03-02-2018, 12:43 AM | #67 |
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Hey boostm3, forgot to post this in the one above, but look at the charts again. In comfort mode, the db’s flutuate more and I noticed this when watching the Ipad during my test. In sport mode, it’s more consistent. I’m not sure what this exactly means but it’s something to take note of. Each chart shows about 15 seconds of history.
In the car, while observing the tach, I didn’t see any difference. |
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03-02-2018, 01:11 AM | #68 |
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Drives: 2018 LBB M2, 6MT
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The flap being open should definitely increase the volume outside the car, and I thought it was already common knowledge here that the flap was open more often in Sport & Sport+?
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2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
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03-02-2018, 03:36 PM | #69 |
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This chart from the owners manual posted on page one of this thread shows how the driving modes affect the exhaust flap (Number 7 in the diagram working in concert with the ASD)
http://f87.bimmerpost.com/forums/sho...6&postcount=22 I park in a parking garage everyday and can clearly hear a difference between the modes. Try this next time you are in a parking garage: quickly accelerate and abruptly let off the throttle. You can hear the turbo spooling up and spooling down much more clearly in the sport modes that have the valve open. This is in addition to the previously mentioned increase in volume and pops/crackles. If you are still in doubt about the valve look up literally any aftermarket exhaust installation and you will see how they either reuse the factory valve or add a secondary valve in addition to it. This also helps explain why one set of exhaust tips gets dirty before the other set, only one set has the valve.
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03-02-2018, 03:49 PM | #70 | |
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Thanks again for your efforts in this area..
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'18 LBB MT M2 Exec pkg, Moonroof, Production 7/6/17 |
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03-02-2018, 03:53 PM | #71 | |
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'18 LBB MT M2 Exec pkg, Moonroof, Production 7/6/17 Last edited by boostm3; 03-02-2018 at 05:20 PM.. |
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