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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 > Questions re multi-stage air intake geometry?



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      07-29-2006, 08:08 AM   #1
shoread
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Drives: E90 325i SE Saloon
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Questions re multi-stage air intake geometry?

I understand the 330i E90 (both US & European spec) has a variable, multi-stage air intake manifold (designed to give an improved, more even torque throughout range of engine speeds).

Likewise the 325i (but only in Europe, not the US 325i).

I believe there are a few different channels/paths for the air to flow through, and some actuators open/close the channels accoridng to engine rpm.

Think the old E46 had a two-stage intake, but believe the E90 has a three or four stage intake.

Can anybody shed any further light on how this all works?

And does anybody know at what enginre rpms's the multi-stage intake changes the air path on the 6-cylinder E90's?
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