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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N51 E90 Engine 3stage intake manifold tune?



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      08-19-2011, 01:30 PM   #1
Bobby Pynes
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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, 03:08 PM   #2
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think there was some discussion on it - reason theres no conclusive answers could be because its as of yet untested or thoroughly confirmed
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      08-19-2011, 08:08 PM   #3
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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.
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      08-19-2011, 09:50 PM   #4
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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, 10:26 PM   #5
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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.
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      08-24-2011, 04:15 PM   #6
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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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