Does it ever stop??....plus de flap?

[outnumbered]

Originally Posted by Bounce

But with the flap removed you the noise all the time,You don't with the sport button pressed.

I thought Sport opened the flap all the time.. Does it just open it earlier then ?

[shimmy]

Originally Posted by outnumbered

I thought Sport opened the flap all the time.. Does it just open it earlier then ?

no, just a couple of thousand lower in rev range

[cslsuperfan]

Originally Posted by pops

Already in the habit off pressing the sport button before it comes out of the garage.

Was well trained by Peter

Pops

Martin AKA Trackm3 said he'd had an order for AP's all round from the forum.....

Welcome to the BBK club.

Just ordered Intrax 1K2 Black Titanium from Martin. Bartlett waiting for a delivery

[cslsuperfan]

Originally Posted by pops

Yup, you're right there

I see you're in Welsh Wales, in Conwy for a couple of nights mid June if it's your neck of the woods.

Yes Pops not to far away.....Conwy is famous for its A55 tunnels..great place to test your new SS lightweight race Back box.......when you order one

[73CSL]

flap removed here too ... cant say Ive experienced any downsides , apart from pedestrains turning round earlier to see what's making that noise

[patphnx]

No flap in mine either!

[GregorFuk]

I think running without a flap does decrease the life span of your air filter. It tends to get dirtier faster. I also worry about driving in hard rain, will it cause the filter to get wet? On that one I have no idea.

It's funny this subject has come up as I am currently flap-less but I have a log drive to LeMans coming up. I was considering reinstating the flap for this journey, what are people's thoughts on this?

[MisterCorn]

I haven't looked at removing the flap, but if it really as easy as you say I might give it a go myself, I don't think driving in the rain will be a big issue.

MC

[alexk]

Originally Posted by GregorFuk

I think running without a flap does decrease the life span of your air filter. It tends to get dirtier faster. I also worry about driving in hard rain, will it cause the filter to get wet? On that one I have no idea.

Yes rain will likely go inside the intake manifold.
That's another reason of not using the sport button in heavy rain, avoid rain going inside the intake

[select]

Originally Posted by MisterCorn

I haven't looked at removing the flap, but if it really as easy as you say I might give it a go myself, I don't think driving in the rain will be a big issue.

MC

I removed my flap a couple of weeks after i bought my csl roughly a 1 year ago. I didn't have a single issue since.

Here is how you remove it:
You have to unscrew the flap motor then manually turn the flap open to reveal the 3 hex screws. Remove these and then manouver the flap out of the airbox and then simply screw the flap motor back in.

Btw, does somebody know if removing the flap motor will throw a code? If not i will see what happens when you do, in the next couple of days.

Originally Posted by alexk

Yes rain will likely go inside the intake manifold.
That's another reason of not using the sport button in heavy rain, avoid rain going inside the intake

I don't think rain will get sucked up as far as the air filter. I think the rain drops will hit the first bend of the plastic tube.
Besides i think if they would manage to reach the filter, BMW would have told people in the manuals.

In my opinion the flap is simply used as a means to comply with noise emission laws.
If i remember correctly its actually called "Geräuschklappe", which translates to "Noise Flap", in the ECU.