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Re: Project 67 GMC custom 6.5 turbo diesel
When I got my reman pump I told the guy to turn the fuel flow all the way up. I found that will less boost the truck would chug (for lack of a better word) just before the shift from second to third around town (th400 trans). With the turbo turned up its smooth, and I'm finding that I have to back off the gas on the hiway at cruising speed, compared to what I was used to with the lower boost levels. So in theory I should be getting better than the 14.5 MPG that I was getting. I'll know after the first weekend in May as I have a swap meet to go to that is a 200 mile round trip.
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