[BoostedBMW]

Originally Posted by scollins

Beats me, but it opens shortly after startup, stays open and then I can hear it close shortly after shutdown.




Maybe I'm just lucky!

Hah, yes, I guess you could say you're lucky. I had an E46 325ci back in the day and the exhaust flap was stuck open on my car since the first week I had it. It didn't make much of a difference in sound on that car though.

Originally Posted by TiAg335i

Then you're valve is not working correctly...it should close below a certain RPM and when the engine is very cold. It shouldn't be open all the time, that's people do this mod.

You are correct, but its not RPM driven, its based on throttle position. Basically when you are in vac (cruising, partial throttle) the flap is closed, and when you are in boost (moderate throttle, WOT) the flap opens up.

[Lotus99]

Originally Posted by TiAg335i

Then you're valve is not working correctly...it should close below a certain RPM and when the engine is very cold. It shouldn't be open all the time, that's people do this mod.

Can someone tell me pls. how the flap should work? Today I watched after I started the car, and after a minute, the flap opened, and exhaust gas came out of the driver's pipe. So is it supposed to close again before you drive off, and only open above a certain RPM / throttle position?

I don't want to do the mod if for some fluke, my valve is always open... how do I check?