3-Way Exhaust Switch
Discussion
I know Bamford Rose install these as part of their standard equipment but has anyone fitted this themselves and/or able to share a guide/instructions? I'd love to have a 3-way exhaust valve switch to flip between 1) always closed, 2) factory default and 3) always open.
PHer Black9 mentioned the below in a thread I found from many years ago
PHer Black9 mentioned the below in a thread I found from many years ago
Black9 said:
Yes it is possible to do but you will need a 3 position switch (on-off-on).
Basically the valves are operated by a feed from the body control module that controls the valve making them open on cold startup.
To make it work silent you would need to take a switched feed from the ignition, that way when you turn the key to position 1 or insert the ECU key it would activate the valves making the exhaust quiet through the entire rev range.
With a 3 position switch you get three options:
Position 1 = Ecu controlled (standard)
Position 2 = Open (fuse 22)
Position 3 = quiet (Closed)
Here is a video on how it works.
http://youtu.be/3NY1sIYMkZc
Basically the valves are operated by a feed from the body control module that controls the valve making them open on cold startup.
To make it work silent you would need to take a switched feed from the ignition, that way when you turn the key to position 1 or insert the ECU key it would activate the valves making the exhaust quiet through the entire rev range.
With a 3 position switch you get three options:
Position 1 = Ecu controlled (standard)
Position 2 = Open (fuse 22)
Position 3 = quiet (Closed)
Here is a video on how it works.
http://youtu.be/3NY1sIYMkZc
Thanks all. Does anyone know how I might go about wiring in a switch myself? Happy to have a crack at it so long as I know what needs to be done.
Out of interest, how much use is the quiet mode given the valves don't open until 4k/3k RPM (i think) in normal/sport mode anyway? Suppose if you're doing some hard driving in the high rev ranges it has appeal beyond the standard fuse-in approach
EVR said:
My advice is to go with the CC Charger remote, less hassle to install, no holes in the dashboard/steering column and works like a charm. Not sure if you can have the always closed with this, but I was not interested.
https://www.cccharger.co.uk
The CC Charger remote essentially flips between having Fuse 15/22 in or out which is great, but not quite as sleek as a discretely fitted 3-way switch (with the benefit of an always quiet mode)https://www.cccharger.co.uk
soofsayer said:
I bought a cc remote and it worked fine. Then I got the BR solution as part of the primary decat solution which as mentioned has the advantage of quiet mode, which does have its uses occasionally. My cc remote (the one that remembers the last setting) is sat unused if anyone is after one at a bargain price.
I'll PM you as while not my preferred solution, I might well be interested in the remote as a temporary solution (and I can always pass it onto another PHer should I change to a switch!)Out of interest, how much use is the quiet mode given the valves don't open until 4k/3k RPM (i think) in normal/sport mode anyway? Suppose if you're doing some hard driving in the high rev ranges it has appeal beyond the standard fuse-in approach
Back my my original post (quoted below), does anyone know how I might go about doing the 3-way switch myself?
Would also be interested in any photos of the BR installed switches which I understand are usually placed quite discretely in the driver footwell
Would also be interested in any photos of the BR installed switches which I understand are usually placed quite discretely in the driver footwell
magycks said:
I know Bamford Rose install these as part of their standard equipment but has anyone fitted this themselves and/or able to share a guide/instructions? I'd love to have a 3-way exhaust valve switch to flip between 1) always closed, 2) factory default and 3) always open.
IainWhy said:
I did it on my uk car, covered here:
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Great posthttps://www.pistonheads.com/gassing/topic.asp?h=0&...
What gauge wire did you use? Think i'm finally going to have a crack at this myself
My MY14 DB9.2 looks to have different wiring looms to the photographs i've seen on guides (photo attached). I had my 3-way switch wired up ready to fit and then see that my connector is grey (not black) and lower row does not have a white wire 4 from the right.
Fuse 15 in rear fusebox (inside boot) is the one linked to the valve (i.e. not fuse 22 like earlier models)
Please can anyone assist?
Fuse 15 in rear fusebox (inside boot) is the one linked to the valve (i.e. not fuse 22 like earlier models)
Please can anyone assist?
edwin83 said:
...I do not see a similar connector with a white wire and my connectors are grey not black, though there is a green one...
Exact same issue hereamv12 said:
I installed one a few years back. I decided to splice into the valve control wire in the drivers footwell.
Awkward to get at, but saved running a cable to the rear fuse box.
[url]
|https://thumbsnap.com/bMvsitkP[/url]
Three way switch fitted into the steering column cowl.
Where did you get the fuse diagram from to work out it's pin 19 in that connector? would like to find out the right wire for my MY14 DB9.2Awkward to get at, but saved running a cable to the rear fuse box.
[url]|https://thumbsnap.com/bMvsitkP[/url]Three way switch fitted into the steering column cowl.
Steering column mounting looks great, though I think below the light control is my favourite
I've got the wiring diagram for the 14MY DB9
I see the white wire going from ECU to bypass valve and that it goes through Fw (forward engine bay), Ca (cabin) then L-br (link bumper, rear).
What I’m still not clear on is how I find the right white wire. There are 3 harnesses (white, green and grey) and quite a few white wires (photo attached)
In the wiring diagram, I see that the engine bay wire meets Cabin wire at C78R1-8. Is this the harness connector? If so, is there a way to identify it that I’m not understanding?
