Exhaust flaps open in SPORT mode or SPORT PLUS mode!

[2sporty]

I noticed that my M4's exhaust flaps open in both sport AND sport plus modes. Either my car has different software (perhaps newer) out of the box, or there is a bunch of misinformation floating around.

I read a lot of "the flaps only open in sport plus mode" on this forum.

I don't know if the flaps open even more aggressively in sport plus vs sport, but I do know that they are open at very low RPMs in sport.

[parky1215]

It was always like that. It opens both in sport/sport plus.
Valve closes at low cruise rpm in both mode too.

[Vectors2final]

Under the impression that both Sport/Sport+ was open.

[nasdaq100]

After many discussions about that in other threads, I start to think that there is differences between EU and US cars. I also find that EVEN at low RPM my valves are opened in S and SP like 2sporty. When I read some comments from others who unplugged the valves ******ions, they feel the car louder after the mod. In my case, I have no differences at low RPM plugged or unplugged. The only differences are over 3th gear and cruising.

[castilla]

When moving car at low speeds ( 5-10km/h) its open but after shifting 2nd gear to 3rd it closes suddenly

[Algol]

+1 its got to be a software difference. My (US) M4 valves always stay open at any rpm in sport or sport plus. Regardless of the mode however they stay closed for a few minutes when first starting the car until it warms a little.

[Gstone]

Originally Posted by Algol

+1 its got to be a software difference. My (US) M4 valves always stay open at any rpm in sport or sport plus. Regardless of the mode however they stay closed for a few minutes when first starting the car until it warms a little.

How do you know whether they are open or closed? Can you see them?

[LukasAT]

Originally Posted by Gstone

How do you know whether they are open or closed? Can you see them?

you can hear clearly hear it ... but its not true .. valves are closed in low rpm cruising on higher gear on the highway for example .. doesnt matter in which mode you are in.

[dmk08]

They are always open in sport+. Very noticeable with MPE. Even at low RPM when I give it a blip you can hear the exhaust way more. Not sure about sport but I think they open and close but more aggressive then efficient.

[Gstone]

This is what I don't get. In the do it yourself exhaust mod, the system is unplugged with the valves open. The valves are opened by driving it around in sport or sport plus, correct? But just before you shut the car off you are driving at low speeds and low RPM. But valves are open.

[LukasAT]

Originally Posted by dmk08

They are always open in sport+. Very noticeable with MPE. Even at low RPM when I give it a blip you can hear the exhaust way more. Not sure about sport but I think they open and close but more aggressive then efficient.

thats not true. In my MPE video you can clearly hear everytime you put your foot down the metallic clicking which are the valves opening.

cruising in 7th gear in sport+, putting foot down and you hear the clicking, so the valves were closed!

and you hear 0 diffrence if you are crusing on low rpm and changing through the modes.

[Andrew115]

ASD is also enabled in Sport and Sport+ so that may also play into some of the debate here.

[dmk08]

Originally Posted by LukasAT

thats not true. In my MPE video you can clearly hear everytime you put your foot down the metallic clicking which are the valves opening.

cruising in 7th gear in sport+, putting foot down and you hear the clicking, so the valves were closed!

and you hear 0 diffrence if you are crusing on low rpm and changing through the modes.

Maybe its different in 6mt or my active sound changes but is very noticable difference in sport plus for me. At low rpm starting off the line at low throttle.

[CanAutM3]

On my DCT M4, my impression is that the valve control logic is the same in Sport and Sport+ where the valves are mainly open. The valves close at low RPM cruising in higher gears to minimize drone.

In Efficient, the valves remain closed up to around 4000RPM.

[L3x]

Originally Posted by MRSSIIM3

+1 mine does the same

Well... BMW designed it not like that. Anyway there is no way for you to know if they are open at highway speed at low rpm. They are supposed to be closed in any mode while cruising (note, not at low speed).
Also, people that did the valve mod, disconnect the valve so it stays open complain they have drone at cruising speed. That is axactly why BMW says they close in any mode at highway cruise speed, the second you press the throttle they open up again in sport/sport plus.

Also to op: there is no difference between de behavior of the flaps in sport or sport plus, difference between the settings is more throttle responce and the turbo spools are being kept speed up longer in sport plus.

[JNoSol]

Originally Posted by Gstone

How do you know whether they are open or closed? Can you see them?

Sport opens at certain RPM. Sport Plus keeps them open. Run the car in sport plus for 10min, shut the car off, then unplug the exhaust. It takes less than 10min, enjoy. Save yourself from a $4k exhaust.

Yes, you can see it open looking into the exhaust tips.

[L3x]

Originally Posted by JNoSol

Sport opens at certain RPM. Sport Plus keeps them open. Run the car in sport plus for 10min, shut the car off, then unplug the exhaust. It takes less than 10min, enjoy. Save yourself from a $4k exhaust.

Yes, you can see it open looking into the exhaust tips.

There is no difference in sport and sport plus, flaps are open in sport and sport plus at slow speed. You can see that as you discribed, it only opens at certain rpm in efficiënt mode.
In both sport and sport plus they close at highway speed and low rpm.

[LukasAT]

Originally Posted by JNoSol

Sport opens at certain RPM. Sport Plus keeps them open. Run the car in sport plus for 10min, shut the car off, then unplug the exhaust. It takes less than 10min, enjoy. Save yourself from a $4k exhaust.

Yes, you can see it open looking into the exhaust tips.

sorry but this is just stupid ... I dont know why people think when they unplug the valves that they get a better exhaust note. nothing has change .. it is the same in sport/sport+ under load .. there is NO change at all ^^

I am not saying that a new exhaust is worth $4k but unplugging the exhaut valves changes nothing! it only gets louder on start up, idle and low rpm .. but still its the same exhaust note!

[JNoSol]

Originally Posted by LukasAT

sorry but this is just stupid ... I dont know why people think when they unplug the valves that they get a better exhaust note. nothing has change .. it is the same in sport/sport+ under load .. there is NO change at all ^^

I am not saying that a new exhaust is worth $4k but unplugging the exhaut valves changes nothing! it only gets louder on start up, idle and low rpm .. but still its the same exhaust note!

When you start the car, your exhaust valve will be closed. It will not open unless you're in Sport+ when the car is warm or Sport at WOT. So our OEM exhaust sounds wimpy at startup and rolling around at low RPM. This mod gives you a mean exhaust note at low RPM, in any driving mode. Agree, the sound doesn't change at high RPM/Sport+.

If you ever heard a car with this mod at cold startup, you'll understand. It shakes the house.

The OEM exhaust is very well designed. So well designed that no aftermarket exhaust out there has been able to prove HP gain (ok, 1HP for $4k doesn't' count). With the valve open, our cars sound like an M should at any RPM/Drive Mode. It's not nice to call people's idea stupid (unless someone tries to fit 26" wheels in an M3). We're just all car lovers on this forum and I'm sharing "FREE" tips.

[JNoSol]

Originally Posted by L3x

There is no difference in sport and sport plus, flaps are open in sport and sport plus at slow speed. You can see that as you discribed, it only opens at certain rpm in efficiënt mode.
In both sport and sport plus they close at highway speed and low rpm.

UE and US spec are different, I think. Exhaust will open at certain RPM for Sport, and Open at any RPM for Sport+. I tested this a few times, pretty consistent.

[pigwet]

Watch.

[castilla]

Today I tried do drive in efficient mode , but the horse power screen never passed 300 hp? Does the car cuts power in efficient mode?