I could swear that PE mode adds timing, but I can't find it anywhere. I have found B5908, Fuel Mixture Spark Correction, but I don't understand its function. WOT 4400 RPM's 85kpa and 22 degrees of advance according to the main timing table. ECT and IAT's were in check so they weren't screwing with my timing, I had 1.88 degrees being pulled but the Scanner still indicated 23.5 degrees of advance being present. My altitude sucks apparently. With a full airbox I drop to 85kpa (from 88) by 3700 RPM's and with air filter and airbox lid removed I don't hit 85kpa until 4900 RPM's, is that 1-2 kpa being lost over the RPM band significant? And what am I missing? Why is more timing being added?