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c0zgrove c0zgrove is offline
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Default B48 exhaust flap open but no pop? - 05-17-2016, 01:26 PM

I thought with the exhaust flap open the exhaust would pop on decel in mid mode similar to the way it does in sport mode.

Does anyone know what else is different in sport mode that causes the exhaust pop?


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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is online now
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Default 05-17-2016, 01:44 PM

Do the exhaust flap commands operate properly? e.g. when you close it can you see its closed?

The flapper just effects the noise volume though. Not exhaust popping. That would need to be done at the DME level to inject extra fuel when the throttle is closed.


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c0zgrove c0zgrove is offline
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Default 05-17-2016, 01:49 PM

Quote:
Originally Posted by Terry @ BMS
Do the exhaust flap commands operate properly? e.g. when you close it can you see its closed?

The flapper just effects the noise volume though. Not exhaust popping. That would need to be done at the DME level to inject extra fuel when the throttle is closed.
Thanks for the reply Terry.

Not sure on the flap commands working as I tested it while driving to work. I can confirm later that the flap is opening/closing and report back.


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anthonyrand anthonyrand is offline
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Default 05-31-2016, 10:05 PM

Quote:
Originally Posted by c0zgrove
I thought with the exhaust flap open the exhaust would pop on decel in mid mode similar to the way it does in sport mode.

Does anyone know what else is different in sport mode that causes the exhaust pop?
i installed the Can Flap OBD2 so i was able to change it between on, off and normal on my 428i. it never worked correctly. No matter what the blinkers said it would be open then closed and then if i was stopped i could hear it change lol but when it was open you'll be able to hear a little pop an back pressure when you let off the throttle. not much thought. Easy way to tell tap a strip pf paper on the bumper in front of each tip. when the flap is open both will move when the flap is closed only one will move
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