08-29-2020, 06:06 PM | #1 |
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Exhaust flap controller.
I've read just about everything there is here on the exhaust flap mod and various approaches.
It is my understanding that the exhaust flaps are in the open position on a dead cold star up. Could the electrical connectors to the controllers be disconnected at this time, right at cold start-up? |
08-31-2020, 01:26 AM | #2 | ||
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08-31-2020, 02:08 AM | #3 |
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There are complicated solutions to permanently opening your exhaust flaps.... ie: Piggyback tuning, coding, aftermarket electronic devices, etc. Maybe you'll get check engine lights... maybe you won't. Maybe it will be fine forever, maybe it will revert to stock when you get an update. There is no clear answer on whether or not "pulling the electrical connector" will throw a CEL. Some have done it successfully. Some have had their gauge clusters light up like a Christmas tree.
And there is an easy way: Pull the pins, and tack weld the flaps open. All the "pin" does, is serve as a mechanical connection from the electronic module to the flapper valve itself. Once you pull the pin... the electronic valve continues to operate as normal, and the car doesn't know anything is different (No CELs ever). The car still "thinks" that it is operating the flapper valve normally. If you're worried about it being "too loud".... don't be. It's barely a noticeable difference inside the car. Outside the car, it sounds "slightly" healthier, but again, not a "significant" change. Plus, it's 100% free, or "maybe" a $50 job if you pay someone to do it. Most importantly, the car has no idea anything was changed... no CELs.
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15+ PAGE BUILD THREAD:https://g05.bimmerpost.com/forums/sh....php?t=1694019 690HP / 928nM Dynotune:https://g05.bimmerpost.com/forums/sh....php?t=1729813 6-Piston/4-piston BBK:https://g05.bimmerpost.com/forums/sh....php?t=2097342 Last edited by Ninefourteener; 08-31-2020 at 02:13 AM.. |
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08-31-2020, 11:18 AM | #4 | |
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08-31-2020, 06:26 PM | #5 | |
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And.... simply "pulling the pin" is rather difficult by itself. It's jammed in there pretty tight. I actually had to loosen the electrical modules (3 10mm bolts if I recall) just to be able to pull the pin out. I think you are confusing "pulling the pin" with "disconnecting the plug". As I mentioned earlier, there are multiple theories about disconnecting the plug during a cold start, or in sport plus mode... or (gulp) while driving 40mph (good luck with that one.... please video it if you try). Some people have had success. Some people's dash lit up like a xmas tree with CELs. I think you need to remove the panels (six 8mm bolts each side) and visually take a look at what you're dealing with. This will all make more sense. "Pulling the plug" theory: By disconnecting the electrical connection to the flapper motor at "exactly" the right time, the motor, pin, and flapper valve will be permanently "stuck" in the open position. The downside: it might not work, and it may throw CELs. It also may "undo" itself when you get an update. The upside: If it works (that's a big IF), it is easily reversible. "Pulling the pin" theory: By pulling the pin between the electrical flapper motor and the mechanical flapper valve, the motor continues to operate as normal, while accomplishing no mechanical action. The downside: The mechanical flapper valve needs to be spot welded open or it will rattle. Also, welding is not as easily reversible. The upside: No chance of a CEL, ever, and no chance of the mod failing or reverting, ever. |
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08-31-2020, 06:35 PM | #6 |
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Far Left - exhaust pipe (with unseen flapper valve inside)
Left - mechanical flapper valve pivot point Center - flapper valve pin Right - electronic flapper valve motor Far right (unseen in pic) - electrical plug to flapper motor |
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09-01-2020, 09:10 AM | #7 |
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Well most people just pull the fuse to disable the flap. No one has got a CEL that I've seen doing it that way.
And to take the guess work out of knowing whether the flap is open, just purchase Bimmerlink (iOS/Android) for about $30 to open the flap. No need to do any silly pulling the fuse whilst driving antics. It's a useful app for other things like checking your battery status. At the end of the day it's also very easy to undo - just plug the fuse back in! |
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09-01-2020, 08:50 PM | #8 | |
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09-01-2020, 09:17 PM | #9 | ||
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09-01-2020, 11:49 PM | #10 |
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There is definitely drone that was noticeable at the start, but like Lexx said I don't notice it anymore! Very surprised my wife didn't complain lol
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09-12-2020, 08:34 PM | #11 | ||
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Sorry a bit confused by your post .. If we remove the fuse to disable then how will the Bimmerlink app Open/Close the valve? Or are you suggesting Bimmerlink as an alternative to the fuse option? I have a g05 40i is there a noticeable difference in the exhaust? |
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09-12-2020, 09:06 PM | #12 | ||
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It does make quite an audible difference on 40i. Overall it's great, but can generate a low frequency drone at constant highway speed RPMs — you get used to it, but something to keep in mind. Alternately, just keep the BT OBD interface plugged in and use Bimmerlink to open and close the flap manually on demand whenever you want, no fuse or the other two techniques needed.
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09-13-2020, 10:04 AM | #13 | |
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09-13-2020, 10:22 AM | #14 | ||
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09-13-2020, 11:57 AM | #15 | |||
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09-16-2020, 06:27 AM | #16 | |||
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09-16-2020, 06:46 AM | #17 | ||||
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Bimmerlink = starts closed and manually opened by starting app and/or tapping app button, while keeping an OBD interface always plugged in. Depends on what you want from opening the flap. Starting with flap open sounds great, you'd definitely miss that (in addition to convenience) without fuse pull or one of the other two techniques to keep the flap always open (do some forum searches for many threads on those). On the other hand, Bimmerlink let's you open and close while in motion at will.
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09-16-2020, 01:37 PM | #18 | |||||
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09-16-2020, 03:14 PM | #19 |
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Literally the first returned result for "flap fuse" search: https://www.bimmerpost.com/forums/sh...php?p=24653223
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09-17-2020, 08:11 AM | #20 |
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I can report that Bimmerlink on Android can't open or close valves while the car is in drive, only works when the car is in park(M50i). Pulled the fuse and all is good.
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09-18-2020, 07:13 AM | #22 | |
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The diagram doesnt make sense to me |
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