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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Power Lag during fast 6MT shifting- the 411



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      09-03-2009, 04:48 PM   #23
jpsimon
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ugh, do a search. That spike you see on every datalog isn't seen by the engine, it's been talked about countless times it should be a sticky. He's talking about the higher boost any tuned car sees, 14-16psi vs. stock boost of 7-8psi. Essentially double what the original system was designed around.
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      09-03-2009, 05:08 PM   #24
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this is awesome, so many firmware updates. im really impressed and cannot wait for public release. 6MT for life!
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      09-03-2009, 05:26 PM   #25
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Quote:
Originally Posted by jpsimon View Post
ugh, do a search. That spike you see on every datalog isn't seen by the engine, it's been talked about countless times it should be a sticky. He's talking about the higher boost any tuned car sees, 14-16psi vs. stock boost of 7-8psi. Essentially double what the original system was designed around.
Take it easy, i know the spike is what u called normal. But im simply just asking if the "glitch" is from the spike. And the ECU does see the spike otherwise u wont be able to datalog it.
Therefore, may be the ECU seeing the spike(glitch?)and closing the throttle longer than it should.
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      09-03-2009, 06:53 PM   #26
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Quote:
Originally Posted by shiv@vishnu View Post
No. It's a "glitch" in the boost control system. By glitch I mean that it works perfectly fine in low boost applications. But in higher boost applications, it expects the turbos to do things which they physically cannot do. As a result, the DME closes the throttle and plays the painful waiting game until the turbos de-spool.

shiv

Shiv my car did it bone stock, with the JB1, and with the JB2 all of which were running at, or less than 12 psi. Either way, glad you have a work around. I think it's some sort of torque management, but regardless its annoying as hell.
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      09-03-2009, 07:29 PM   #27
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Quote:
Originally Posted by dkvby View Post
Take it easy, i know the spike is what u called normal. But im simply just asking if the "glitch" is from the spike. And the ECU does see the spike otherwise u wont be able to datalog it.
Therefore, may be the ECU seeing the spike(glitch?)and closing the throttle longer than it should.
The engine is not "receiving" this boost spike. everything else deosn't matter anyways.
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