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F22 / F23 2 Series (2014 - Current)
The 2 Series coupe is the replacement for the E82/E88 1 series coupe. Production starts in November 2013 on the 228i (N20) and M235i (N55) coupes. Look for them in dealerships in February 2014. The convertible F23 2 series will follow in the fall of 2014.

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  #1  
Old 01-08-2016, 01:27 PM
olehead olehead is offline
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Dual Exhaust Cut off valve

Does anyone have any idea why BMW only exhausts thru one side until you reach a certain rpm - I never paid much attention to this until one cold day I was warming up my M235 and saw the exhaust coming out the right side only - I am no mechanic but this makes no sense at all!!!
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  #2  
Old 01-08-2016, 02:47 PM
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Zooks527 Zooks527 is online now
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One side is closed to keep startup noise down and to help the system warm up faster. If you don't want it to work this way, there's a connector under the left side pipe. Unplug it when the valve inside the pipe is open and it will stay open all the time.
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  #3  
Old 02-02-2017, 10:13 AM
PeterWT PeterWT is offline
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Quote:
Originally Posted by Zooks527 View Post
One side is closed to keep startup noise down and to help the system warm up faster. If you don't want it to work this way, there's a connector under the left side pipe. Unplug it when the valve inside the pipe is open and it will stay open all the time.
Hi Zooks,
Old thread resurrection here. Thanks for the info.
I am assuming this applies to the M240i as well. I would like the valve to be open all the time.
  • So, if I start the car, let it warm up and switch to "Sport" or "Sport+", the valve should be fully open at that point, correct?
  • Then, if unplug the harness, the valve will always remain fully open, regardless of the engine temp, throttle position or drive mode selected, correct?
  • And, this will not result in error codes or CELs?
Thanks in advance for your response.
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Last edited by PeterWT; 02-02-2017 at 05:46 PM.
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  #4  
Old 02-02-2017, 04:20 PM
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mecodoug mecodoug is offline
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Are you sure the M240 ever closes one off? This morning when my car was warming up I saw smoke on both sides.
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  #5  
Old 02-02-2017, 04:32 PM
PeterWT PeterWT is offline
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Originally Posted by mecodoug View Post
Are you sure the M240 ever closes one off? This morning when my car was warming up I saw smoke on both sides.
Yes. I felt it, when the engine was cold, in both Comfort and Sport modes and the left was closed. Once the engine was warm, it felt like the left was open in both modes at idle. But, it was hard to tell for sure if it was fully open or partially open. Maybe it stays fully open after warm up, regardless of driving mode and throttle position? If so, then I don't need to unplug it.
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Last edited by PeterWT; 02-02-2017 at 05:46 PM.
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  #6  
Old 02-03-2017, 05:33 AM
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mecodoug mecodoug is offline
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Yes, I checked mine this morning and it was closed for several minutes. I don't have any issues with the design, though I suppose there is some chance the flap will get stuck at some point.
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  #7  
Old 02-03-2017, 01:12 PM
PeterWT PeterWT is offline
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I just looked into the tailpipe at idle, after warm up and the flap is fully open, regardless of drive mode setting.
So, it seems the only time it's closed is on cold start.
If that's the case, I don't think there's any point in unplugging it.
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  #8  
Old 02-04-2017, 05:46 AM
mrkrad mrkrad is offline
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how hard is it to put a check valve on the motor to jam it open all the time? My old 335is just used a one-way-check valve small sized to keep the valve open all the time. sounded mean as heck with the 335is exhaust system! No CEL either!
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Old 02-04-2017, 07:53 AM
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Zooks527 Zooks527 is online now
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Quote:
Originally Posted by mrkrad View Post
how hard is it to put a check valve on the motor to jam it open all the time? My old 335is just used a one-way-check valve small sized to keep the valve open all the time. sounded mean as heck with the 335is exhaust system! No CEL either!
The 335is used a pneumatic valve, which could be disconnected or disabled by blocking the vacuum line (the "golf tee mod"). The F22 uses an electric valve. However, unlike the 335is, which opened and closed based on engine speed, the valve on the F22 is used during warmup only and is open the rest of the time.

I had the valve on my E92 locked open, but as the F22 is open most of the time anyway, I didn't bother with it locking it open. If you like waking up the neighbors in the morning, disabling the motor is your only option.
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Last edited by Zooks527; 02-04-2017 at 05:48 PM.
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  #10  
Old 02-04-2017, 08:09 AM
p912guy p912guy is online now
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My M235i is plenty loud enough when I first start it in the morning. But then again, I just ordered the Technic PNP ASD bypass harness. I have MP Exhaust because it came that way with the MP rear splitter. While I am glad my car came that way, I probably wouldn't have ordered it that way. I like cruising quietly in a stealth manor - don't need folks turning heads as I pass by because my car "sounds" fast. We already have a few guys in the neighborhood that wake up folks with their Harley's.
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  #11  
Old 02-04-2017, 12:59 PM
PeterWT PeterWT is offline
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Quote:
Originally Posted by Zooks527 View Post
...However, unlike the 335is, which opened an closed based on engine speed, the valve on the F22 is used during warmup only and is open the rest of the time...
I figured this out by testing and came to the same conclusion. No point in disconnecting it.
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