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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 > 3 Stage Intake Onwer: Throttle Response



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      12-22-2012, 08:46 PM   #1
jc5988
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3 Stage Intake Onwer: Throttle Response

need some feedback from 3stage intake owner.

for some reason at WOT i cant really feel each stage been kick on.

at 40-60 percent throttle in i can feel each stage been kicks on very well, but just not at WOT.


how does your 3 stage feel? can you feel each stage kicks on very sharply at WOT?
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      12-23-2012, 12:13 AM   #2
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Mine has adapted and is smooth no matter what throttle amount. Just a constant pull to redline.
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      12-23-2012, 09:03 PM   #3
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My experience is similar to yours - I only feel the flaps activating under part throttle. However I haven't even got through a full tank of gas since installing the manifold and have no tune yet.
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      12-23-2012, 10:50 PM   #4
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I reset the adaptaions for the engine and transmission after I installed the manifold and ran the tune. You will need a bav tool to do that though.
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      12-23-2012, 11:01 PM   #5
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My guess would be that at full throttle, the flaps go to full power setting. Under less throttle position, it switches stages as you are asking more of the engine.
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      12-24-2012, 10:02 PM   #6
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I can't feel any specific stage... it feels very linear to me.
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      12-24-2012, 11:00 PM   #7
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Quote:
Originally Posted by Ricke90 View Post
My guess would be that at full throttle, the flaps go to full power setting. Under less throttle position, it switches stages as you are asking more of the engine.
the flaps are operated at rpm trigger points. The lower flap opens around 3000rpm, and the upper flap is around 4100 rpm or so, where both stay open to redline. They are both closed under 3000rpm. The flaps are either 100% open or 100% closed, there is no in-between setting. I think the difference people are feeling at part throttle is that the volume of air in the manifold is different, which has an effect on the resonance properties of the flaps opening and closing.
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      12-25-2012, 03:06 AM   #8
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On WOT, I can only feel it at certain times. Mainly when I hear the "supercharger" sound at 5k to redline and you can feel it kick in at WOT if you're in an incorrect gear (i.e. if I was in 3rd gear going 20 and I do a full throttle pull, you feel the torque build up at 3k to 5k and from 5k its a smooth pull to redline)
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      12-25-2012, 08:20 PM   #9
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thanks for all the feedback, I kinda poke around the german 130i forum and folks there have the same concern, so i guess its normal for 3 stage to react this way.


Quote:
"Extra"-Schub exceeding 3,000 rpm?
SERVUS municipality.

After I rummaged around a little while, but found nothing have, I am compelled to bother you with this question:

In the partial load range, so at ~ 30-50% druchgedrücktem Accelerator I feel just above 3,000 rpm a small but significant change: the motor attracts more and revs up faster/free therefore also something that without that I change the position of the pedal. Happens always at the same speed, so this is reproducible. In the full-load range does not occur - felt. The whole thing is definitely no imagination So, let me die not stupid and tells me!


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