I see the white wire going from ECU to bypass valve and that it goes through Fw (forward engine bay), Ca (cabin) then L-br (link bumper, rear).
What I’m still not clear on is how I find the right white wire. There are 3 harnesses (white, green and grey) and quite a few white wires (photo attached)
In the wiring diagram, I see that the engine bay wire meets Cabin wire at C78R1-8. Is this the harness connector? If so, is there a way to identify it that I’m not understanding?
Complete guide to install 3-Way Switch on DB9.2
This guide is to install a 3-way switch on a MY14 DB9 by splicing a wire in the driver's footwell. There is an alternative which is to splice a wire closer to the exhaust valve, then run the switch to desired location.
The exhaust valve is open (loud) when no power received.
The exhaust valve is closed (quiet) when power is received.
The exhaust valve has power supplied by Fuse 15 in rear (boot) fuse box
By default, exhaust valve behaviour is governed by the ECU. When a signal from the ECU powers the exhaust bypass, the exhaust valve shuts.
The signal is carried along the wire marked in the circuit diagram below.
WARNING: circuit diagram does not apply to earlier vehicles which may use different wire numbers. Known pin locations:
DB9 MY14 (DB9.2): pin 8 (grey connector) - covered explicitly in this guide
DBS 2010: pin 19 (black connector)
V8 Vantage 2006: pin 19 (black connector)
There are three connectors (grey, green & white, from left to right) in the driver footwell, all located to the right of the pedals underneath the carpet roll.
Connector C78R1 is the grey connector. Connection 8 (a white wire, 8 spaces along from left to right) on C78R1 is cut to splice in the 3-way switch. The length of accessible white wire is short, so cut it to leave sufficient length on each side.
The rocker switch connects wire on opposite side to centre wire when pressed down.
The 3-way switch is a SPDT (single pole, double throw) is wired as follows:
When = is selected, 1 & 2 are linked (ECU connected to valve, standard operation, valves controlled by driving mode)
When o is selected, no wires are linked (valve disconnected from ECU and earth, valve always open)
When – is selected, 2 & 3 are linked (valve connected to earth, always quiet, since valve is switched by the earth line). This can be tested by switching the ignition without starting the vehicle’s engine.
Installing 3-way switch under headlight control knob
Switch can be installed in your choice of location. To install under the headlight control knob, the drivers knee roll can be pulle off as a single piece (no screws). Note, there is an air temperature sensor to the left side, on the underside of the plastic grill. This clips in and out fairly easily. Drill a small pilot hole, followed by a hole saw of the right dimensions (20mm in my case), then fit the switch.
|https://thumbsnap.com/gXg3Zgs1[/url]
Note the fit is tight on underside of the knee role, so position your hole accordingly in relation to the headlight control knob (which is best removed via 3 screws and 2 clip on/off connectors to install the switch without risk of damage)
This guide is to install a 3-way switch on a MY14 DB9 by splicing a wire in the driver's footwell. There is an alternative which is to splice a wire closer to the exhaust valve, then run the switch to desired location.
The exhaust valve is open (loud) when no power received.
The exhaust valve is closed (quiet) when power is received.
The exhaust valve has power supplied by Fuse 15 in rear (boot) fuse box
By default, exhaust valve behaviour is governed by the ECU. When a signal from the ECU powers the exhaust bypass, the exhaust valve shuts.
The signal is carried along the wire marked in the circuit diagram below.
WARNING: circuit diagram does not apply to earlier vehicles which may use different wire numbers. Known pin locations:
DB9 MY14 (DB9.2): pin 8 (grey connector) - covered explicitly in this guide
DBS 2010: pin 19 (black connector)
V8 Vantage 2006: pin 19 (black connector)
There are three connectors (grey, green & white, from left to right) in the driver footwell, all located to the right of the pedals underneath the carpet roll.
Connector C78R1 is the grey connector. Connection 8 (a white wire, 8 spaces along from left to right) on C78R1 is cut to splice in the 3-way switch. The length of accessible white wire is short, so cut it to leave sufficient length on each side.
The rocker switch connects wire on opposite side to centre wire when pressed down.
The 3-way switch is a SPDT (single pole, double throw) is wired as follows:
When = is selected, 1 & 2 are linked (ECU connected to valve, standard operation, valves controlled by driving mode)
When o is selected, no wires are linked (valve disconnected from ECU and earth, valve always open)
When – is selected, 2 & 3 are linked (valve connected to earth, always quiet, since valve is switched by the earth line). This can be tested by switching the ignition without starting the vehicle’s engine.
Installing 3-way switch under headlight control knob
Switch can be installed in your choice of location. To install under the headlight control knob, the drivers knee roll can be pulle off as a single piece (no screws). Note, there is an air temperature sensor to the left side, on the underside of the plastic grill. This clips in and out fairly easily. Drill a small pilot hole, followed by a hole saw of the right dimensions (20mm in my case), then fit the switch.
|https://thumbsnap.com/gXg3Zgs1[/url]Note the fit is tight on underside of the knee role, so position your hole accordingly in relation to the headlight control knob (which is best removed via 3 screws and 2 clip on/off connectors to install the switch without risk of damage)
Edited by magycks on Wednesday 17th May 15:16
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