Exhaust flap vacuum line

N54gasm

Corporal
Feb 6, 2017
225
97
0
New Freedom
www.Spoolnmotorsports.com
Ride
2008 bmw 335i m sport
So looking to clean up the bay a bit more, and want to re route that ugly vacuum line/remove the exhaust flapper vacuum line. Am fabricating vacuum canisters and going to relocate them with the new turbo/relocated inlets. So my question is, is the vacuum line for the exhaust flapper tee'd into the brake booster line that sits near the left strut tower, tucks under the cowl and runs back to the back?
 

doublespaces

General of the Army
Oct 18, 2016
8,943
4,150
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AZ
Ride
2009 E93 335i
Good question. I'm curious also as I will be using that vacuum line in the back. I'd be more interested, in how to toggle the solenoid in the back manually using a wire up front or something.
 

ryanmamikel

Specialist
Nov 5, 2016
58
27
0
London Ontario, Canada
So looking to clean up the bay a bit more, and want to re route that ugly vacuum line/remove the exhaust flapper vacuum line. Am fabricating vacuum canisters and going to relocate them with the new turbo/relocated inlets. So my question is, is the vacuum line for the exhaust flapper tee'd into the brake booster line that sits near the left strut tower, tucks under the cowl and runs back to the back?

Yes, That line is the supply for the vacuum actuated flapper in the rear.
 
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ryanmamikel

Specialist
Nov 5, 2016
58
27
0
London Ontario, Canada
Good question. I'm curious also as I will be using that vacuum line in the back. I'd be more interested, in how to toggle the solenoid in the back manually using a wire up front or something.

The circuit for the exhaust flap control is very basic. Power from the junction box, ground supplied by the DME. You could install a simple on/off switch to control it. There is the possibility that it is PWM regulated, I would have to scope it to find out. This is the circuit from my 1-series, if you need a more accurate one for you car let me know.
 

rebo0t

Specialist
Mar 14, 2017
59
13
0
Ride
E90 335i
Awesome info, if it is indeed PWM regulated maybe there is a way we can control it. Keep it closed all the time below a certain RPM
 
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ryanmamikel

Specialist
Nov 5, 2016
58
27
0
London Ontario, Canada
Awesome info, if it is indeed PWM regulated maybe there is a way we can control it. Keep it closed all the time below a certain RPM

I was thinking the same thing actually, only have it on a roller dial of some sort, making adjust-ability more than just open/closed. The problem is, I have lots of ideas, just no time to try them out (or not a priority) :(.
 

Cjdzombie

Specialist
Feb 27, 2017
72
12
0
Ride
2011 335i xDrive M-Sport
I just leave mine open all the time. I like the added volume.
 

rebo0t

Specialist
Mar 14, 2017
59
13
0
Ride
E90 335i
I was thinking the same thing actually, only have it on a roller dial of some sort, making adjust-ability more than just open/closed. The problem is, I have lots of ideas, just no time to try them out (or not a priority) :(.

Yessss that would be best. I'll take having it closed under a certain rpm just so I can get out of my area without waking everyone up :)
 

doublespaces

General of the Army
Oct 18, 2016
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2009 E93 335i
I set mine up to trigger my Hobbs switch :)
For your fuel pump? How did you do that? Could you set something up so the power is flowing to that solenoid at all times? I want to insert a wireless relay into the plug right before the solenoid for an easy source of power and control the solenoid with my homelink.
 

jyamona

Captain
Platinum Vendor
Nov 7, 2016
1,300
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Philly
For your fuel pump? How did you do that? Could you set something up so the power is flowing to that solenoid at all times? I want to insert a wireless relay into the plug right before the solenoid for an easy source of power and control the solenoid with my homelink.

I have written a lot of custom logic for myself :) You can make the flap always open / have power with the currently available exhaust flapper tables in the XDF.
 

doublespaces

General of the Army
Oct 18, 2016
8,943
4,150
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AZ
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2009 E93 335i
I have written a lot of custom logic for myself :) You can make the flap always open / have power with the currently available exhaust flapper tables in the XDF.
You gonna make me use my brain. Jeez
 

Jsherry20

Sergeant
Dec 21, 2016
313
47
0
The circuit for the exhaust flap control is very basic. Power from the junction box, ground supplied by the DME. You could install a simple on/off switch to control it. There is the possibility that it is PWM regulated, I would have to scope it to find out. This is the circuit from my 1-series, if you need a more accurate one for you car let me know.
Sweetness