IHcornbinder
Registered User
So i just changed the pump on my 86 6.9. My buddy a the wrecking yard found me pump from a 94 turbo with only 98k on it from an f350. I couldn't be more happy with the results. I cannot believe the power my truck has now. However i have one complaint, It seems that the governor is set much lower than my old pump. I don't have a tach in the truck but i do have a test&tune with a tach and i could only get it to turn 2900rmps in the driveway. I was hooking on to the signal wire on Alternator (its a chevy CS130With the old pump i could run the truck past 85mph to around 90 or so before it would level out and now its 75mph. Also, when you stick your foot in it the trany (C6) cannot shift fast enough to keep up. It will run up on the gov for a good 2-3 seconds before it shifts. I guess i'm getting the benefit of the engine de-fueling before a shift but it is kind of annoying when you go to pass someone and your waiting on the tranny. I have adjusted the vacuum modulator the best i can with out replacing it with a custom adjustable aftermarket one. But the real problem is the governor and i would like to know the proper way to tweek it on the truck. I really don't want to pull a good running pump and send it off to be bench tested and i don't trust the local diesel shops here. Can anyone help me out please?