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Flap open or closed...

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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ihadablackdog
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Flap open or closed...

Post by ihadablackdog » Tue Jul 03, 2018 10:13 pm

ok, so silly question coming up:

Is the exhaust flap in only 1 pipe?

Is the exhaust more throaty with the flap open or closed?

Since my engine light came on, the car has had that exhaust noise all the time (all the noise, no performance!). When I poked it with my finger with the engine off, it seemed stuck closed?
2011 E89 sDrive20i

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Smartbear
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Flap open or closed...

Post by Smartbear » Tue Jul 03, 2018 10:24 pm

The exhaust will be more vocal with the flap open, and yes it’s only in one pipe.
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

JamiesZ4
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Flap open or closed...

Post by JamiesZ4 » Wed Jul 04, 2018 12:43 pm

Which leads to a stupid question from me :-)

Is it worth getting a flap in the second pipe? :oops:
Current - E89 Z4 SDrive 3.0i - last of the normally aspirated six cylinders
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Nick9one1
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Flap open or closed...

Post by Nick9one1 » Wed Jul 04, 2018 1:17 pm

Its probably restricting the performance if its stuck closed. Try using something like a screwdriver to force it open.
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Z4monster
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Flap open or closed...

Post by Z4monster » Wed Jul 04, 2018 2:12 pm

The pipe with the flap has a bypass pipe so that even with the flap closed, there is always some exhaust gas escaping on the RHS. You really don't want to block both pipes with a flap as they fail anyway and are better bypassed.

Just done mine which had started to rattle. It's much better without it.
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obewan
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Flap open or closed...

Post by obewan » Wed Jul 04, 2018 5:50 pm

Well, every day is a learning day!
Just been out to check mine - I didn't know that :)
E89 2.0 SDrive MSport
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ihadablackdog
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Flap open or closed...

Post by ihadablackdog » Wed Jul 04, 2018 10:43 pm

With mine it happened as soon as I collected from the dealer after they checked the fault code (going in Friday for further investigation), so I’m wondering if the car is doing it on purpose as part of its reduced power thing? Wouldnt open with my finger when engine off so need to check if its open with engine on.

The flap has sounded bit raspy recently so it might be goosed, but if its jammed shut I dont understand why I get all the loud noise. Need to check position with engine on.
2011 E89 sDrive20i

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Smartbear
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Flap open or closed...

Post by Smartbear » Wed Jul 04, 2018 11:49 pm

ihadablackdog wrote: Wed Jul 04, 2018 10:43 pm With mine it happened as soon as I collected from the dealer after they checked the fault code (going in Friday for further investigation), so I’m wondering if the car is doing it on purpose as part of its reduced power thing? Wouldnt open with my finger when engine off so need to check if its open with engine on.

The flap has sounded bit raspy recently so it might be goosed, but if its jammed shut I dont understand why I get all the loud noise. Need to check position with engine on.
You should be able to open the valve easily with your finger, it’s not attached to a very strong spring.
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

ihadablackdog
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Flap open or closed...

Post by ihadablackdog » Thu Jul 05, 2018 1:56 pm

I’ll push harder (ooooerr), it might be my finger is too weak!
2011 E89 sDrive20i

ihadablackdog
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Flap open or closed...

Post by ihadablackdog » Fri Jul 06, 2018 7:47 am

I looked again last night and it was open. I was able to push it against the spring so thats good.

Its going in to the garage today so hopefully they can fix the engine fault and it will be ok again.

Gonna ask then to check the flap operation anyway whilst they have it in.
2011 E89 sDrive20i

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