Engine/Transmission (1998.5 - 2002) Only Available VP44 is a HO, will it work on a ETC?

[RobbyRam]

My supplier has a new High Output pump available right now, but he has to order the non HO pump my truck has and I'll get it next week. Can I use the HO VP44 pump on my Y2K ETC Cummins? I also have an edge comp.

Bob in Sacramento

 

[Turbo Tim 1]

According to this thread it will work and you will like the results



TDR HO in an SO



I am looking into this also.

 

[KLockliear]

No, it will not work. The ECM will have to communicate with the FPC and it will not if you mis-match ratings.

 

[ihegdal]

Keith,



I have been running an HO pump on a 2001 ETC engine for several months now without problems, performance is good and no codes have been set since the install. Assuming that I correctly understood the folks at BD, they have been involved in this type of configuration for sometime. No other changes were made to the vehicle to accommodate the pump change.

 

[KatDiesel]

Originally posted by ihegdal

Keith,



I have been running an HO pump on a 2001 ETC engine for several months now without problems, performance is good and no codes have been set since the install.

You also have a near stock truck, correct? I believe it would be a different story if you had bigger injectors and a "major" fueling box.

 

[BatMan01]

I have been told that there is a difference between the injector pop-off calibration in the SO injectors and HO injectors. Supposedly, if this adjustment is not right, it will cause a popping noise from the VP44. I have no idea whether or not it would adversely affect anything all I can say is that, when I ordered my DDII's, a few years ago, I was asked whether they were going into a HO or SO. I was asked again recently when I ordered some EDM injectors from JR.



As for as the ECM being programed differently, would'nt that require a different fueling boxes that tap the pump wire, one for SO's and one for HO's? Yes, I understand that the HO VP44 responds differently to aftermarket fueling boxes than the SO's, but the response difference has more to do with the internal component size of the HO VP44 creating a lower maximum output.



This is coming from someone who is also trying to learn so please take it that as that... .

 

[Turbo Tim 1]

Ok, let me start by saying I don't know everything, infact I probably don't know anything but lets see if these theories hold water.



1. The compression ratio of the HO is higher than the SO correct?



Therefore the injection pressure would also need to be a tad higher for proper atomization and fuel quantity delivery, therefore the need for the injector with different pop off pressures if that is the case. I have heard they are smaller in nozzle size on the HO



2. If the above is the case it would make sense that the HO pump would have to provide more pressure to the injectors?????Thus with SO injectors you would get more fuel for combustion and the reason for a little more SOP feel that ihegdal has.



Can anyone just shoot me out of the water? If it was as simple as swapping pumps, why are there even SO pumps available? Has anyone else heard from BD that you can swap with no problems? Kevin I'd like to hear more if you can. And ditto on what BatMan01 said I am trying to learn something here so take it at that.

 

[HVAC]

VP44

Bob, if you decide to change the pump yourself, I can give you some good advice.

 

[HVAC]

Gear Case

This pic shows the front of the engine with the cover off the gearcase.

 

[jwilliams3]

Kat is right.

If you are near stock, then that HO pump will feel good and give you a little extra power.

With a major fueling box and injectors you will be held back.

Also the issue with different ECM calibrations.

There are different part numbers on these pumps for a reason.



I would advise against it for permanent use.



--Justin