I haven't converted a Powerstroke, but I can tell you some things about some work I did this past summer converting a New Holland tractor to a two-tank vegetable oil. This tractor was a 6.7 Iveco common-rail. Not a HEUI, but it was similar in being electronically controlled. There was no modification in tuning, but max power was decreased about 80% due to the less energy in VO compared to diesel. You should not need programing, but granted there might be slight and I'm guessing very slight variations being a Ford ECM takes shift points, etc. into consideration based off of throttle position(being you need 25% more fuel to achieve same output). If you want power to return to where you currently are, you could do it with programing, as long as you aren't maxing out the injectors already.
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Thomas H.
'97 F-250 CCSB 7.3L Auto, Gauges, Modded H2E, 285/200% sticks, 7.3L IC, Stealth Dual HPOP, Pheonix chip
'03 F-250 CCSB 6.0L Auto, Gryphon CTS, FICM tuning by PHP, Powermax
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