Originally Posted by
steveo
by 'numbers' do you mean knock count or knock retard? what ecm are you tuning, and what engine?
if you're monitoring for knock counts, you're generally tuning heavy loaded throttle (in the 80kpa+ range). you need to drive in a variety of conditions to tune timing to the limit.
you generally wont get useful knock information at light throttle cruising range, a lightly loaded engine is really hard to get knock from. you're shooting for 'smooth and efficient' which generally is the point of greatest vacuum but no further, but also is by feel.
if removing a decent amount of timing in an area doesn't remove the knock counts, it's probably false knock. false knock can be engine harmonics that your knock filter isn't equipped to deal with... valvetrain noise, exhaust tapping against the frame, cam drive noise, whatever. if false knock only exists in a single area, some ecms let you disable knock retard in that area.
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