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Message: [QUOTE="Charles, post: 1566065, member: 103"] Most things to make power are simpler than building an injection pump, like buying a truck with something other than a 7.3 in it for instance... But full mechanical 7.3's on the other hand have a very special power output not seen otherwise on that platform, and another kind of simplicity in theory of operation even if not in requirements to get it there. And the precise sound, feel and upper rpm fueling window available with mechanically driven P&B's have proven themselves beyond theory. The downsides are a truly huge pump, 8 cyl plus governor, that blows right past the intakes and can be found on the shelves of any shop that keeps unicorns in stock, with a hearty pricetag to go with it.... plus fixed timing and pw relationship, plus the death of easy tachometer, cruise control, rev limit, boost fueling and all else that would be a simple chip setting away if you used the PCM the truck already has available. Imagine a 1500hp P-pumped 7.3 that fired right up at 10 degree temps with very little smoke because the timing was like.... 8 degrees, then when you hammered on, timing worked it's way up to 40 ish by 4000 and 50 ish by 5000... so on and so forth. Need to pull a trailer? One click on the chip... now you went from 800cc with very little aneroid to 180cc and full MAP based fueling. Commonrail could do that, but not right from the PCM, IDM and sensor / instrument package already on the truck, sitting there fully integrated for free. Just lose the Rotella part.... trade it for a cam lobe.... and keep all the rest... Truck is already setup for EUI...... just go from an H... to an M..... and watch out.... [/QUOTE]