I have an 85 chevy k2500 with a 350 block bored .030 over. it has flat top pistons, 5.7 rods, very mild cam, with tbi heads and basic tbi setup out of a 91 suburban. The conversion went well but I never seem to get good mileage. The truck has 4.10 gears and seems to run better at part throttle. If I mash the throttle it just bogs out a little and slowly comes to life. I installed a 180 thermostat awhile ago and it helped. I have to separate data logs that I run this morning. one with 87 octane, and the other with 91 octane. the tank was on E as usual, so the fuel test is real close.
It is backed with a 700r4, I have played with the cable and feel that it is shifting fine. just doesn't kick down as solid as I feel it should. The gear ratio with the engine I feel should be great low end. But is very sluggish and very hard on fuel. 8-10 mpg.
The knock counts seem high, and the other readings I am starting to learn. I am starting to make sense of a few things, but need a little help if anyone is interested in taking a look at the data?
Bookmarks