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      02-22-2011, 08:54 AM   #89
andymunoz
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I think the N55 is a downgraded engine harder to tuned and that way BMW don't suffer from warranty issues cause by mods.
If the N55 is so great why is not been used in the new 1 M Coupe.
BMW knows the potential of the N54 and that's why they are leaving N54 as the higher power option for the best in their class (335is and 1M).

Thats just my opinion
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      02-22-2011, 09:15 AM   #90
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Quote:
Originally Posted by andymunoz View Post
I think the N55 is a downgraded engine harder to tuned and that way BMW don't suffer from warranty issues cause by mods.
If the N55 is so great why is not been used in the new 1 M Coupe.
BMW knows the potential of the N54 and that's why they are leaving N54 as the higher power option for the best in their class (335is and 1M).

Thats just my opinion
Lol you answered your own question, bmw knows the potential of the n54 hence why they went with it. The n55 has only been around a year and with the time frame of the 1m it didn't leave a big enough window to get it done.

The n55 is already nearing 400hp with 14lbs of boost and pump gas. Only time will tell its full potential.
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      03-31-2011, 09:36 AM   #91
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^I agree with the last part. At the least a bigger twin scroll will do wonders. Wasn't HPF thinking about doing a turbo upgrade on the N54???... They were going to switch the twins to 1 big single turbo... If that's the case I would assume the N55 is already a step ahead of the game.
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      03-31-2011, 09:44 AM   #92
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Quote:
Originally Posted by APupNamedSmokey View Post
^I agree with the last part. At the least a bigger twin scroll will do wonders. Wasn't HPF thinking about doing a turbo upgrade on the N54???... They were going to switch the twins to 1 big single turbo... If that's the case I would assume the N55 is already a step ahead of the game.
I do not really think this will be possible without upgrading some internals...Most non forged crankshafts will only hold up to around 400-450whp applications.
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      03-31-2011, 12:56 PM   #93
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^Forgot about that... I think 400-450 is enough to satisfy alot of people though.
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      03-31-2011, 02:55 PM   #94
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N55 = no forged crankshaft. Surprisingly, the forged shaft on the N54 is heavier than the non-forged one on the N55.

I think the N55 properly tuned and with proper upgrades will be capable of 500hp without issues with internal components. Problems start when people get desperate for more power at any cost, run extremely lean tunes leading to detonation under high temperatures, and there goes the engine. As someone else mentioned, only time will tell.

Quote:
Originally Posted by maxnix View Post
But some guys are running N54 in excess of 500 hp at the rollers. Is the N55 crank not forged?
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      03-31-2011, 03:03 PM   #95
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Kicking it at cobb with rob. Hopefully they'll be able to get things running.
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      04-03-2011, 04:17 PM   #96
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Just because it's not forged doesn't mean it won't hold some power. The stock crankshaft in the GM LS2 can easily hold 800whp all day and it isn't forged. I'm sure BMW wouldn't replace it if it wasn't more than adequate still.

I'm really interested to see what the N55 will put down once it has some more R&D done on it.
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      04-03-2011, 05:49 PM   #97
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http://www.bimmerfile.com/2011/02/23...n55-power-kit/

Old news? Just another 20 hp and probably expensive due to the cooling enhancements.
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      04-07-2011, 02:37 AM   #98
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Alright guys, I'm going to need some help putting together a decent exhaust system.

I've got the AR Design downpipe but I need to pair it with a catback exhaust but I'm not sure which one to go with. I don't want to go with Berk for some reason and all the brands that I like: Active Autowerke, Dinan, and UUC only make axle back.

Should I just go with one of the axleback and buy a custom midpipe?

Opinions are much appreciated!
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      04-07-2011, 11:37 AM   #99
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Quote:
Originally Posted by goeslikeschnell View Post
Alright guys, I'm going to need some help putting together a decent exhaust system.

I've got the AR Design downpipe but I need to pair it with a catback exhaust but I'm not sure which one to go with. I don't want to go with Berk for some reason and all the brands that I like: Active Autowerke, Dinan, and UUC only make axle back.

Should I just go with one of the axleback and buy a custom midpipe?

