Originally Posted by
dave w
I realize my previous post did not answer any of the above questions.
All engines require fuel / air / spark to run. Sometimes tweaks have to be made to the injector flow setting in the PROM chip for Cam / Heads / Headers to get the engine to run. Sometimes distributor tweaks (advance / retard) are needed for Cam / Heads / Headers to get the engine to run.
Closed Loop BLM's and Closed Loop Spark Advance are essential parameters for tuning, all engines need the correct spark advance / spark table and correct fuel injector flow / fuel table to provide optimal performance.
The spark table is likely the most challenging part of tuning, to much spark advance will damage an engine and not enough spark advance diminishes engine performance and can possibly damage an engine too. Factory spark tables are often a good starting point. Possibly install an aftermarket camshaft that is a clone of a factory camshaft . . . like an aftermarket clone of the LT4 and use the LT4 timing table as a baseline.
One method to figuring out injector flow, is to adjust the injector flow so some of the Closed Loop BLM's are rich and some of the Closed Loop BLM's are lean . . . and fine tune from there.
More than a decade ago, maybe even as far back as two decades ago the "Internet Myth" was MAF was more forgiving for Cam / Heads / Headers. Some of that decades old "Myth" seems everlasting on today's Internet . . . but why? "Myth Busted"
1227165 - "Good "for stock engines
16197427 MPFI - "Better" for Cam / Heads / Headers . . . "Best" with TPI / 4L60E / 4L80E
1227730 - "Better" for Cam / Heads / Header
Dynamic EFI P4 for TPI - "Best" Cam / Heads / Headers . . . "Better" requires piggy-back 16197427 for 4L60E / 4L80E
dave w
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