N51 vs n52 with AA tune

joots · 04-25-2011, 12:24 PM

Is there any difference between n51 and n52 when tuned with AA? HP and torque gains? Butt o meter gains? Trottle sensitivity?

Wlew · 04-25-2011, 01:44 PM

should be the exact same.

berserkerx · 04-25-2011, 02:04 PM

The N52 will have a higher compression still. N52 has a 10.7 while the N51 has a 10. But there was a difference in the head on the N51 like a different combustion chamber shape or something like different sized valves.

If I remember correctly I believe you need to add the 3 stage intake manifold on the N51 where the 330i N52 came with it.

joots · 04-25-2011, 04:47 PM

Quote:

Originally Posted by berserkerx

The N52 will have a higher compression still. N52 has a 10.7 while the N51 has a 10. But there was a difference in the head on the N51 like a different combustion chamber shape or something like different sized valves.

If I remember correctly I believe you need to add the 3 stage intake manifold on the N51 where the 330i N52 came with it.

Does the 328 n52 have the 3 stage intake manifold?

guerilla twang · 04-25-2011, 05:00 PM

Quote:

Originally Posted by joots

Does the 328 n52 have the 3 stage intake manifold?

Nope

PhillyNate · 04-25-2011, 05:04 PM

The N51 has the 3 stage intake though.

tamster00 · 04-25-2011, 08:17 PM

Quote:

Originally Posted by PhillyNate

The N51 has the 3 stage intake though.

Is the 2008 328i a n52 or n51? And would that have the 3stage intake? I was reading somewhere that my car is a SULEV and it may have it..

Juan.sidarta · 04-25-2011, 08:51 PM

Quote:

Originally Posted by tamster00

Is the 2008 328i a n52 or n51? And would that have the 3stage intake? I was reading somewhere that my car is a SULEV and it may have it..

Mine is SULEV too, 2007. I think that it is N51, and therefore it should have it. If we do add a stage 3 intake manifold, does it make it much faster than the N52's?

PhillyNate · 04-25-2011, 09:02 PM

Quote:

Originally Posted by Juan.sidarta

Mine is SULEV too, 2007. I think that it is N51, and therefore it should have it. If we do add a stage 3 intake manifold, does it make it much faster than the N52's?

First off guys, if you have a SULEV 328i you have the N51. The N52 is ULEV. Secondly it's my understanding that EVERY N51 sold in America has the 3 stage intake manifold. My car certainly has it.

tamster00 · 04-25-2011, 09:28 PM

Quote:

Originally Posted by PhillyNate

First off guys, if you have a SULEV 328i you have the N51. The N52 is ULEV. Secondly it's my understanding that EVERY N51 sold in America has the 3 stage intake manifold. My car certainly has it.

So we wouldn't have to buy a 3stage intake manifold, and the only diff is compression, compared to the 330i, am I right?

PhillyNate · 04-26-2011, 06:54 AM

Quote:

Originally Posted by tamster00

So we wouldn't have to buy a 3stage intake manifold, and the only diff is compression, compared to the 330i, am I right?

Right. Slightly lower compression to accommodate a different piston crown design. Someone on this board stated that you can get 270hp out of this engine with the right tune and that it's been done. That may be optimistic but I do believe the HP and torque numbers from the N52 high output can be achieved. 255 and 220 respectively.

04-25-2011, 12:24 PM	#1
joots Private 6 Rep 62 Posts Drives: e90 328xi Join Date: Nov 2010 Location: ks iTrader: (0)	N51 vs n52 with AA tune Is there any difference between n51 and n52 when tuned with AA? HP and torque gains? Butt o meter gains? Trottle sensitivity?
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04-25-2011, 01:44 PM	#2
Wlew Major 77 Rep 1,116 Posts Drives: 2011 E90 335i Join Date: Sep 2009 Location: Washington, DC iTrader: (12)	should be the exact same. __________________ 2011 335i Sports Package \| VRSF FMIC \| Cobb AP3 \| Dinan Exhaust \| BMS Intake \| VRSF CP \| Lux H8 Angel Eyes \| Mtec LED Fogs \|
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04-25-2011, 02:04 PM	#3
berserkerx Private First Class 8 Rep 164 Posts Drives: 2006 330i Join Date: Jan 2011 Location: Utah iTrader: (0)	The N52 will have a higher compression still. N52 has a 10.7 while the N51 has a 10. But there was a difference in the head on the N51 like a different combustion chamber shape or something like different sized valves. If I remember correctly I believe you need to add the 3 stage intake manifold on the N51 where the 330i N52 came with it.
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04-25-2011, 05:04 PM	#6
PhillyNate ENTHUSIAST 135 Rep 2,097 Posts Drives: 2010 Porsche Cayman Join Date: Apr 2011 Location: Philadelphia iTrader: (0) Garage List 2010 Porsche Cayman [0.00]	The N51 has the 3 stage intake though. __________________ "what I'm driving here...is an ending." Jeremy Clarkson 2010 Carrara White Porsche Cayman 6mt 2014 Whiteout Toyota GT-86 6mt(Sold 05/23/15) 2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14) 2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11)
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