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BMW 3-Series (E90 E92) Forum
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06-20-2014, 08:55 PM | #3 |
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06-20-2014, 09:12 PM | #4 |
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BT cable/software can also reset just throttle adaptions and menu option 1-7 on JB4 will reset all adaptions.
Your idle may go wacky when you do this. If it does, just shut off engine, turn ignition back on and hold throttle WOT for 30 seconds. After that just start the car back up and the cars idle should be fine. |
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06-22-2014, 05:40 AM | #7 |
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From my experience from being stock, piggybacked, or ST'ed it seems that the logic in the dme does this on purpose only when you are within a couple hundred RPM of redline. It's almost like another over engineered logic to either reduce spikes at the turbos or run some cooler air thru the engine after a high load pull. I wouldn't worry too much about it.
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335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP . |
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06-22-2014, 10:24 PM | #9 | |
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06-22-2014, 10:30 PM | #11 | |
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on a side note, It did it without the JB4...it did exactly what its doing now bone stock!! I sent terry JB4 all this VIA email, and he confirmed that the jb4 did not have any calibration to remove the throttle body spike...nothing they can do. I think at this point a reflash of the DME is the only option as it looks like this issue I have might be a feature BMW coded deep into the logic of the DME to reduce boost lag during shifts...it'll always hold 5psi It's a huge drivability issue for me tho...I really wanna get rid of this |
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06-22-2014, 10:56 PM | #12 | |
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If this is true, I guess a cobb DME reflash would remove this feature? Or alteast give us access to the throttle body reference maps, in hopes of maybe removing this spike? |
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06-22-2014, 10:57 PM | #13 |
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06-23-2014, 06:16 AM | #15 |
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I spent some tim chasing this a couple years ago. It's some logic in the DME that permits it to happen, and is perfectly normal. I assumed it was for an OEM shift softening technique.
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06-23-2014, 07:17 AM | #16 | ||
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Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits!
335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP . |
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