does the n51 have the 3 stage intake?

markus037 · 09-21-2014, 10:34 PM

was wondering if it did or not

Taskmaster · 09-21-2014, 10:48 PM

Yup.

1QuikWS6 · 09-22-2014, 03:35 AM

Yes sir

N51 has slightly lower compression than N52 - but gets the 3-stage to supposedly make up for that...

Tom Droze · 09-22-2014, 08:40 AM

Okay guys, I have a 2012 328i with the N51 engine and I'm fairly certain I don't have a three-stage intake manifold, is there anything visually I can look for to confirm if I have the three-stage manifold?

b-man · 09-22-2014, 09:17 AM

On the side of the manifold, you'll have a little square box. I think only 3 stages have that.

Delta0311 · 09-22-2014, 09:37 AM

Quote:

Originally Posted by Tom Droze

Okay guys, I have a 2012 328i with the N51 engine and I'm fairly certain I don't have a three-stage intake manifold, is there anything visually I can look for to confirm if I have the three-stage manifold?

If you don't have it then you're engine is a N52. ALL N51s come with a 3-stage.

Mike. · 09-22-2014, 10:02 AM

Quote:

Originally Posted by Tom Droze

Okay guys, I have a 2012 328i with the N51 engine and I'm fairly certain I don't have a three-stage intake manifold, is there anything visually I can look for to confirm if I have the three-stage manifold?

if under your hood it says SUVLEV you have the 3 stage. the n51 has the three stage

Tom Droze · 09-22-2014, 10:29 AM

Bingo, there it is! No need to order the three-stage manifold from Turner Motorsports now! I've known for a while that the primary difference between the N51 and the N52 is the compression,10.0:1 compared to 10.7:1. So now it's my understanding the three-stage manifold was added to the N51 to offset the difference in compression. While the N51 and the N52 have the same horsepower rating, I'm wondering if the N51, with the three-stage manifold, might put out a few more horsepower?

LaCross · 09-22-2014, 11:27 AM

Generally an N52 + 3stage manifold puts out more power than an N51 + tune

b-man · 09-22-2014, 11:42 AM

If you were to do the same mods to both engines (tune, exhaust, headers etc), n52 should end up with more power. Around 15-20

Tom Droze · 09-22-2014, 11:46 AM

Obviously the N52 with more compression has more upside potential, I was asking the question in a stock configuration.

b-man · 09-22-2014, 11:51 AM

Do you mean a stock 328 n51 vs 328 n52(no 3 stage)? It's the same.

Tom Droze · 09-22-2014, 12:22 PM

Yes, I know they are rated the same horsepower wise but do they actually have the same horsepower in reality. It's just a curiosity thought.

Delta0311 · 09-22-2014, 12:29 PM

Quote:

Originally Posted by Tom Droze

Yes, I know they are rated the same horsepower wise but do they actually have the same horsepower in reality. It's just a curiosity thought.

Yes they do. BMW does not overrate their engines. Can't tell people a motor produces 230hp (crank) and have it only output 210hp or so, do that and expect to get sued.

Tom Droze · 09-22-2014, 12:35 PM

Quote:

Originally Posted by Delta0311

Yes they do. BMW does not overrate their engines. Can't tell people a motor produces 230hp (crank) and have it only output 210hp or so, do that and expect to get sued.

But they can under rate the horsepower without legal recourse.

Tim603 · 09-22-2014, 01:27 PM

...............................You have got to be kidding me

I have an N51 SMH, all this time I have had a 3IM

Taskmaster · 09-22-2014, 01:40 PM

Quote:

Originally Posted by b-man

If you were to do the same mods to both engines (tune, exhaust, headers etc), n52 should end up with more power. Around 15-20

Uhhhh...

hassmaschine · 09-22-2014, 01:41 PM

Quote:

Originally Posted by Delta0311

Yes they do. BMW does not overrate their engines. Can't tell people a motor produces 230hp (crank) and have it only output 210hp or so, do that and expect to get sued.

every car BMW produces gets put on a dyno before it leaves manufacturing. There might be some that make more, but ones that make less get sent back. they don't guess and they aren't going to leave that much margin on the table. you don't really think there's enough manufacturing variability for a +20hp margin on a motor BMW makes millions of? I'd be surprised if it were +5hp.

the real variability here is in chassis dynos. you can't take the number off some random dyno as the word of god, especially when lots of places attempt to guess at drivetrain losses and correct (guess) for BHP. if all you want is a number on a dyno plot you can pretty much make that happen..

b-man · 09-22-2014, 01:41 PM

Quote:

Originally Posted by TheAxiom

Uhhhh...

