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  #1  
Old 10-05-2012, 12:10 AM
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DIY Exhaust Brake

Ok I don't know if anyone has seen this somewhere eles or tried it but I found this browsiing the web looking for new and functional things to do with my 1995 7.3 while I'm change Injectors, HPOP, Turbo (among other things). Like I really needed to do more but I saw this and figured what the heck! Any way just looking for some feed-back.

"The Engine Exhaust Back Pressure Valve (EBPV) is a butterfly type valve located on the outlet of the turbocharger, between the turbine and the down pipe. It is controlled by the Power train Control Module (PCM), and activated by engine oil pressure. Its purpose is to decrease engine warm up time in cold weather by restricting exhaust flow out of the engine. It can be very easily and very inexpensively converted into an engine exhaust brake by adding some simple wiring and a switch.

The valve is very practical for assisting braking. When used correctly its braking effect can be compared to the restriction gained by downshifting one gear while descending a hill. The valve is most valuable to braking when engine speed is between 2500 and 3000 RPM. Unfortunately, it will lose the engine braking abilities when engine speed drops below 2000 RPM.

The following method outlines the manner in which the EBPV can be converted to a braking device. The following will cover any vehicle equipped with a manual transmission. Vehicles equipped with automatic transmissions will require an additional circuit to be added in order to maintain torque converter lockup while the exhaust brake is activated. That circuit will be addressed at the end of this article, however the majority of this article is applicable for both transmission types.

In order to control the function of the EBPV, I recommend using a 3-position switch. This type of switch will control the Valve in the following manner:

Switch in the OFF Position (center position): The EBPV will function normally, as it would for a stock vehicle. This means that the valve will only actuate in order to warm up the engine.

Switch in the "A" ON Position: the EBPV closes and remains closed until the switch is turned OFF.

Switch in the B ON Position: the EBPV will close whenever the brake pedal is pressed, and will open when the pedal is released. There will be a 2-3 second lag for the exhaust valve to close upon stepping on the brake. Thus, it is important to understand that when using it in the "B" ON position to push the pedal and hold it down with steady pressure. The reason for keeping pedal pressure is that the EBPV actuator is receiving power from the brake light circuit when the switch is in this position. Thus, pumping the brakes or releasing the pedal will cause the valve to deactivate or open. Furthermore, once the brake is applied again it will take another two seconds for the EBPV to activate again. Unfortunately, pumping the brake pedal will result in the exhaust valve remaining in a constant open position. This will provide ZERO engine braking force. To prevent this less than desirable phenomenon from happening, it is important the operator keep his foot on the brake lightly enough that the brake light switch is continually activated. I prefer touching and holding my pedal just hard enough for the brake lights to come on; then, when I hear the EBPV close (it makes a distinct hissing), I begin applying additional pressure to the brake pedal. Reducing brake pedal pressure can be done without losing exhaust-braking force, as long as there is enough pedal pressure maintained to keep the brake lights on. "
now, I have the rest of the artical and it has tools/materials/proceedures.
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Old 10-05-2012, 03:20 AM
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I did mine a little different.

3 position switch, up is for engine braking (will come back to this in a min), off (middle) is off!, and down is normal ford function.

I don't know how electrically inclined you are but this is the basics I did.

for engine braking, I have mine wired using the brake light circuit also but It will only engage when neither the brakes or throttle is active. I have a switch mounted to my throttle pedal and when released, it supplies power to the switch (in the up position). then, it runs through a normally closed relay controlled by the brake light circuit. if the brake lights are active, it will open the relay and not supply voltage to the ebpv.

for the "off" postion, my reasoning here is, sometimes I just cant stand hearing that thing! lol

For regular ford function, I don't really know why I did this. seemed like I might want it but rarely ever use it.

