05-23-2017, 05:33 AM | #1 |
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help needed - exhasut 'pop' gone now ??
hi all
when placed in "sport" and sometimes in "efficient"....upon high revving, the exhaust pop that is normal after gear changes- has now disappeared.... Has this happened to any one ...... ?? is this a common thing ?? no work / modification / changes in drive style / fuel/gas change NOTHING has changed, except this sound is not there anymore..... all help is appreciated.... |
05-23-2017, 06:43 AM | #2 |
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Go to sport plus and accelerate with a quick shift, that should tell you if its gone or not.
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05-23-2017, 07:50 AM | #3 |
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The "popping" is more pronounced in colder weather. As we approach summer you may not hear it as much.
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05-23-2017, 08:42 AM | #4 |
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Yes - in sport plus - still no pop noise
Thanks for the note about weather - though I'm in Australia mate - weather is getting colder So again - anyone else ?? |
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05-23-2017, 09:33 AM | #5 |
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Could it be the gas? Did you fill up at a different gas station recently?
From my understanding the pops is coming from unburt fuel igniting inside the exhaust system so just thinking if you got a crappy tank of gas recently the ecu adjusted to it somehow.
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05-23-2017, 11:13 AM | #6 |
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Full throttle/ shift mode 3 on trans doesn't work?
Gas won't have any effect on this. The shift farts are with throttle input. I forget the actual % it is, but if you're just puttering around it won't do it, but 50% + it'll fart |
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05-24-2017, 02:35 AM | #9 |
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05-24-2017, 09:28 AM | #12 |
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There is a valve on each exhaust pipe and I believe it is controlled by an actuator - many have debated when they open. On my previous M5 a lot of guys wired them open so the exhaust would be louder. My guess would be that your actuator isnt triggering them to open, hence less noise. Have the dealer take a look.
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05-24-2017, 12:01 PM | #13 |
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I only get that "pop" when I'm nearly at redline when I shift. At least into the the yellowline. (is that a term? at the "yellowline" )
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05-24-2017, 12:56 PM | #15 |
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Same here, sometimes even lower - maybe because ours are Carbon Black.
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05-30-2017, 04:05 PM | #18 |
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I know you said its fixed but I'm curious to know if maybe your car wasn't completely warmed up. The only time i was never able to get the pop was when i started it on cold waited for the car to lower its tone after warming up for a minute and taking off and hitting redline shortly after. Its always worked for me after at least 10-15 minutes of the car being driven.
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06-01-2017, 09:19 AM | #19 | |
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