Quote:
Originally Posted by davepl
But who cares about the HPT proprietary stuff for a naturally aspirated pickup like this? Are you saying he needs any of that?
I'd unplug the MAF and drive it. The speed density tune is excellent, at least in the LS3. And to be honest I'd trust GM's SD tune a lot more than I would HPT, all else being equal.
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Take this in to consideration. GM's fall back SD mode puts you in a low timing table with most ECU's. Commanded timing in this "low" timing table has anywhere from 10-15* of advance pulled.
In addition every one I have forced in to SD by either unplugging the MAF or failing it through the tune has required VE table clean up. They are no where near stoich at idle/light throttle and are heavily relying on the factory narrow band O2 sensors to compensate which are not tied in to WOT fueling which should absolutely be addressed.