If you want a more detailed write up of what I did, don't be afraid to ask. Also, I don't know how the OBS are but the SD programming keeps the tc locked (auto) all the way down to around 40 mph for engine braking already. I did not include any of the wiring to lock the tc in my wiring. I just let fords programming do that part and it works good.
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Old 10-05-2012, 06:38 AM
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So all in all it works pretty good then? Do you do enough towing to notice a differance with it? I have a wiring set-up to use to manually engage the TQ Converter if needed, as I have a '95 with the E4OD. I will post the rest of the instructions and materials list so everyone can see.
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Old 10-05-2012, 06:42 AM
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Mod & Article by Jonathan Ryan


The Engine Exhaust Back Pressure Valve (EBPV) is a butterfly type valve located on the outlet of the turbocharger, between the turbine and the down pipe. It is controlled by the Power train Control Module (PCM), and activated by engine oil pressure. Its purpose is to decrease engine warm up time in cold weather by restricting exhaust flow out of the engine. It can be very easily and very inexpensively converted into an engine exhaust brake by adding some simple wiring and a switch.

The valve is very practical for assisting braking. When used correctly its braking effect can be compared to the restriction gained by downshifting one gear while descending a hill. The valve is most valuable to braking when engine speed is between 2500 and 3000 RPM. Unfortunately, it will lose the engine braking abilities when engine speed drops below 2000 RPM.

The following method outlines the manner in which the EBPV can be converted to a braking device. The following will cover any vehicle equipped with a manual transmission. Vehicles equipped with automatic transmissions will require an additional circuit to be added in order to maintain torque converter lockup while the exhaust brake is activated. That circuit will be addressed at the end of this article, however the majority of this article is applicable for both transmission types.

In order to control the function of the EBPV, I recommend using a 3-position switch. This type of switch will control the Valve in the following manner:

Switch in the OFF Position (center position): The EBPV will function normally, as it would for a stock vehicle. This means that the valve will only actuate in order to warm up the engine.

Switch in the "A" ON Position: the EBPV closes and remains closed until the switch is turned OFF.

Switch in the “B” ON Position: the EBPV will close whenever the brake pedal is pressed, and will open when the pedal is released. There will be a 2-3 second lag for the exhaust valve to close upon stepping on the brake. Thus, it is important to understand that when using it in the "B" ON position to push the pedal and hold it down with steady pressure. The reason for keeping pedal pressure is that the EBPV actuator is receiving power from the brake light circuit when the switch is in this position. Thus, pumping the brakes or releasing the pedal will cause the valve to deactivate or open. Furthermore, once the brake is applied again it will take another two seconds for the EBPV to activate again. Unfortunately, pumping the brake pedal will result in the exhaust valve remaining in a constant open position. This will provide ZERO engine braking force. To prevent this less than desirable phenomenon from happening, it is important the operator keep his foot on the brake lightly enough that the brake light switch is continually activated. I prefer touching and holding my pedal just hard enough for the brake lights to come on; then, when I hear the EBPV close (it makes a distinct hissing), I begin applying additional pressure to the brake pedal. Reducing brake pedal pressure can be done without losing exhaust-braking force, as long as there is enough pedal pressure maintained to keep the brake lights on.

Materials:

• (1) ON-OFF-ON type Heavy Duty Double-Pole Double-Throw (DPDT) toggle switch. It will have connections for 6 wires on the back, and the switch will have 3 positions UP=ON, CENTER=OFF, DOWN=ON. RS (Radio Shack)# 275-1533A $2.49 or 275-710 $2.99 • 25'-30' of 18 gauge wire. 5'-7' each of 4 different colors is best. • (10-12) Ring or Spade terminals for wire connections. 18-22 gauge are red. RS# 64-3032A or 64-3033A $1.49 (4-6) Butt connectors for wires. 18-22 gauge are red. RS# 64-3037A $1.49 • (2) Rectifier Diodes. A diode is the equivalent on an electrical check valve, allowing current to flow in only one direction. RS# 276-1114
• (2) Optional Mini Indicator lamps. RS# 276-085A (red) 276-084A (green) $1.99 each. (By using the switch indicator lights, the operator immediately knows how the EBPV is activated or not.)
• 10' Split loom for protecting wires. RS# 278-1264 $3.99
• (10) Wire ties.
• (1) Inline fuse holder. RS# 270-1213 $1.99
• Electrical tape. I recommend Liquid Electrical Tape as being better for almost everything.
• Tape and Marker (In order to label wires.)

