Quote:
Originally Posted by bcredliner
It is likely the reason you didn't notice a lose of performance when you removed the flap on your diesel was because it may not have been sealing for some time.
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While DISA valves and swirl flaps look similar, they work rather differently. The swirl flaps (multiple) in the diesels do not contribute much to power gain - they are more about engine efficiency. Almost no one has ever noticed the removal of the swirl flaps in the BMW diesels, even if removed when working properly.
But while they work differently, they fail in a similar way, with similar results!
Lots of info. here: -
BMW diesel engine SWIRL FLAPS - all you ever need to know
It's an interesting read, even if you don't own a diesel.
And since I've gone and hi-jacked
Shel's thread, I'll mention that
Shel is dealing with the DISA flap on a 3.0i (or at least
Shel's previous questions have been about a 3.0i so I'm assuming this question relates to the same car...).