Is my exhaust defective? Sound doesn't change when I switch between engine modes

PizzaHut · 01-31-2018, 01:31 PM

Featured on BIMMERPOST.com

Hey guys, please help me out.

So whenever I switch between Efficient, Sport and Sport Plus, my exhaust note doesn't change. The valves do not open UNTIL I tap on the gas only then is when you'll hear the valves switch and the exhaust gets louder.

I have to tap on the gas, then it switches open the valves. Is this normal operation?

I was under the impression that once you switch between Efficient and Sport/Sport Plus the sound changes immediately without having to tap on the gas to get the valves to open.

Am I crazy? I took it to BMW and the service guy said that's normal, that you need to give it gas before the valves will open and stay open. Is that BS or correct?

Aaaaaaaaa · 01-31-2018, 01:46 PM

I don't appreciate any difference in idle sounds when I switch through the modes.

RickFLM4 · 01-31-2018, 02:00 PM

Service guy is correct. Not BS.

guess2098 · 01-31-2018, 02:10 PM

Valves dont change until you gas it

2kaccordocoupe · 01-31-2018, 02:14 PM

The valves will close right away if you are in one of the sport modes and switch to efficient.

To open them yes you need to tap the gas.

And no they won't stay open all the time even in the sport modes. The car will open and close them while you are driving based on various input.

Rick955 · 01-31-2018, 02:27 PM

No difference just sitting in idle and switching modes.

Paz1 · 01-31-2018, 02:35 PM

Facts. Also in sport mode when at certain speeds the flaps close and when u floor it the flaps open. On my awe exhaust it has a noise from the flaps opening( sounded like a metal mailbox opening and it was embarrassing). I purchased the canflap and it’s one of the best mods I’ve done. Keep em open all the time and once the lady is in vehicle I press it to closed. Huge difference.
Highly recommend to purchase the canflap

dreventador · 01-31-2018, 02:38 PM

Just get a valve controller. Leave them open at all times

F the neighbors

FirstF80InSpace · 01-31-2018, 02:53 PM

If you want noise, just get the Can Flap module. A tap of your BC stalk button will open or close the flaps.

When the car is still cold, you can definitely hear a difference in the idle. Flaps open creates a much deeper rumble.

When the car has warmed up, you won't really hear a difference in idle sitting in the car. However, if you stand outside of the car, you can hear that it's a deeper rumble when the valves are open.

backagain · 01-31-2018, 04:06 PM

You can hear the clicking sound of the flaps opening, when you turn on the power (not igniting yet), switch mode to Sport/Sport+, then push the gas pedal.

PizzaHut · 01-31-2018, 04:55 PM

Awesome, thanks you guys. What a great forum.

NCThreePedals · 01-31-2018, 05:53 PM

Just like the trick if you're untuned and you want to start the car with the valves open. Press the on button without the brake or clutch so it only turns on the electronics then put the car in sport or sport+ and tap the gas and you'll hear the valves open then start her up!

uniqueMR · 01-31-2018, 06:37 PM

Quote:

Originally Posted by 2kaccordocoupe

The valves will close right away if you are in one of the sport modes and switch to efficient.

To open them yes you need to tap the gas.

And no they won't stay open all the time even in the sport modes. The car will open and close them while you are driving based on various input.

mrmoua2u · 02-01-2018, 06:18 PM

Just disconnect the plugs in the back of exhaust. Easily and cheapest way.

bmrwrld · 02-01-2018, 06:27 PM

Yes! Just make sure your flaps are open before you unplug them.

CanAutM3 · 02-01-2018, 06:38 PM

Maybe it is model year thing, but on my early 2015, the valves open as soon as I switch out of Efficient mode at idle.

The engine needs to be out of the start-up sequence though, valves are always closed regardless of mode then.

Tepr05 · 02-02-2018, 07:39 AM

Quote:

Originally Posted by NCThreePedals

Just like the trick if you're untuned and you want to start the car with the valves open. Press the on button without the brake or clutch so it only turns on the electronics then put the car in sport or sport+ and tap the gas and you'll hear the valves open then start her up!

Haven't been able to get this to work on my 2017 CP. Perhaps it's a year/CP thing?

Zayzel · 02-02-2018, 08:36 AM

Quote:

Originally Posted by Tepr05

Haven't been able to get this to work on my 2017 CP. Perhaps it's a year/CP thing?

No, it should work on all current gens.

