L31MaxExpress
I'm Awesome
I downloaded the spreadsheet and revisited something I messed with years ago on the 350 vortec when I had a mild cam in it. I have calculated the difference and adjusted the EOIT to ensure that the injectors do not spray fuel until the exhaust valve is nearly closed. With the overlap the 383s cam has it was pulling fuel out of the exhaust valve and smelled like a 60s 2bbl 390 Ford truck even though it had high flow cats. Now the exhaust has zero noticeable smell. The fuel trims were fairly neutral before around -2 to -5%. I have not altered the VE or MAF tables yet to remove the extra fuel, but the fuel trims are removing it. I am working on dialing in part throttle shift points and running timing loops to optimize the part throttle timing at all rpms and loads I will see. I have been using a roughly 1 mile long, 6% grade that has a climbing lane on a minimally traveled country road I drive through to really load the engine at part-throttle from a standstill to highway speeds. I have not checked the fuel economy yet, but with fuel trim reading indicating the PCM is pulling more fuel nearly everywhere it has to be somewhat better. Here are snap shots from 10-75 mph, holding 75 mph uphill, then holding 75 mph on flat land after the climb.
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