Originally posted by TxDieselKid
Justin,
It seems that you have some high emotions about this subject. I hope your taking this conversation as just an exchange of ideas.
I didn't say that everybody should want this, but I think it is the best of all worlds, power, reliablity, and drivablity. It's a known fact the P gives the best in throttle responce, and milage.
As for your reference to Nathen's numbers, first let me say there is no doubt that Nathen has worked hard for them, and deserves respect. However it is not a stock pump. By piercing the wire with the COMP box that he has it is no longer stock. The pump fuels at additional levels because of the modification. I understand that most won't have this view, but that's how I see it.
Just like the p, there are more modifications that can be made to the VP that will provide even more fuel.
As for cost of converting, I know where to get the parts for about $1500 not including the pump, which you can buy on ebay for $350. If you do all the labor yourself then you end up spending what, about $2200 after nick-nacks? I nkow people that have been through 3 VP injection pump. 3 * $1300 = $3900. To me it makes more since to put a p on there and never have to worry about it again.
Now I don't have to worry about rack travel because I do have a VP, but I do have to worry about the taxing strain that larger injectors do put on the VP.
As for 1,000hp, well lets just say that's been done, just not on the dyno, and not for public display. If you want a public display of it, just wait because there is a 24v-P that will do it within a year. 
Andrew, I didn't want to come off as emotional. I just feel strongly that we as TDR members want to serve the other members by giving the soundest advice possible.
I am glad you feel the the P-pump is the best of all worlds. I would disagree with your statement about it being a "known fact". It's hard to say that something that is as subjective as throttle response is a "known fact". And mileage is apples to oranges, becuase you're comparing two completely different injection systems and a 12V engine to a 24V engine and attributing the mileage difference to the injection pump? Do you have mileage data from a p-pump conversion that shows the PUMP to be the source of the better mileage?
The P-pump DOES have almost unquestionable reliability. But it is quite a bit more complex than a VP, since so many of the functions that the VP does electronically, the P must do mechanically. This makes it more flexible, yes, but also MUCH more difficult to tune. Furthermore, the p-pump can lose calibration, unlike the VP.
If you are going to be consitent you HAVE to compare a stock pump to a stock pump. If you consider a tapped VP to be modified, well then how about a P-pump with a 10 plate? is that "stock" to you? If you make an honest comparison, even a 215hp pump wont fuel much without modifications. Go ahead and draw whatever lines you wish to, but you ought to make the comparisons valid. Tapping the wire on a VP is no different than messing with plates, DVs and timing on a p-pump.
Furthermore, you cost references really seal the deal. If you... . this and that. Well, most of us can't get the parts that cheap. Most of us CAN'T do the labor ourselves. And even with your very generous cost estimates, you still end up spending almost 4 grand. You can get some twins for 4 grand.
The position of my argument is this: the p-pump conversion is not a cost-effective modification, and well past the point of diminishing returns. Thus, it's only suitable for those at the very forefront of development who are concerned with all-out HP, not with cost-effectiveness.
There are many arguments of the greatness of a 12V engine. But the p-pump conversion is an option that the overwhelming majority of 24V owners ought not to consider.
Doug is a pioneer with lots of his time and money involved in pushing the envelope. Clearly, his case is a rare one. The 99. 9% of the rest of us would not be financially ahead from a p-pump conversion in our quests for more HP.
Justin
Attention: TDR Forum Junkies 
but i would try the conversion in a minute i have a very good friend that has worked with pumps fo rmany years not a well known guy but he is just as good retired now. so i will try it if i can or if i find another truck like i want just for the heck of it.
