N51 E90 Engine 3stage intake manifold tune?

Bobby Pynes · 08-19-2011, 02:30 PM

Hi there guys, so ive been informed that the N51 motor has a 3stage intake manifold for the e90 328i, due to the fact that I live in California.

Seeing as the 330i has more horsepower with the same engine, and has the same intake manifold, is it possible to do a simple tune to get the 328i up to the 330i horsepower ratings?

I'm terribly sorry if this has already been addressed, i attempted searching before asking but was unable to find any conclusive answers, i appreciate any help you can offer!

t1mmy · 08-19-2011, 04:08 PM

think there was some discussion on it - reason theres no conclusive answers could be because its as of yet untested or thoroughly confirmed

Bobby Pynes · 08-19-2011, 09:08 PM

I would imagine that this would be a popular way to add 20 hp. If the engines are basically the same with a slightly different compression ratio, it should be relatively possible. It's sad that the 328 gets such flack and is ignored.

Johnny D · 08-19-2011, 10:50 PM

It is an easy way, but most people dont want to spend $500-1000 for parts and an ECU flash.

cisf0rcalvin · 08-19-2011, 11:26 PM

I think the compression ratios are different. 10:1 on the n51 vs 10:7:1 n52. The n51 has the 3 stage manifold to compensate for the lower compression ratio.

Bobby Pynes · 08-24-2011, 05:15 PM

So due to the compression ratio being different, its impossible to get the horsepower frmom an n51 most get when doing the manifold swap and a tune in the n52?

08-19-2011, 02:30 PM	#1
Bobby Pynes Second Lieutenant 34 Rep 287 Posts Drives: 2012 G37S Loaded Join Date: Jul 2011 Location: San Francisco iTrader: (0)	N51 E90 Engine 3stage intake manifold tune? Hi there guys, so ive been informed that the N51 motor has a 3stage intake manifold for the e90 328i, due to the fact that I live in California. Seeing as the 330i has more horsepower with the same engine, and has the same intake manifold, is it possible to do a simple tune to get the 328i up to the 330i horsepower ratings? I'm terribly sorry if this has already been addressed, i attempted searching before asking but was unable to find any conclusive answers, i appreciate any help you can offer!
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08-19-2011, 04:08 PM	#2
t1mmy Second Lieutenant 2 Rep 224 Posts Drives: BMW 328i 2008 Sport Join Date: Aug 2009 Location: Austin, TX iTrader: (0)	think there was some discussion on it - reason theres no conclusive answers could be because its as of yet untested or thoroughly confirmed __________________ BMW 328i 2008, 6MT, Perf Exh + Perf Int, Continental DWS and BMW Perf SSK
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08-19-2011, 09:08 PM	#3
Bobby Pynes Second Lieutenant 34 Rep 287 Posts Drives: 2012 G37S Loaded Join Date: Jul 2011 Location: San Francisco iTrader: (0)	Hmm I would imagine that this would be a popular way to add 20 hp. If the engines are basically the same with a slightly different compression ratio, it should be relatively possible. It's sad that the 328 gets such flack and is ignored. __________________ Bobby Pynes
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08-19-2011, 10:50 PM	#4
Johnny D Major 64 Rep 1,087 Posts Drives: 2006 BMW 325i Join Date: Apr 2011 Location: Hot Springs, AR iTrader: (4) Garage List 2006 BMW 325i [9.16]	It is an easy way, but most people dont want to spend $500-1000 for parts and an ECU flash.
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08-19-2011, 11:26 PM	#5
cisf0rcalvin First Lieutenant 33 Rep 322 Posts Drives: E90 LCI Join Date: Jan 2010 Location: Nevada iTrader: (2) Garage List 2010 BMW 328i [8.50]	I think the compression ratios are different. 10:1 on the n51 vs 10:7:1 n52. The n51 has the 3 stage manifold to compensate for the lower compression ratio. __________________ Add Ons: Charcoal Filter Delete, K&N Drop-in, Air Scoops, HID Angel Eyes, Splitters, M3 Lip Spoiler, Gloss Black Kidney Grills, Blackvue DR500-GW, M-Tech rear, BMW Performance Exhaust, M3 control arms, Bilstein HD
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08-24-2011, 05:15 PM	#6
Bobby Pynes Second Lieutenant 34 Rep 287 Posts Drives: 2012 G37S Loaded Join Date: Jul 2011 Location: San Francisco iTrader: (0)	So due to the compression ratio being different, its impossible to get the horsepower frmom an n51 most get when doing the manifold swap and a tune in the n52?
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