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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Exhaust flap in open position

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      11-27-2021, 05:52 PM   #1
Paul Moran
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Exhaust flap in open position

Does anyone have sound bits or info on the sound the M340i exhaust makes after the valve has been disconnected in the open position. Do sports mode, comfort mode and eco pro mode sound the same ie loud
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      11-27-2021, 08:00 PM   #2
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Engine tuning changes depending on drive mode too. So comfort and eco pro will be a little louder, but not by much. Sport will be the same as the valve is open in that mode anyway.
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      11-28-2021, 05:27 PM   #3
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Quote:
Originally Posted by v_ckash623 View Post
Engine tuning changes depending on drive mode too. So comfort and eco pro will be a little louder, but not by much. Sport will be the same as the valve is open in that mode anyway.
Can confirm there is a difference even in Sports mode. I have valves fully open via the JB4 and Sports mode the exhaust overrun is especially louder and more prominent at lower RPM. Even as low as 1.5-2k
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      11-30-2021, 11:46 AM   #4
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What is the simplest way to disconnect?

(I ordered AWE anyhow, but I guess I'm curious)
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      11-30-2021, 12:41 PM   #5
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Quote:
Originally Posted by TupperBMW View Post
What is the simplest way to disconnect?

(I ordered AWE anyhow, but I guess I'm curious)
Get the car up to temperature, and throw it in Sport+. Exhaust flap should be open. Leave the car running, unplug the connector and tuck it up (when I tried this on mine, I tucked the connector behind the heat shielding so it didn't get wet). Quick and easy, just don't inhale too much exhaust gas.

Alternatively, if you have Bimmerlink, you can manipulate the exhaust flap via the app, and unplug the connector that way. AFAIK, the valve settings reset so you can't just open them via Bimmerlink and call it a day.
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      11-30-2021, 03:39 PM   #6
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Quote:
Originally Posted by v_ckash623 View Post
Get the car up to temperature, and throw it in Sport+. Exhaust flap should be open. Leave the car running, unplug the connector and tuck it up (when I tried this on mine, I tucked the connector behind the heat shielding so it didn't get wet). Quick and easy, just don't inhale too much exhaust gas.
However, this makes it throw a check engine light, correct?
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      11-30-2021, 03:47 PM   #7
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Quote:
Originally Posted by xnick101 View Post
Quote:
Originally Posted by v_ckash623 View Post
Get the car up to temperature, and throw it in Sport+. Exhaust flap should be open. Leave the car running, unplug the connector and tuck it up (when I tried this on mine, I tucked the connector behind the heat shielding so it didn't get wet). Quick and easy, just don't inhale too much exhaust gas.
However, this makes it throw a check engine light, correct?
Negative. There's a fault code that's saved in memory as the car no longer detects the valve, but it doesn't trigger the check engine light. You'd need a code reader like BimmerLink or ISTA to see the fault code.
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      11-30-2021, 03:48 PM   #8
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Quote:
Originally Posted by v_ckash623 View Post
negative. There's a fault code that's saved in memory as the car no longer detects the valve, but it doesn't trigger the check engine light. You'd need a code reader like bimmerlink or ista to see the fault code.
Ah okay it's just a shadow code. brb! Going to the garage right now!
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      11-30-2021, 05:36 PM   #9
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Geeeez the car now sounds like my F30 335i did with a downpipe on start up!
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      11-30-2021, 09:04 PM   #10
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So the connector just hangs like that? I’m not sure it will just stay stable tucked up into the heat shield like that
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      11-30-2021, 09:06 PM   #11
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Quote:
Originally Posted by TupperBMW View Post
So the connector just hangs like that? I'm not sure it will just stay stable tucked up into the heat shield like that
You have to wrap it in insulation tape first to keep it dry. Then tuck it up under the heat shield. Much much much cheaper the paying for an m performance exhaust!!!😎
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      12-01-2021, 09:03 AM   #12
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^ Interesting.

