Question about a BMW X1 exhaust.

"The Crazy Kanuck; RIP Oppositelock" (jukesjukesjukes)
10/13/2016 at 19:35 • Filed to: None

Today driving home from work I was following a X1. It has 2 exhaust tips. The left one look normal, but the right tip looked blocked off. Later behind it at a red light it was open. I kept on watching, and it took off. Around 15-20kph it closed off. Why would it do that?

DISCUSSION (15)

Vicente Esteve > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:38

Sport Exhaust with a valve opener?

The Crazy Kanuck; RIP Oppositelock > Vicente Esteve
10/13/2016 at 19:39

You would think that it would open, no close once it goes faster.

BeaterGT > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:40

‘bet it got sumthen to darr wit emishuns

Aaron M - MasoFiST > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:41

Most/all of the N52s have an exhaust like this with the flapper valve, I think it’s mostly for noise reduction at lower speeds/smaller throttle openings. There’s the “golf tee mod” which is just using a golf tee to force the valve open.

Trunk Impaired 318 > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:42

Noise control from what I’ve heard

Arch Duke Maxyenko, Shit Talk Extraordinaire > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:45

At a certain rpm the vacuum opens up the valve so that you can here more exhaust sound. It shuts once you dip below the rpm to prevent droning.

e36Jeff now drives a ZHP > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 19:56

My e36 had the butterfly valve in the exhaust. It was vacuum controlled in that car, so it would open on heavy throttle application and close at light application. I assume it’s computer controlled now, but probably follows the same open/close scheme, it probably opened while he was accelerating up to speed, then closed once he got out of the throttle.

Leadbull > Arch Duke Maxyenko, Shit Talk Extraordinaire
10/13/2016 at 19:57

Who do you think you are, some kind of engineer?

Arch Duke Maxyenko, Shit Talk Extraordinaire > Leadbull
10/13/2016 at 19:59

No, but I did stay in a Holiday Inn Express last night.

Leadbull > Arch Duke Maxyenko, Shit Talk Extraordinaire
10/13/2016 at 20:07

I stay at Arby’s because they have The Meats ™ .

Vicente Esteve > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 20:12

From sport mode to Eco?

Zipppy, Mazdurp builder, Probeski owner and former ricerboy > The Crazy Kanuck; RIP Oppositelock
10/13/2016 at 21:15

my father’s e90 has the same system. standard BMW

AMGtech - now with more recalls! > Arch Duke Maxyenko, Shit Talk Extraordinaire
10/13/2016 at 21:40

I suspect your theory is correct but I doubt it uses vacuum. Only because Mercedes uses electric motors for the same thing.

Arch Duke Maxyenko, Shit Talk Extraordinaire > AMGtech - now with more recalls!
10/14/2016 at 00:22

My 1er had the exact same butterfly valve, it’s vacuum.

AMGtech - now with more recalls! > Arch Duke Maxyenko, Shit Talk Extraordinaire
10/14/2016 at 01:48

Oh ok. Weird though.