P-Pump Coversion

[jabird]

P-Pump Conversion

If I do a conversion on my 98. 5 24v, do I have to use a stock 12v lift pump? If I install a modified p-pump, do I need to compensate with more fuel volume and preassure? Could the fass pump I have now handel a modified p-pump? What are guys useing to supply there p-pumps after they have modified them or is stock good enough? Just dont think my vp-44 is going to cut it anymore. Thank you in advance

 

[TxDieselKid]

If I do a conversion on my 98. 5 24v, do I have to use a stock 12v lift pump?

no.

If I install a modified p-pump, do I need to compensate with more fuel volume and preassure?

more then what? if you mean what the stock 24v LP can put out, I would say that it wouldn't hurt to change to a more reliable pump.

Could the fass pump I have now handel a modified p-pump?

how modified? enough to make 500hp then I would say your ok. Just remmeber that the FASS puts out at a different pressure then what the p-pump is getting from the mechinal LP.

What are guys useing to supply there p-pumps after they have modified them or is stock good enough?

again, how modified? I know of some running the stock 12v lift pump making 600hp, and I know of some who are way above that using a supply pump that attaches to the front of the motor, like what DTT is offering for the 24v.

Just dont think my vp-44 is going to cut it anymore. Thank you in advance

I have thought the same thing for a while. Schied Diesel offers a p-pump conversion and I'm sure Van Haisley could put one together for you also.

 

[RHARVEY]

I talked to Harry @ PDR about this conversion and he said that its alot of $$$$$$$$$$$$$$$$$$$.



Rick

 

[Joseph Donnelly]

The P pump conversion is not cost effective for most people. You can get good power out of the VP44, it is emissions legal on visual inspection, and you can buy spare lift and VP pumps cheaper than making the conversion.

 

[jabird]

RonA, what was the ballpark price of the conversion, minus the p-pump.

 

[Bpostel]

jabird,

Give J. R. Adkins a call, he's the one that done my conversion. We used an Aeromotive A1000 pump, its more than capable to handle the pressure needed for the p-pump.

 

[jabird]

I guess it really dosent matter but, why were RonA's responcenes pulled from this posting? I know I'm not crazy becuase his replyes are in my e-mail. I probably will give JR a call. I was just hopeing to see how different people did their set-up.

 

[jabird]

When it comes to the size of the injection lines, what size should i look into? I see some aftermarkets out there offered in a . 078 and a . 093 dia. What is the size of a stock set?

 

[Bpostel]

Were running the . 093's on my truck. Can't remember what the stock lines are, probably don't want to run the . 120's though.

 

[Reb.B]

it really depends on your set up. I've done the conversion several times. In my 99 i just rebuilt the engine into a 12v. It cost me $80 to be able to run 4300 rpm, on a 24v it will cost $2000 to run 4300 safely. It is alot easier to put a p-pump on a standard shift truck. If you have an auto, then its easier to do a 98. 5-2000. 5 truck. It doesn't cost that much money, it just depends how nice you want it. In a standard shift truck i think its easier to convert it with a 98 12v wiring harness and pcm. In a 98-2000 auto, then you re-wire the tps, and hang the old ecm on the side of the frame. On a 2000. 5 and above its a pain. You need to build a Cam pos sen. on the new gear case. It never works out right. If you do do the conversion, especilly in a standard shift, i think its best to have Piers build you a 12V cam with a 24V grind on it, so you can put a mechanical lift pump on it. The whole purpose for doing the conversion in the first place is to make the truck the most reliable that you can. If anybody wants to buy one of these engines already built with 6,800 miles or is in the Fresno area, we have one built, its really a neat setup.

 

[Vaughn MacKenzie]

Anyone thinking about a conversion may consider reading this about someone wanting to covert back to a VP44: http://www.nwbombers.com/forum/index.php?showtopic=14652