08-18-2019, 09:52 AM | #1 |
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Exhaust flap activation
Does anyone know what’s going on in comfort, sport and sport+?
I had assumed in comfort they remain closed regardless of throttle position. Sport closed at low throttle position, open at full throttle, closed at highway speeds. Sport+ open most if not all of the time. Just finished installing the TechnicPnP (TechnicPnP.com) ASD removal harness this morning. Very happy with the results but now a bit confused on the exhaust flap positions within the different driving modes. |
08-21-2019, 03:53 PM | #3 |
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More complex than that.
Comfort does open at higher load / rpm. Sport open from idle then closes about 3k then opens about 3.5k. Closes higher up on light load. Sport+ open more than sport but not sure exactly. |
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08-21-2019, 07:11 PM | #4 |
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Its vacuum/pressure activated so even in Efficient mode, sometimes they can open up under load. Likewise, even in Sport+ mode, if there isn't sufficient vacuum pressure, the valves will stay closed. The modes simply change the threshold to how much pressure is required to actuates the valves opening and closing.
EDIT: I'm wrong on this ^
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2019 M2C Sunset Orange 6MT
Eventuri Intakes Eisenmann Valved Full Exhaust Last edited by tokki; 08-23-2019 at 01:09 AM.. Reason: wrong info |
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08-21-2019, 08:36 PM | #6 |
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1. Press the power button without pressing the brake pedal
2. Set Sport+ Mode through M buttons on steering wheel 3. Press on the Accelerator half way through at least (car is off) 4. Start the car while pressing the brake pedal Now your car starts up with valves open 5. Switch the car off and get underneath the rear after it cools down 6. Remove actuator cables on both left and right side Now your car always has its flaps open 7. Drive for a week or so with this setup and then you will recognize when it is open or not With ASD bypassed it's much easier because everything you hear is real |
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08-22-2019, 12:17 AM | #7 | |
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Quote:
They are operated by electric stepper motors and controlled directly by the DME. They only open / close when the DME requests it in accordance with the software mapping. Even the old vacuum version pre F8x didn't open due to load. Vacuum was provided by avacuum pump and stored in vacuum canisters for use so it didn't run out. |
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08-22-2019, 09:23 PM | #8 | |
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Quote:
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2019 M2C Sunset Orange 6MT
Eventuri Intakes Eisenmann Valved Full Exhaust |
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08-24-2019, 06:53 AM | #9 |
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I'm looking at the Bimmerlink app just so that I can keep the exhaust valves open. Any long term issues with keeping the valves always open? I actually like the sound of the car - just want a little more of it!
If I want the valves open all the time do I have to use the app each time I start the car or is the last setting saved? Last edited by cb804; 08-24-2019 at 11:54 AM.. |
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