Tools:

• Wire cutters/strippers
• Screw Drivers
• Drill w/ bits up to 7/16"
• Volt/Ohm Meter, or at least a test light.
• Soldering Iron is recommended but not essential.
• Torx bits &/or 1/4" drive metric sockets to remove dashboard trim to install switch.

Procedure:

Decide on a place in the dash to install the switch. I installed mine in the black panel just to the right of the "Wait to Start" light. There is room for 2-3 switches there.

Remove the necessary trim and molding around the steering column / instrument panel to access the reverse side of where you want the switch. Drill a 1/2" hole, and install the switch. Re-install the molding to make sure it fits into place when the switch is installed. Then, remove the switch and the molding again for ease of access while wiring.

Wire #1: Decide what you will use for a positive power source. Insure that this source is one that is "ON" only when the ignition is in the “ON” position. I recommend the 8 gauge, gray/yellow wire in the bundle under the steering column. You can also tap a fuse in the fuse panel. Run wire [#1] from the source to the switch, connecting it to terminal A2. I numbered the terminals as viewed from the back of the switch Install the inline fuse holder on this line. Make sure to leave 6"-12" or more of slack on all the wires. You can always bundle them up later.

Wire #2: Decide placement of a negative power point or ground, and run a wire from this to the switch, connecting it to terminal C1.

Connect one light to terminals A1 and C2; this is light A. Connect the other light to terminals B1 and C2; this is light B. Drill holes for the lights just above and below the switch. Install the lights with B in the top hole, and A in the bottom. I recommend this because when the switch is down, contact is made between A+C; when the switch is up, contact is between B+C. For simplicity, the diagram does not show the lights "crossed" like this.

Remove the black-hinged cover from over the fuel filter area in the engine compartment.

Wires#3 & #4: Run two wires from the switch through the firewall into the engine compartment. Connect one [#3] to terminal C2 and run it to the front of the engine. Connect the other [#4] to terminal B2 and run it to the brake master cylinder. If you have a horizontal diamond shaped plate about 2.5" wide just to the passenger's side of the clutch cylinder, remove the screws and run the wires through it. Otherwise, you may need to drill a hole. I always find that running the wires is the hardest part of any wiring project.

There should be a green wire by the driver's side of the master cylinder in the group of 4 marked "Center High Mount Stop Lamp Feed." This wire most likely will not be connected to anything. This wire is only energized when the brake lights come on. Connect wire [#4] to this one. If this wire is not present, use a voltmeter or test light to find a wire that is hot only when the brake lights are on and connect to that wire instead.

Locate the wires that travel from the PCM to the EBPV. There should be a 2-wire plug just under the turbo compressor. It is located towards the front of the engine between the turbocharger and the fuel pump on the intake side of the turbocharger. The plug is attached to the turbo pedestal. Disconnect this plug, and remove the loom (protective plastic shielding) on the plug side moving away from the turbo, to expose the wires inside. Slide off the loom until it reaches the intersection of the larger wire bundle. This will expose both wires; one wire is black w/gray, the other gray w/red.

The Two Rectifier Diodes that are required will each have a silver band around one end. Twist the wires from the "silver" ends together making a "Y.” The "black" ends will be at the top and the silver ends at the bottom of the "Y.” Cut the gray w/red wire 2"-3" before the plug, strip the insulation back 1/2" or so, and solder the black end on one diode to the end of the cut wire that does NOT go into the plug. Solder the black end on the other diode to wire [#3]; solder the two silver ends to the gray w/red wire that goes into the plug. The diodes are necessary to prevent the brake lights from coming on when the PCM operates the EBPV, and to prevent the PCM from receiving a 12v signal from wire [#1]. If you don't have a soldering iron, you can use crimp connectors.

Coat all the wire connections with several coats of Liquid Electrical Tape, then wrap them with regular electrical tape, and replace the loom. Also, cover wires [#3 & #4] with loom, all the way to the switch. Bundle up any excess wire with wire ties, and secure them all to prevent chafing. Install the switch in its hole, and replace the dash trim.

