When tapping the pump wire with a Edge Comp, what does it do? What does this wire control and what does the Comp do to the signal on that wire? I'm sure it has something to do with fuel, but what? Anyone??

 

What I heard it was (I could be wrong tho) is that it adjust the fuel going into the motor.<br>SD03

 

What it does is is extends the travel of the vain in the VP44. Thus increasing the amount of fuel going into the engine. It also increases the timing and length of the injector pulses.

 

and don't forget the ;D on the face of the driver! <br><br><br>

 

[quote author=BigBlue link=board=7;threadid=13987;start=0#131535 date=1051219577]
What it does is is extends the travel of the vain in the VP44. [/quote]

Incorrect!

What the wire tap boxes do is raise the duration (in milliseconds) that the VP44 fuel dilevery solenoid valve is held shut.

The second solenoid in the pump is used to meter fuel to the
injectors. The solenoid opens the fuel metering valve to allow fuel from
the supply pump to flow into the pumping chamber. Once the pumping chamber
is charged with fuel, the solenoid valve closes. This traps the fuel in
the chamber and allows injection pressure to build. The fuel is routed to
the correct injector by the pump distributor. The distribution port on the
distributor aligns with one of the six outlet ports to distribute fuel to
a given injector. Once the desired amount of fuel has been injected, the
solenoid valve opens, causing the pressure in the pumping chamber to bleed
down, which ends injection. The cycle then begins again for the next
cylinder.

 

Timing is controlled by the other solenoid.

The timing solenoid controls
the position of a cam ring inside the pump by varying internal transfer
pump pressure. The cam ring has evenly spaced lobes around its inner
diameter. The pumping plungers ride on rollers that rotate inside this cam
ring. The rollers follow the inner diameter of the cam ring and push the
pumping plungers inward whenever a cam lobe is encountered, thus building
injection pressure. By rotating the cam ring with the timing solenoid, the
fuel pump control module (FPCM) is able to advance and retard the
injection timing by making the rollers contact the cam lobes either
earlier or later.

 

[quote author=Diesel Freak link=board=7;threadid=13987;start=0#131591 date=1051232933]<br>Timing is controlled by the other solenoid.<br><br>The timing solenoid controls <br> the position of a cam ring inside the pump by varying internal transfer <br> pump pressure. The cam ring has evenly spaced lobes around its inner <br> diameter. The pumping plungers ride on rollers that rotate inside this cam <br> ring. The rollers follow the inner diameter of the cam ring and push the <br> pumping plungers inward whenever a cam lobe is encountered, thus building <br> injection pressure. By rotating the cam ring with the timing solenoid, the <br> fuel pump control module (FPCM) is able to advance and retard the <br> injection timing by making the rollers contact the cam lobes either <br> earlier or later. <br><br>[/quote]<br><br>Wow. Very eloquent and informative answer. Thanks...

 

I was close. I knew it had something to do with the rotor vain.

 

So, the Comp (or whatever pierced wire fueling box) is just adding a signal to the existing one to keep vanes or whatever open or closed longer right?

Since the original connection isn't broken, the original signal must still exist on the wire.

Now that Dodge and Bosch are well aware of piercing methods, would it be feasable or even practical to cut the original signal completely and just use the signal from the fueling box?

Maybe not on existing boxes, but forthcoming versions?

Just some random thoughts.


phox

 

The best way we found is to use a soldering gun to melt the coating on the wire exposing the wire. Then we got some solder and solder the stinking wire to the pump wire. With those peircing things you have a chance of cutting the wire apart or you just don't get it fully.

 

[quote author=phox_mulder link=board=7;threadid=13987;start=0#131667 date=1051241888]<br>So, the Comp (or whatever pierced wire fueling box) is just adding a signal to the existing one to keep vanes or whatever open or closed longer right?<br><br>Since the original connection isn't broken, the original signal must still exist on the wire.<br><br>Now that Dodge and Bosch are well aware of piercing methods, would it be feasable or even practical to cut the original signal completely and just use the signal from the fueling box?<br><br>Maybe not on existing boxes, but forthcoming versions?<br><br>Just some random thoughts.<br><br><br>phox<br>[/quote]<br><br>the VP44 is limited via the software method (via the bus). thats why the pump wire is needed -- the comp box controls the solenoid directly, above and beyond that which the VP44 will allow via bus commands. <br><br>but no -- I believe the timing information sent over the bus is still required. you can't do everything via the pump wire.

 

[quote author=Doug link=board=7;threadid=13987;start=0#132000 date=1051313796]<br>the VP44 is limited via the software method (via the bus). [/quote]<br><br>Read me!

 

pump wire= ........quote from diesel frank, very interesting though, thanks