Just put a factory ATS turbo on my 86 6.9 with c6, 3.54 diff, 3" exhaust, running waste veg oil diesel blend.
I turned up the IP fuel screw almost a full turn.
Gray haze at WOT. No coal rolling.
Still not getting much better than 15mpg.
If the fuel screw is turned up too much, could I be...
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