Opening MPE Valve at Engine Start

[kumkeet]

2017 Comp Pack F80 with MPE.
I know the steps.
1. Press start button without brake
2. Switch to Sport Plus
3. Step on accelerator to open the valve
4. Step on brake and press start for loud startup

Step 3 used to work for me. I could hear the valve open with a light 'beep' sound.

Not sure whether because the software has been updated, but now it doesn't beep open anymore.

But still, once the engine fires up, i can hear that the exhaust is much louder. And when i switch it back to efficient at this stage, i can hear the valve close.

This means that when the engine fires up, that's the exact moment that the valve opens. (Perhaps the roar is so loud that I can't hear the valve open or the beep) and it stays open.

Anyone with newer software versions or newer cars experience this?

[EricP3]

It worked for me but I have a 2016. As soon as I put it in sport+ with the engine off and pushed down the throttle I didn't hear a beep but I could actually hear the flap open from the back of my car with my windows down.

If you want to keep them open all the time you should just do the exhaust flap mod by disconnecting the connectors to the exhaust. Of course you will never be able to close the flaps if you do this until you plug them back in. 100% reversible and takes like 5-10min.

https://f80.bimmerpost.com/forums/sh....php?t=1223399

[jmg]

My M3 CS has them open from factory at start no matter what. The above trick worked on my civiv M3 with MPE however. I noticed that the valves closed after startup no matter what-even if I do the above trick or put it in sport or sport+. It warms the car up faster in efficient, which is probably why they coded it. If I put it in sport, the valves won't open until the engine is warm... which takes about 30-40 seconds.

[kumkeet]

Originally Posted by kumkeet

2017 Comp Pack F80 with MPE.
I know the steps.
1. Press start button without brake
2. Switch to Sport Plus
3. Step on accelerator to open the valve
4. Step on brake and press start for loud startup

Step 3 used to work for me. I could hear the valve open with a light 'beep' sound.

Not sure whether because the software has been updated, but now it doesn't beep open anymore.

But still, once the engine fires up, i can hear that the exhaust is much louder. And when i switch it back to efficient at this stage, i can hear the valve close.

This means that when the engine fires up, that's the exact moment that the valve opens. (Perhaps the roar is so loud that I can't hear the valve open or the beep) and it stays open.

Anyone with newer software versions or newer cars experience this?

Ok so i tried again last night and went out of the car after each step to physically check the valve. And I realised that once I am at Step 2, (i.e. press sport or sport plus when electronics are turned on), the valves open without requiring any stepping on accelerator.

And just like the description of the CS by jmg, the valves open at start up no matter which mode I set. If the car is not warm enough, it will automatically close the valve after start up. If it is warm enough and sport setting was selected, it will stay open.

Another strange thing I noticed is that once the engine is cool, the valve will close when i turn off the car even if it was at sport mode. If however, the car is warm when i stop the car, the valves will stay open if i stopped at sport mode.

Weird software.

[PhatLyfe]

I have a 2018 f83 and has a explosive start up and then quiets down after it warms up. I've not changed anything, maybe previous owner did?

[six75LT]

i think the valve opens up during the startup but then closes shortly after, even if you're in sport plus. think the only way around this is to use a valve controller/tune to keep the valves always open. thats what i did at least... and there is a noticeable difference with starting with the valves open using a valve controller vs the method you described

[horsepower_and_hounds]

When car is cold thee will close during cat warm up so you can hit the button and they will still be closed unless you stomp the pedal. when the car is warm they will open right away when button it pushed since there is no need for cat warm up