N55: turbos, crankshaft

Dubso · 07-29-2011, 05:29 AM

So after the N55 vs N54 thread coming to an end, the main things I have learned is that n55 twinscroll turbos not providing as much power with tunes, and tuners dreading the crankshaft due to it being cast rather than forged, or the other way around (whatever). Has anyone swapped tubos or and crank fom n54 to n55? Has anyone put a aftermarket turbo on either engine? Hks, Garret?

shockin330i · 07-29-2011, 04:36 PM

I doubt we will ever make enough power to harm a crankshaft...

van11135 · 07-29-2011, 09:25 PM

How about DCT cranks/clutch(es), are they weaker or stronger than manual ones?

I noticed on the new BMW Performance package that torque is +30ft for the DCT yet only +17 for manual...?

Cheers!

Vlaze · 07-30-2011, 06:23 AM

The manual is a getrag transmission. It's a beast. Not very familiar with the DCT.

I've read on here that it (DCT) can start to slip with some higher power levels. Can't confirm that though.

tracer bullet · 07-30-2011, 10:30 PM

Quote:

Originally Posted by shockin330i

I doubt we will ever make enough power to harm a crankshaft...

Agreed. Keep the oil flowing, the cast crank will be just fine. You'll melt piston tops if you aren't tuned correctly long before you'll damage a crank.

No offense but I'm reading "I heard the N55 is worse because of something someone said about the crank, and I don't really know what they are talking about, but my engine must suck, what can I do?????". Are you pumping out enough power that you have cause for concern?

Dubso · 07-31-2011, 04:02 AM

No offense but I'm reading "I heard the N55 is worse because of something someone said about the crank, and I don't really know what they are talking about, but my engine must suck, what can I do?????". Are you pumping out enough power that you have cause for concern?[/QUOTE]

I guess i should have worded it better. I dont think it is worse,both engines are in my opinion a masterpiece otherwise I wouldnt drive a bmw. its just the same thing I keep coming back to: crankshaft. I do agree that pistons will melt long before crank will be harmed, but tuners number 1 thing to say is: nah n55 crank aint good, cant tune it as far as n54. I think it has more to do with bmw not wanting the engines tuned.

07-29-2011, 05:29 AM	#1
Dubso Private 22 Rep 90 Posts Drives: 11' 135i, 04' S60R, 03 MR-2 S Join Date: Jun 2010 Location: Stuttgart, Germany iTrader: (0)	N55: turbos, crankshaft So after the N55 vs N54 thread coming to an end, the main things I have learned is that n55 twinscroll turbos not providing as much power with tunes, and tuners dreading the crankshaft due to it being cast rather than forged, or the other way around (whatever). Has anyone swapped tubos or and crank fom n54 to n55? Has anyone put a aftermarket turbo on either engine? Hks, Garret?
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07-29-2011, 04:36 PM	#2
shockin330i Brigadier General 798 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	I doubt we will ever make enough power to harm a crankshaft... __________________ ERnie 2016 BSM/f80/ZCP
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07-29-2011, 09:25 PM	#3
van11135 New Member 0 Rep 9 Posts Drives: 2011 135i DCT with M package Join Date: Jun 2011 Location: Vancouver iTrader: (0)	How about DCT cranks/clutch(es), are they weaker or stronger than manual ones? I noticed on the new BMW Performance package that torque is +30ft for the DCT yet only +17 for manual...? Cheers!
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07-30-2011, 06:23 AM	#4
Vlaze Private 4 Rep 50 Posts Drives: 2011 135i MT Join Date: Apr 2011 Location: St. Louis iTrader: (1)	The manual is a getrag transmission. It's a beast. Not very familiar with the DCT. I've read on here that it (DCT) can start to slip with some higher power levels. Can't confirm that though.
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07-31-2011, 04:02 AM	#6
Dubso Private 22 Rep 90 Posts Drives: 11' 135i, 04' S60R, 03 MR-2 S Join Date: Jun 2010 Location: Stuttgart, Germany iTrader: (0)	No offense but I'm reading "I heard the N55 is worse because of something someone said about the crank, and I don't really know what they are talking about, but my engine must suck, what can I do?????". Are you pumping out enough power that you have cause for concern?[/QUOTE] I guess i should have worded it better. I dont think it is worse,both engines are in my opinion a masterpiece otherwise I wouldnt drive a bmw. its just the same thing I keep coming back to: crankshaft. I do agree that pistons will melt long before crank will be harmed, but tuners number 1 thing to say is: nah n55 crank aint good, cant tune it as far as n54. I think it has more to do with bmw not wanting the engines tuned.
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