I guess I should've tried this before ordering the AWE exhaust. Oh well, I'll just wait for my exhaust to arrive
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      12-01-2021, 05:03 PM   #13
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Quote:
Originally Posted by TupperBMW View Post
So the connector just hangs like that? I’m not sure it will just stay stable tucked up into the heat shield like that
The connector is between the heat shield. The heat shield is bolted in. There is absolutely no way it can come out.
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      12-01-2021, 06:49 PM   #14
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Quote:
Originally Posted by TupperBMW View Post
^ Interesting.

I guess I should've tried this before ordering the AWE exhaust. Oh well, I'll just wait for my exhaust to arrive
There is simply no comparison between opening the exhaust flap and the AWE exhaust. Perhaps you were being sarcastic and I didn't pick up on it If so my apologies.....either way you made the right choice and can't wait to read your impressions of your new exhaust
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      12-04-2021, 08:06 AM   #15
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Quote:
Originally Posted by TupperBMW View Post
^ Interesting.

I guess I should've tried this before ordering the AWE exhaust. Oh well, I'll just wait for my exhaust to arrive
You'll love your new exhaust
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      12-10-2021, 03:23 PM   #16
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Quote:
Originally Posted by Paul Moran View Post
Does anyone have sound bits or info on the sound the M340i exhaust makes after the valve has been disconnected in the open position. Do sports mode, comfort mode and eco pro mode sound the same ie loud
[IMG][/IMG][IMG][/IMG]
I just ordered a dummy flap actuator to plug into the exhaust cable
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      12-18-2021, 06:15 PM   #17
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Just to be sure, that dummy encase, is just for preventing water and others to get in or it will prevent the error code to appear in a code reader?
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      12-25-2021, 10:07 AM   #18
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Quote:
Originally Posted by bmwloverm2 View Post
Just to be sure, that dummy encase, is just for preventing water and others to get in or it will prevent the error code to appear in a code reader?
Need to know this too. Following
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      02-16-2022, 01:58 PM   #19
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Quote:
Originally Posted by bmwloverm2 View Post
Just to be sure, that dummy encase, is just for preventing water and others to get in or it will prevent the error code to appear in a code reader?
The dummy flap actuator has a capacitor in it, I don't know what its for, maybe to stop the engine code but I don't know. You can get a male and a female actuator for both ends of the cable
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      02-16-2022, 02:50 PM   #20
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I have mine just unplugged with nothing in it and it does not throw a code. I've been to the dealer few times with it like that also.
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      02-16-2022, 05:04 PM   #21
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Quote:
Originally Posted by v_ckash623 View Post
Engine tuning changes depending on drive mode too. So comfort and eco pro will be a little louder, but not by much. Sport will be the same as the valve is open in that mode anyway.
Quote:
Originally Posted by v_ckash623 View Post
Engine tuning changes depending on drive mode too. So comfort and eco pro will be a little louder, but not by much. Sport will be the same as the valve is open in that mode anyway.
That's incorrect.

The reason why that is, even at operating temperature BMW keeps valves closed until you exceed 30mph, even in sports plus mode.

So having the valve open all the time makes a huge difference at low speed and it sounds nice on a cold start too (if you're into that).

When I had the stock exhaust it was a huge "upgrade" for me, unplugging the exhaust valve in the open position.
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      07-17-2023, 02:10 PM   #22
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Quote:
Originally Posted by Krabbypatty View Post
That's incorrect.

The reason why that is, even at operating temperature BMW keeps valves closed until you exceed 30mph, even in sports plus mode.

So having the valve open all the time makes a huge difference at low speed and it sounds nice on a cold start too (if you're into that).

When I had the stock exhaust it was a huge "upgrade" for me, unplugging the exhaust valve in the open position.
This might be the answer to my post ???
https://g20.bimmerpost.com/forums/sh...1#post30315931

Help me out
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