88 Ford
Member
So I have been doing some thinking after I first noticed the similarities between a Bosch VP44 and the Stanadyne DS4. I think it is possible to adapt a Cummins Fuel Comp box to gain additional fuel solenoid closure time that the ECM cannot provide. The best boxes would be tha control fuel only. I'm not sure a timing and fuel box would even work plus I would want only the stock ECM controlling timing anyway. The harness would obviously have to be spliced into to make it work but here is how I think it would need to be wired.
The Fuel Inject Control on the DS4= Data Link(+) on the VP44.
-On the VP44, the timing and fuel control signal are both on this same wire but all I think the DS4 would need would be the Fuel Inject Control Signal.
The Diesel Inject Signal on the DS4= Data Link (-) on VP44.
-These are pretty much the return for both signals as I understand it.
Both will have a power and ground wire.
The VP44 has an engine reference signal sent to the pump as well. I'm guessing the optic sensor position signal will need to be tapped and sent to the comp box as well. Maybe it isn't needed. But I am guessing that it is.
Another signal that is sent to the VP44 is the fuel shutoff signal. I'm guessing that will need tapped as well coming from the fuel shutoff solenoid.
The only signal on the VP44 that I have not seen in any Chevy schematics is the low idle select. Is there a signal like this anywhere on the Chevy 6.5? Also I'm not sure how much this signal is even needed.
The last thing that I believe would be needed is to tap into the fuel solenoid pump signal. Essentially a wire is tapped into it and adds additional pulse to the fuel pulse based off the reference engine data. It will hold the fuel solenoid closed longer than the factory ECM is capable of doing which should add quite a bit more fueling capability. What do you all think? Anything that I have not thought about or that I’m wrong on?
Also I found some wiring diagrams of both pumps so you guys can compare but I can't seem to get them to upload on my phone.
The Fuel Inject Control on the DS4= Data Link(+) on the VP44.
-On the VP44, the timing and fuel control signal are both on this same wire but all I think the DS4 would need would be the Fuel Inject Control Signal.
The Diesel Inject Signal on the DS4= Data Link (-) on VP44.
-These are pretty much the return for both signals as I understand it.
Both will have a power and ground wire.
The VP44 has an engine reference signal sent to the pump as well. I'm guessing the optic sensor position signal will need to be tapped and sent to the comp box as well. Maybe it isn't needed. But I am guessing that it is.
Another signal that is sent to the VP44 is the fuel shutoff signal. I'm guessing that will need tapped as well coming from the fuel shutoff solenoid.
The only signal on the VP44 that I have not seen in any Chevy schematics is the low idle select. Is there a signal like this anywhere on the Chevy 6.5? Also I'm not sure how much this signal is even needed.
The last thing that I believe would be needed is to tap into the fuel solenoid pump signal. Essentially a wire is tapped into it and adds additional pulse to the fuel pulse based off the reference engine data. It will hold the fuel solenoid closed longer than the factory ECM is capable of doing which should add quite a bit more fueling capability. What do you all think? Anything that I have not thought about or that I’m wrong on?
Also I found some wiring diagrams of both pumps so you guys can compare but I can't seem to get them to upload on my phone.