by s4door » Sun Sep 04, 2016 1:30 pm
Hello all. I am reaching out for some advice on where to go from here with my truck. My signature below describes what I have. About 2 years ago when my NV4500 went bad, I put a 2006 Allison 1000 in my truck. This was quite a project. My problem is mainly poor and inconsistent mileage. I average 14-15 mpg running empty normal driving. I might get 16-17 on the highway which is respectable. Towing is 10-13 depending on weight. Before the Allison, I would average 18-19 driving around and closer to 20 on the highway if I kept it under 70. Towing mpg's are the same. Towing with the Allison is MUCH better than with the NV4500 though. I am wondering if I have a problem with my VE pump. I had the pump rebuilt but it really didn't seem to help. I was running an industrial 190 hp pump with no KSB. My local diesel shop had always said try to find a pump that came on a pickup truck. They claimed that a pickup truck pump would have a better torque curve, applying power ect. I liked the idea of the KSB to help eliminate smoking when it was cold. I found a pump and had it rebuilt. I really didn't notice any difference in performance but do have a problem with the KSB. When I have the KSB wired up, the truck smokes white smoke worse than if it is not connected. I pointed this out to the shop but they can't find a problem. They checked timing with a dial indicator and said it was in the 1.32 range. A blow by test and compression test was also done. Compression all 6 within 5# of 375. Blow by test was a 9 figure which they said was way under what a worn out motor would be. Engine has around 275-300,000. It just acts like the pump isn't just right. I know several other friends that have P-Pump automatics and they all do much better on mileage. This engine always dropped mileage in large chunks when any trailer was hooked up to it. I am wondering if the additional load that the Allison 1000 is putting on this motor just can't run efficient anymore. I've tried about every fuel adjustment/ combination possible. Stock pin vs M&H pin. Timing up, timing down. Fuel screw, starwheel, AFC you name it. No difference except for performance so I keep it tuned where it runs good and has the most power since it doesn't help the mileage any tuning it to be a pig. I've been driving this truck for about 7 years so I'm pretty familiar with all the obvious tweeks that can be done to the VE. Should I try a place like Columbus Diesel to look at my pump or consider a P-Pump motor? I'll keep the truck at least another 10 years. Driven daily for personal and business use. Any suggestions would be welcomed.
1992 F350 Crew cab 4x4 DRW. 1993 5.9 with 2001 intercooler, PDR Super S300, 4" exhaust with magnaflow muffler and 12" resonator, custom air intake, cooler tubes intake horn, 3:73 gears, 235/85/16 Nitto Highway tires, 2006 Allsion 1000 6spd auto, stock injectors, M&H Stage 2 fuel pin (slightly modified)