Found a good read on EST modules and spark latency tables. What does this mean? Well could be as much as 11 degrees difference in what is at timing mark and what is in bin! Could also mean difference is adding 2 degrees over 3000 RPM or subtracting 4 degrees at over 300 RPM depending on which EST!

What really caught my eye was latency tables for LS1 PCM with coil on cylinder are all same for all RPM. So guys doing LS1 PCM swaps could have some serious timing issues!

http://www.thirdgen.org/techboard/di...ncy-table.html