Compression Ignition Addict
Join Date: Oct 2008
Location: Hudson Valley, NY region
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Remember, the V3 operates on "auto" using COOLANT temp of 140*F or higher. The only way we can be certain about other temps and make decisions on how to operate any system (DIY or a kit) is to actually monitor them. As long as your veg oil filter is allowing 50psi or better of fuel pressure, the V3 will run you on veg oil when your COOLANT temp is above 140*F. This is regardless of your actual veg oil temp or motor temp or combustion temp or anything else.
I also added an FPHE and 203* t-stat like David. I went a little further and added HIH and an aux coolant pump, too (this keeps the coolant temps up higher during idling/low-load conditions). My observation is that it isn't worth switching over when the trips are 15-16 miles or less.
My coolant temp hits 140*F after about 3-4 miles in the NY winter (which is where the V3 wants to turn on on "auto"), then it hits 160*F after another 3-4 miles of driving (which is where I turn the switch on to "auto"). I know this because I have a temp sender in the hot coolant line. The EOT is about 130*F when the coolant temp is 140*F and it finally catches up to the coolant at about the 160*F mark, which is why I wait to turn on until that point. I know this because my PHP programmer reads and displays EOT.
After manually switching over at 160*F, I see a veg oil temp of 160*F within another 6-8 miles of driving in the winter. I know this because I have a temp sender in the veg oil fuel line. This makes sense because if we are properly purging 12-14 seconds, we have to burn all the cold diesel out of the injector cups, heads, veg fuel lines, filter, V3 manifold (and FPHE if you have one) before we are actually burning veg... another reason not to burn veg on short trips.
'02 7.3L Excursion Limited; ~225Kmi total; ~140Kmi on WVO
Vegistroke V3 (4/09); HIH, Aux Pump, FPHE (11/10); PHP Gryphon custom; 6637;
WW; Turbomaster; EBPV delete; 4" exhaust; Terminator HPOP; Tru-cool; Evans NPG+;
ARI triple-disc TC; V/B-code springs; Bilsteins; 30mm sway bar; 190A alternator; F650 dash, etc.