tuning ignition timing
Here's a question on ignition timing. Long story short, I've been working for a while on working out the kinks on an engine overhaul, and I just about have it all sorted. It's a built-up 350 with a Crane 227 cam, completely reworked heads, headers, intake, etc. The most fundamental issue has been fuel efficiency - running at about 12-15MPG under all circumstances. The breakthrough came with replacement of the opti vent harness, which was mucking up the opti (among other things). Obviously I replaced the opti at the same time. Since then, it now reads consistently 15-24 MPG (streets vs highway).
The one remaining "issue" is ignition timing. My scanner reports it consistently negative, by about -30 to -50. The question is, is that even a real issue, or is it just a programming thing? I'm not an expert on tuning, so I just installed a mail-order tuned computer from Bryan Herter. But, as I understand it, the computer programming has some sort of baseline setting for ignition timing, and is pulling the timing back because the baseline setting is too high. Is that right? Would it not be possible to just reprogram it with a lower setting for ignition timing? Everything else on the car seems to be running great.
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