Go on

Tim603 · 09-22-2014, 01:50 PM

Quote:

Originally Posted by TheAxiom

Uhhhh...

Dude im having trouble taking this in.....So what your telling me is my car isn't going to get any faster?? lol

b-man · 09-22-2014, 01:51 PM

Quote:

Originally Posted by Tim603

Dude im having trouble taking this in.....So what your telling me is my car isn't going to get any faster?? lol

haha. Just wait for the sc

Tim603 · 09-22-2014, 01:55 PM

Quote:

Originally Posted by b-man

haha. Just wait for the sc

lol right, I think I may have a 335i by then...

Im wondering if my AA tune affected the 3IM in any way, hopefully it didn't deactivate the Disa valves or something.

09-21-2014, 10:34 PM	#1
markus037 Lieutenant 75 Rep 417 Posts Drives: Alpine White 2010 328Xi Join Date: Jan 2014 Location: Pottstown, PA iTrader: (0)	does the n51 have the 3 stage intake? was wondering if it did or not __________________ ASE Master Certified PA Safety and Emissions inspector
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09-21-2014, 10:48 PM	#2
Taskmaster Banned 2494 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Yup.
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09-22-2014, 03:35 AM	#3
1QuikWS6 No 55mph 1644 Rep 8,496 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	Yes sir N51 has slightly lower compression than N52 - but gets the 3-stage to supposedly make up for that... __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit
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09-22-2014, 08:40 AM	#4
Tom Droze Major 417 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	Okay guys, I have a 2012 328i with the N51 engine and I'm fairly certain I don't have a three-stage intake manifold, is there anything visually I can look for to confirm if I have the three-stage manifold?
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09-22-2014, 09:17 AM	#5
b-man Major 608 Rep 1,090 Posts Drives: 328xi Join Date: Jan 2013 Location: maine iTrader: (2)	On the side of the manifold, you'll have a little square box. I think only 3 stages have that.
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09-22-2014, 10:29 AM	#8
Tom Droze Major 417 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	Bingo, there it is! No need to order the three-stage manifold from Turner Motorsports now! I've known for a while that the primary difference between the N51 and the N52 is the compression,10.0:1 compared to 10.7:1. So now it's my understanding the three-stage manifold was added to the N51 to offset the difference in compression. While the N51 and the N52 have the same horsepower rating, I'm wondering if the N51, with the three-stage manifold, might put out a few more horsepower?
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09-22-2014, 11:27 AM	#9
LaCross Second Lieutenant 70 Rep 243 Posts Drives: e90 335xi Join Date: Aug 2014 Location: United States iTrader: (0)	Generally an N52 + 3stage manifold puts out more power than an N51 + tune
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09-22-2014, 11:42 AM	#10
b-man Major 608 Rep 1,090 Posts Drives: 328xi Join Date: Jan 2013 Location: maine iTrader: (2)	If you were to do the same mods to both engines (tune, exhaust, headers etc), n52 should end up with more power. Around 15-20
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09-22-2014, 11:46 AM	#11
Tom Droze Major 417 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	Obviously the N52 with more compression has more upside potential, I was asking the question in a stock configuration.
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09-22-2014, 11:51 AM	#12
b-man Major 608 Rep 1,090 Posts Drives: 328xi Join Date: Jan 2013 Location: maine iTrader: (2)	Do you mean a stock 328 n51 vs 328 n52(no 3 stage)? It's the same.
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09-22-2014, 12:22 PM	#13
Tom Droze Major 417 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	Yes, I know they are rated the same horsepower wise but do they actually have the same horsepower in reality. It's just a curiosity thought.
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09-22-2014, 01:27 PM	#16
Tim603 Colonel 494 Rep 2,283 Posts Drives: 2007 335i E90 Join Date: Feb 2012 Location: North Canton, OH iTrader: (8) Garage List 2007 335i [0.00]	...............................You have got to be kidding me I have an N51 SMH, all this time I have had a 3IM __________________ Build Thread
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