Time Lord · 02-02-2018, 06:06 PM

i have a 18 cp and it works with the car off

01-31-2018, 01:31 PM	#1
PizzaHut Enlisted Member 31 Rep 33 Posts Drives: 1995 Nissan 300ZX TT Join Date: Jan 2016 Location: CA iTrader: (0)	Is my exhaust defective? Sound doesn't change when I switch between engine modes Featured on BIMMERPOST.com Hey guys, please help me out. So whenever I switch between Efficient, Sport and Sport Plus, my exhaust note doesn't change. The valves do not open UNTIL I tap on the gas only then is when you'll hear the valves switch and the exhaust gets louder. I have to tap on the gas, then it switches open the valves. Is this normal operation? I was under the impression that once you switch between Efficient and Sport/Sport Plus the sound changes immediately without having to tap on the gas to get the valves to open. Am I crazy? I took it to BMW and the service guy said that's normal, that you need to give it gas before the valves will open and stay open. Is that BS or correct?
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01-31-2018, 01:46 PM	#2
Aaaaaaaaa Banned 7559 Rep 5,056 Posts Drives: The other M3 Join Date: Oct 2014 Location: So Cal iTrader: (0)	I don't appreciate any difference in idle sounds when I switch through the modes.
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01-31-2018, 02:00 PM	#3
RickFLM4 Brigadier General 10971 Rep 4,821 Posts Drives: M4 Join Date: Jul 2015 Location: PB County, FL iTrader: (0)	Service guy is correct. Not BS. __________________ Current: 2018 SO/SS F83 ZCP Gone: 2015 SO/SO F82
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01-31-2018, 02:10 PM	#4
guess2098 Major 516 Rep 1,247 Posts Drives: 2022 Taycan GTS, 2018 M4, 2016 Join Date: May 2009 Location: Rowland Heights, CA iTrader: (5)	Valves dont change until you gas it
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01-31-2018, 02:14 PM	#5
2kaccordocoupe Brigadier General 1270 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	The valves will close right away if you are in one of the sport modes and switch to efficient. To open them yes you need to tap the gas. And no they won't stay open all the time even in the sport modes. The car will open and close them while you are driving based on various input.
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01-31-2018, 02:27 PM	#6
Rick955 Captain 459 Rep 843 Posts Drives: 2018 M3 ZCP Join Date: Oct 2012 Location: Connecticut iTrader: (0)	No difference just sitting in idle and switching modes. __________________ Future Order: 2022 M4 Comp X, Portimao/KO Previous: 2018 M3 ZCP, YMB/Silverstone 2015 M3, SO/Black Last edited by Rick955; 01-31-2018 at 02:53 PM..
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01-31-2018, 02:35 PM	#7
Paz1 Banned 218 Rep 665 Posts Drives: 2018 m3 Join Date: Oct 2015 Location: NY iTrader: (1)	Facts. Also in sport mode when at certain speeds the flaps close and when u floor it the flaps open. On my awe exhaust it has a noise from the flaps opening( sounded like a metal mailbox opening and it was embarrassing). I purchased the canflap and it’s one of the best mods I’ve done. Keep em open all the time and once the lady is in vehicle I press it to closed. Huge difference. Highly recommend to purchase the canflap
	Appreciate 0 Quote

01-31-2018, 02:38 PM	#8
dreventador Private First Class 102 Rep 152 Posts Drives: X5, Hellrot F80 M4 Join Date: Jan 2017 Location: NYC iTrader: (1)	Just get a valve controller. Leave them open at all times F the neighbors
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01-31-2018, 02:53 PM	#9
FirstF80InSpace ///M You 344 Rep 619 Posts Drives: 2019 Porsche 718 Cayman S Join Date: Jun 2016 Location: Canada iTrader: (0)	If you want noise, just get the Can Flap module. A tap of your BC stalk button will open or close the flaps. When the car is still cold, you can definitely hear a difference in the idle. Flaps open creates a much deeper rumble. When the car has warmed up, you won't really hear a difference in idle sitting in the car. However, if you stand outside of the car, you can hear that it's a deeper rumble when the valves are open.
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01-31-2018, 04:06 PM	#10
backagain just a fool 345 Rep 675 Posts Drives: 2016 SO coded M3 Join Date: Mar 2016 Location: CA bay area iTrader: (0)	You can hear the clicking sound of the flaps opening, when you turn on the power (not igniting yet), switch mode to Sport/Sport+, then push the gas pedal.
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01-31-2018, 04:55 PM	#11
PizzaHut Enlisted Member 31 Rep 33 Posts Drives: 1995 Nissan 300ZX TT Join Date: Jan 2016 Location: CA iTrader: (0)	Awesome, thanks you guys. What a great forum.
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01-31-2018, 05:53 PM	#12
NCThreePedals First Lieutenant 227 Rep 325 Posts Drives: 981 GT4/Audi Q8/F15 Diesel Join Date: Dec 2017 Location: St Pete, FL iTrader: (0)	Just like the trick if you're untuned and you want to start the car with the valves open. Press the on button without the brake or clutch so it only turns on the electronics then put the car in sport or sport+ and tap the gas and you'll hear the valves open then start her up!
	Appreciate 0 Quote

02-01-2018, 06:18 PM	#14
mrmoua2u Captain 655 Rep 877 Posts Drives: 2018 MW F80 ZCP Join Date: Feb 2014 Location: CA iTrader: (0)	Just disconnect the plugs in the back of exhaust. Easily and cheapest way.
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02-01-2018, 06:27 PM	#15
bmrwrld Lieutenant 158 Rep 490 Posts Drives: BMW Join Date: Dec 2010 Location: So Cal iTrader: (0)	Yes! Just make sure your flaps are open before you unplug them.
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02-01-2018, 06:38 PM	#16
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Maybe it is model year thing, but on my early 2015, the valves open as soon as I switch out of Efficient mode at idle. The engine needs to be out of the start-up sequence though, valves are always closed regardless of mode then. __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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02-02-2018, 06:06 PM	#19
Time Lord BimmerPost Supporting Vendor 125 Rep 698 Posts Drives: 2018 F80 ZCP Join Date: Mar 2011 Location: NW Florida iTrader: (5)	i have a 18 cp and it works with the car off __________________ 2018 F80 ZCP
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