[kenshapiro2002]

I'm assuming this feature is controlled by the ECU and not the rider.

 

[Bose]

I'm assuming this feature is controlled by the ECU and not the rider.

Correct same as the 2010 onwards twin cam engine ,well until it seizes up !!
If it happens under warranty no worries ,if it goes after that then just remove the cables and leave the flap fully open ,then the ECU still thinks it's connected otherwise you'll have a fault on the dash if you remove the control box ,same if you fit different headers and remove the exhaust valve !! Enjoy

 

[penner]

thanks for the info what are the disadvantages to leaving the flaps open ? just more noise?

 

[Bose]

thanks for the info what are the disadvantages to leaving the flaps open ? just more noise?

There's no dramas if the valves cables are disconnected and flap fully open as the ECU will think its still operating the flap for( yes more noise at throttle openings),also if the flap in the valve seizes which they can do from carbon build up and stay closed you'll have a real loss of power

No need to worry until its knackered, if it ain't broke don't fixit scenario

 

[cherry street]

so what happens if you swap the entire exhaust, you have to ride with an error code always? Couldn't I just get Motorrad to shut it off?

 

[Bose]

so what happens if you swap the entire exhaust, you have to ride with an error code always? Couldn't I just get Motorrad to shut it off?

It's fine cherry street just remove the cables from the control box as there not required once the valves removed from the exhaust join union ,it's only if you remove the servo box the ECU will show up a fault on the dash ,save your funds for petrol not giving it to a technician to swipe your ECU if it can be done hope this makes sense

 

[cherry street]

It's fine cherry street just remove the cables from the control box as there not required once the valves removed from the exhaust join union ,it's only if you remove the servo box the ECU will show up a fault on the dash ,save your funds for petrol not giving it to a technician to swipe your ECU if it can be done hope this makes sense

thanks Bose, I've had a bit of history with BMW cars and remember that if you wanted anything done it hand to be at with the BMW tekkies. Things are so electronically complicated you need an engineering degree to remove the engine cover

 

[delirii]

What's the real purpose of this inelegant thing? Just reducing the noise? Does it play a negative role on the engine performance?
Anyway, it's one the pieces that is not well integrated in the design of this bike... This black box with the cables is just ugly... As soon as I've got the bike, I'll consider removing it, especially if it restricts in a way or another the engine... which in France is limited to 107hp (and not 110hp everywhere else... thanks to a stupid law)

 

[street]

The flapper on other marques is mostly for noise control. But, every boxer is so quiet that I'm thinking it's not for noise control, but for exhaust tuning. I recall when the first GS's came out with twin cams BMW made a big deal about variable exhaust. The ideal back pressure varies with RPM and throttle. Then again, the GS is pretty loud, so maybe the flapper is just noise control.

FWIW, dealer advised me that if I go with aftermarket headers, go with ones that use the flapper. Better mid range they say.

You could try researching on one of the GS boards. They usually know what they're talking about unlike me.