they could be tuned as the e9x series' turbos were
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      04-15-2014, 06:30 PM   #24
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The N55 is solid! 25k on the clock and zero issues.
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      04-15-2014, 06:59 PM   #25
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The N55 is solid! 25k on the clock and zero issues.
Good to hear. Now it's just a matter of finding the right e93!!
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      04-15-2014, 07:00 PM   #26
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FBO N55 here, zero issues aside from a broken cup holder
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      04-15-2014, 07:03 PM   #27
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Originally Posted by Dark_Knight_335
The N55 is solid! 25k on the clock and zero issues.
Good to hear. Now it's just a matter of finding the right e93!!
Buy mine next year
Someday I might sell it- we'll see
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      04-16-2014, 06:58 PM   #28
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FBO N55 here, zero issues aside from a broken cup holder
good to hear! I always thought the cup holders were pretty sturdy..

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Buy mine next year
Someday I might sell it- we'll see
haha I wanna join the e93 club before the summer! Don't sell it, you'll miss it too much
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      04-17-2014, 06:41 AM   #29
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You know what, you're right. Trouble is, that extra weight gets to you every now and again...everything is a trade off
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      04-19-2014, 01:25 PM   #30
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You know what, you're right. Trouble is, that extra weight gets to you every now and again...everything is a trade off
Thats true.. but a convertible in the summer is a very very good tradeoff!
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      04-19-2014, 01:42 PM   #31
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You know what, you're right. Trouble is, that extra weight gets to you every now and again...everything is a trade off
Thats true.. but a convertible in the summer is a very very good tradeoff!
Oh I know brother, it's just those other six months of the Jersey seasons that get to you I guess...

Loving it on a day like this though!
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      04-19-2014, 11:46 PM   #32
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Awesome thread, I am going through the same dilemma right now. I was really against the N55 at first but this thread really opened my eyes and now I'm really considering it if the right car comes by. You can't really go against liability.
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      04-21-2014, 01:04 PM   #33
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I had my Vanos crap out on me and had to replace a fuel pump as well (replaced under warranty). Otherwise it's been a great motor.
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      04-22-2014, 01:56 PM   #34
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My N55 is more reliable than my N52.
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