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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 > Running 3 Stage as Single Stage



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      06-16-2014, 05:28 PM   #1
jc5988
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Running 3 Stage as Single Stage

Any one thinking of running 3 Stage as Single Stage and take out those disa actuator? should make it much more smoother... I dont really need low end power much since im driving manual.

any one has a broken set to try experiment this? taking off the flap and reinstall it back and see if it works....
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      06-16-2014, 05:31 PM   #2
SDemetris
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I suppose you could use some glue and unplug one of the flaps.. not a bad idea actually.
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      06-16-2014, 07:06 PM   #3
TheAxiom
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Don't do it, You'll lose power. By unplugging the flaps, you're leaving them closed, your car would nose dive in power past 3500RPM. Even if you left one open, you'd still lose power. The reason is the runners are optimized for a specific RPM range with the DISAs are opened/closed.

If you want, you can buy a single stage manifold and swap it on, it will absolutely work better than what your planning.


For the record, 10whp up to would still make you slower than having 20whp in mid range - average horsepower is more important than peak.
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      06-16-2014, 09:23 PM   #4
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Edit, I read that wrong - You said take out the flaps completely and sealing the hole? Yeah, don't bother.
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      06-17-2014, 08:44 AM   #5
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Buy my single stage for dirt
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      06-17-2014, 11:13 AM   #6
jc5988
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Quote:
Originally Posted by TheAxiom View Post
Don't do it, You'll lose power. By unplugging the flaps, you're leaving them closed, your car would nose dive in power past 3500RPM. Even if you left one open, you'd still lose power. The reason is the runners are optimized for a specific RPM range with the DISAs are opened/closed.

If you want, you can buy a single stage manifold and swap it on, it will absolutely work better than what your planning.


For the record, 10whp up to would still make you slower than having 20whp in mid range - average horsepower is more important than peak.
my idea is even at open position the flap will still create some restriction inside the 3 stage, taking them out should give a little extra flow from mid to top end.

lots of e36 m3 went for bigger intake manifold for top end power, i just thought it will be interesting to see if anyone done this before.


here is m50 vs 52 manifold.
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