Module flap control

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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Tarzan
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Module flap control

Post by Tarzan » Wed Jan 15, 2020 9:31 am

has anyone installed this accessory?
https://www.youtube.com/watch?v=uzr4rdSAWdg

If yes it would be nice to have feedback
:thumbsup:

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enuff_zed
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Module flap control

Post by enuff_zed » Wed Jan 15, 2020 10:10 am

Tarzan wrote:
Wed Jan 15, 2020 9:31 am
has anyone installed this accessory?
https://www.youtube.com/watch?v=uzr4rdSAWdg

If yes it would be nice to have feedback
:thumbsup:
Seems a bit of a pointless gimmick to me to be honest. (Just an old farts opinion :D )
But then, mine is stuck permanently open anyway and I'm quite happy with that.
E89 20i SDrive M Sport - Valencia Orange
E85 2.5i (53 plate) - Sterling Grey - Better half's fun car

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Module flap control

Post by Zikim » Wed Jan 15, 2020 10:14 am

I can't see the point in it. The valve's primary function is to make the exhaust quieter on first 30 seconds on start-up when the engine revs faster and fuel is enriched to get the Cats to work efficiently as soon as possible. After this initial period the flap opens, why would you want to make an already quiet exhaust quieter on normal driving?

Owners usually make the Golf Tee mod to increase the noise :)

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Module flap control

Post by Smartbear » Wed Jan 15, 2020 10:55 am

Zikim wrote:
Wed Jan 15, 2020 10:14 am
I can't see the point in it. The valve's primary function is to make the exhaust quieter on first 30 seconds on start-up when the engine revs faster and fuel is enriched to get the Cats to work efficiently as soon as possible. After this initial period the flap opens, why would you want to make an already quiet exhaust quieter on normal driving?

Owners usually make the Golf Tee mod to increase the noise :)
I don’t think the flaps opened constantly after warm-up but at higher revs/throttle openings, mines permanently open & produces more sound than it used to. :?
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

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Module flap control

Post by Smartbear » Wed Jan 15, 2020 11:00 am

Smartbear wrote:
Wed Jan 15, 2020 10:55 am
Zikim wrote:
Wed Jan 15, 2020 10:14 am
I can't see the point in it. The valve's primary function is to make the exhaust quieter on first 30 seconds on start-up when the engine revs faster and fuel is enriched to get the Cats to work efficiently as soon as possible. After this initial period the flap opens, why would you want to make an already quiet exhaust quieter on normal driving?

Owners usually make the Golf Tee mod to increase the noise :)
I don’t think the flaps opened constantly after warm-up but at higher revs/throttle openings, mines permanently open & produces more sound than it used to. :?
Rob
Ps, we’re at cross purposes here, the 35i/35is models use a different form of exhaust flap control to the 20i range :thumbsup:
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

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Tarzan
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Module flap control

Post by Tarzan » Wed Jan 15, 2020 11:44 am

According to my research, only turbo engines have an exhaust valve.
The valve in normal use is not constantly open in fact it depends on the regime.
This gadget allowed to make noise when we want to finally if I understood correctly.
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