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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 > Single/Triple Stage Induction



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      12-09-2005, 01:44 AM   #1
SLOOPjohnB
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Question Single/Triple Stage Induction

Can some one explain or direct me to a place that can explain the difference between the single and triple stage induction? Please don't spare the details.
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      12-13-2005, 03:21 PM   #2
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http://auto.howstuffworks.com/question517.htm

This is best I can do on short notice. In a most basic sense the 3 stage system varies the length of the runners.
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      12-18-2005, 12:45 AM   #3
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Socom-You wouldn't happen to know how they change the legnth of the runners do you? The only 2 things I can think of are:

1) Using a sleeve system which may entail altering the position of the intake maifold either in part or the whole.

2) Using multiple hard pipes that are controled my a series of valves.

Either of these methods would case major design challenges.
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      12-21-2005, 11:38 AM   #4
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Search BMW Technology (I haven't). If I remembe correctly from their literature, they use what I could describe as a sleeve system. Apparently the 3-stage system is infintely variable and has been used in other BMW engines for some time. The I6 in my car (e46zhp) has a 2 stage "static" system (I believe).
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      12-21-2005, 12:33 PM   #5
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From BMW tech website:

Fully-variable intake system (DIVA).
Alongside the valve train system Valvetronic, BMW's eight-cylinder engines possess another innovation that ensures they can adjust perfectly to the driver's power requirements: the fully-variable intake system, DIVA.
It adapts the length of the intake manifold using a coiled regulation mechanism. Long intake travel provides high torque at low engine speeds, short intake travel helps to develop high power at high speeds.







I think this is for an earlier variable intake (like the one on the 7-series) but the concept is the same.
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      12-21-2005, 03:35 PM   #6
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Good man for finding the answer.!!!
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