Opinions are much appreciated!
Or you could go axle back with one of those companies and just get berk midpipes. Personally I think I am going to go with the full street berk exhaust set up...I thought the midpipes would do it for me, but they don't.
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      04-08-2011, 12:23 AM   #100
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Quote:
Originally Posted by goeslikeschnell View Post
Alright guys, I'm going to need some help putting together a decent exhaust system.

I've got the AR Design downpipe but I need to pair it with a catback exhaust but I'm not sure which one to go with. I don't want to go with Berk for some reason and all the brands that I like: Active Autowerke, Dinan, and UUC only make axle back.

Should I just go with one of the axleback and buy a custom midpipe?

Opinions are much appreciated!
Bro, get a custom midpipe like mine to go with that downpipe. You wont be dissapointed. GUARANTEED
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      04-09-2011, 04:24 PM   #101
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I think there will be no difference if u change the n55 midpipe because the stock 1 has no cats !
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      04-09-2011, 06:17 PM   #102
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So... I just got back from Bavarian Exclusive's Dollar for Power Dyno Challenge and there was 1 N55 amongst the competitors:
N55 335i 6MT
AR Design DP
Remus Race Catback
Proceed

Dynojet read out:
360whp
423wtq!!!!!!!!!!!

He didn't win but he impressed everyone with the amount of torque!
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      04-10-2011, 11:21 AM   #103
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gus why does the dct changes the gear even in Manual mode ? whats the use if it changes the gears automatically it suppose to be full manual ? for example when am in full manual mode first gear it automatically chnges to 2nd near the redline
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      04-10-2011, 04:12 PM   #104
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The same goes for the m3 dct and m5 smg

Quote:
Originally Posted by oman135 View Post
gus why does the dct changes the gear even in Manual mode ? whats the use if it changes the gears automatically it suppose to be full manual ? for example when am in full manual mode first gear it automatically chnges to 2nd near the redline
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      04-11-2011, 03:14 PM   #105
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http://www.e90post.com/forums/showthread.php?t=514848

RSD charge pipe prototype!
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      04-11-2011, 05:10 PM   #106
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http://www.e90post.com/forums/showthread.php?t=514145

N55 Dyno video.

I stand corrected. 352whp, 423wtq
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      04-13-2011, 05:28 PM   #107
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One quick update...HPF just said they are done with their exhaust...they are just doing the finishing touches...so sometime in the next couple weeks I imagine it should be done.

Also with regards to the midpipes it just gives you a little bit louder, and little bit deeper exhaust note. I installed the berk midpipes thinking it would make a huge difference. If any of you are in my area, and would like to see the difference feel free to let me know.

I will probably be going with HPF exhaust next month when it is out.
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      04-18-2011, 09:13 PM   #108
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Quote:
Originally Posted by Aries932 View Post
One quick update...HPF just said they are done with their exhaust...they are just doing the finishing touches...so sometime in the next couple weeks I imagine it should be done.

Also with regards to the midpipes it just gives you a little bit louder, and little bit deeper exhaust note. I installed the berk midpipes thinking it would make a huge difference. If any of you are in my area, and would like to see the difference feel free to let me know.

I will probably be going with HPF exhaust next month when it is out.
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      04-18-2011, 10:02 PM   #109
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Quote:
Originally Posted by andymunoz View Post
I think the N55 is a downgraded engine harder to tuned and that way BMW don't suffer from warranty issues cause by mods.
If the N55 is so great why is not been used in the new 1 M Coupe.
BMW knows the potential of the N54 and that's why they are leaving N54 as the higher power option for the best in their class (335is and 1M).

Thats just my opinion
Gotta love when people speak so soon...Here is a quote from shiv.

"Below is a video of a 15psi run. You can watch the boost gauge on the dash (fuel gauge) during the run. It peaks just shy of 15psi in the midrange and falls to 10-11psi up top. Pretty low boost for 360+whp. The n55 is an excellent engine. Better than the n54 in many respects i'd say. And a properly matched FMIC upgrade was worth 20-30whp gains from 4200 to 6500rpm!"
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      04-19-2011, 02:56 AM   #110
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I just can't find the reason for N54/N55 neverending story. Again and again and again and... Why?
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