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BMW 3-Series (E90 E92) Forum
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N51
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04-10-2011, 06:33 PM | #23 | |
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04-10-2011, 06:58 PM | #24 | |
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Leads me to this question. Anyone know of an available tune out there to maximize the potential of our N51? |
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04-10-2011, 07:15 PM | #25 | |
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By the way, your car looks great. I like all the upgrades. Mine looks similiar in Alpine White as well. Last edited by PhillyNate; 04-10-2011 at 08:10 PM.. |
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04-10-2011, 08:56 PM | #26 | |
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However, as far as finding the tune for the n51 goes, many owners 328i/128i out here in California will be grateful for the recommendations of an available tune to maximize the potential the stated three stage manifold |
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04-11-2011, 01:14 PM | #27 |
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California emmisions are required in Rhode Island, so the N51 was the only choice. It makes the same HP as the N52 so I didn't question it.
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04-11-2011, 02:00 PM | #28 |
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Before you guys get excited, please look at this post and Identify your valves on your engines.
http://www.e90post.com/forums/showpo...40&postcount=5 I am not saying you all do not have them, but there are multiple versions (revisions) of the motor. |
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04-11-2011, 02:34 PM | #29 |
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Mass has California Emissions and I have an N52, I am sure many others do in this state as well as those in California..
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04-11-2011, 03:19 PM | #30 |
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no need to argue guys. The 1-series comes with it, as does the E90, 91, and 93. I have no idea how they choose who was getting what.
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04-11-2011, 04:05 PM | #31 |
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I find all of this so very confusing..as;dflkjagha;slkfja
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04-11-2011, 05:36 PM | #32 | |
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04-14-2011, 05:56 PM | #34 |
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N51 vs. N52
I found this on Edmonds.com
The 328i SULEV uses the N51 versus the N52 engine. In order to comply with SULEV requirements, the N51 is a variant of the N52 engine. Some of the SULEV measures for the N51 include: • Near engine catalyst with additional underbody catalyst • Secondary air system • Optimized combustion chamber geometry in cylinder head • Modified piston crown for lower compression • Plastic valve cover with integrated crankcase vent valve and separator (from N52KP) • Stainless steel fuel lines with threaded connections • Radiator with “Prem-air” coating • Throttle system - EGAS08 carried over from N52KP • Airbox with Activated carbon filter for EVAP control • Purge system pipes are made from “optimized” plastic BMW claims there is no performance difference other than the increase in weight which adds about 30 lbs. |
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04-14-2011, 06:22 PM | #35 | |
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04-24-2011, 11:38 AM | #36 |
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My dad's car is parked next to mine right now. I took a look and his N51 indeed has a 3stage manifold and my N52 has a 1 stage. Much easier to see the difference between the 2 manifolds when they are side by side.
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04-25-2011, 11:03 AM | #37 |
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04-25-2011, 12:32 PM | #38 |
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My wife's '08 328xi has an N52. My '09 128i has an N51. Maybe the law went into effect in '09. That would explain why your '07 328xi has the N52.
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04-25-2011, 01:24 PM | #39 | |
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Sorry about not getting pics, I only had my phone on me and the pictures would not have been very clear. Next time I am at the parents, I will be sure to find the good camera and take some shots. To be honest though, the engine bays looked entirely identical except for the DISA motors on his intake mani. If you weren't looking for it, you wouldnt notice the difference between the 2 engines. I think it is a safe bet to say that many more people have the N51 without knowing. |
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04-26-2011, 03:45 PM | #40 |
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Took a quick look on realoem.com and it appears that the intake manifold for the n51 is identical to that of the n52 high output (minus part 14? power distribution box $8.20)...
n51: http://realoem.com/bmw/showparts.do?...56&hg=11&fg=40 n52: http://realoem.com/bmw/showparts.do?...56&hg=11&fg=40 n52 (high output): http://realoem.com/bmw/showparts.do?...56&hg=11&fg=40
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04-26-2011, 04:12 PM | #41 | |
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Last edited by PhillyNate; 04-26-2011 at 08:32 PM.. |
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04-26-2011, 09:57 PM | #42 |
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My 2008 328i has the N51 w/ three stage manifold. I wonder how we can up the compression :P
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04-27-2011, 03:31 AM | #43 |
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Many posts in this thread assume that the only hardware difference between the high output N52 and the low output N52 is the 3-stage intake manifold, which I don't think is a foregone conclusion.
In other words, just because the N51 has the 3-stage intake manifold, doesn't necessarily mean that it's just a (very elusive, btw) tune away from being a high output N52. I've heard some talk that injectors may be different, as well as the exhaust manifold. Not trying to rain on anyone's parade, just saying that there could (and likely is, IMO) more going on here, hardware wise, than simply the addition or deletion of an intake manifold. I would love to be wrong on this, because if it's that easy I would be all about it. Of course, the tricky part is the tune. For some reason no one (in the US, at least) can seem to really crack this thing.
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04-28-2011, 03:58 AM | #44 | |
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