Automatic Transmission Circuit:

If the intention is to use the EBPV as a brake with an Automatic Transmission equipped vehicle, then an additional circuit is required in order to reap the most engine braking benefit from this application. This circuit will keep the torque converter locked up while the valve is in an activated state. In effect, it maintains engine RPM in relation to ground speed and prevents transmission disconnection, which would result in loss of engine speed, ultimately reducing the effectiveness of the exhaust valve as an engine brake.

Auto Trans Circuit Procedure: Run a wire from [#3] to connect to the TC lockup circuit. Install a diode on that wire with the silver end towards the transmission.
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Old 10-05-2012, 07:30 AM
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Quote:
Originally Posted by PoppaSmurff View Post
So all in all it works pretty good then? Do you do enough towing to notice a differance with it? I have a wiring set-up to use to manually engage the TQ Converter if needed, as I have a '95 with the E4OD. I will post the rest of the instructions and materials list so everyone can see.
It works but I have nothing to compare to except with it shut off. I have never had an aftermarket engine brake or rode in a truck with one.
i can say that there is a difference in just letting off the throttle and using the ebpv as a brake. I have towed a car on a small trailer so no, I dont do much towing. If you are in a NEED for an engine brake due to decending grades or something then I would do more research.
I did this with mine because I was irritated with hearing that valve close when cold and pissing neighbors off. I was jist going to unplug it but I am a tinkerer so I decided to put it on a simple on/off switch. When thinking it through I decided, why not! Might as well make a brake out of it and see how it does.

I also have a bad ebps tube. It is broke and leaking off pre-turbo pressure. It may work better with this fixed or mess things up! I have no idea. Some people have complained about exhaust valves floating because of doing this but I have not experienced that although I do have the exhaust leak.
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Old 10-05-2012, 07:35 AM
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Quote:
Originally Posted by PoppaSmurff View Post
So all in all it works pretty good then? Do you do enough towing to notice a differance with it? I have a wiring set-up to use to manually engage the TQ Converter if needed, as I have a '95 with the E4OD. I will post the rest of the instructions and materials list so everyone can see.
I have done in my truck and works fine for me, I have an auto so also have a TC lock up switch to work togheter with the switch of the EBPV.

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Old 10-05-2012, 07:38 AM
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Quote:
Originally Posted by Turbostang500 View Post
It works but I have nothing to compare to except with it shut off. I have never had an aftermarket engine brake or rode in a truck with one.
i can say that there is a difference in just letting off the throttle and using the ebpv as a brake. I have towed a car on a small trailer so no, I dont do much towing. If you are in a NEED for an engine brake due to decending grades or something then I would do more research.
I did this with mine because I was irritated with hearing that valve close when cold and pissing neighbors off. I was jist going to unplug it but I am a tinkerer so I decided to put it on a simple on/off switch. When thinking it through I decided, why not! Might as well make a brake out of it and see how it does.

I also have a bad ebps tube. It is broke and leaking off pre-turbo pressure. It may work better with this fixed or mess things up! I have no idea. Some people have complained about exhaust valves floating because of doing this but I have not experienced that although I do have the exhaust leak.
Actually an engine brake its different and cant be use or adapt to our engines, its an exhaust brake.

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Old 10-05-2012, 07:42 AM
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While this is a functional way to turn your EBPV into an exhaust brake function, I'd like to mention that we can also control this with programming. So we offer a 'decel' tune that will close the butterfly valve when you switch our F5 or F6 to that position, we also make some changes with the transmission strategies to keep the converter locked and increase pressure to the coast clutches. So if you're currently running one of our chips or looking to purchase one, this tune is an option that wouldn't require any wiring or extra swtichs.
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Old 10-05-2012, 08:27 AM
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Quote:
Originally Posted by Jacob@DP-Tuner View Post
While this is a functional way to turn your EBPV into an exhaust brake function, I'd like to mention that we can also control this with programming. So we offer a 'decel' tune that will close the butterfly valve when you switch our F5 or F6 to that position, we also make some changes with the transmission strategies to keep the converter locked and increase pressure to the coast clutches. So if you're currently running one of our chips or looking to purchase one, this tune is an option that wouldn't require any wiring or extra swtichs.
That is an even easyer way than getting greasy again (darn) maybe I'll get a hold of ya for some more info!! Thanks
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