Some claim spark table differences when the acceleration time is longer (IE on the a heavy truck) but I don't think that is an overwhelming factor based on all my experience with cars, heavy cars, trucks, drag racing, road racing, and a loaded dyno. I don't run stuff on the ragged edge either, though, IE a blown stock SOHC has no business running 20* of timing on pump gas.
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Justin Starkey Justin@VMPTuning.com VMP Tuning
2007 Shelby GT500 2.3L TVS 748RWHP/722RWTQ
VMP Dyno-Tune, VMP 2.65" Upper, VMP 72MM TB & Big Inlet Plenum/Elbow, VMP 115MM MAF, IW 10% OD balancer, 80s, Dynatech 1 7/8" LTs with 3" X pipe, stock catback
Old Time: 11.0 @ 130MPH 1.9 60ft on 18" DRs
2006 Mustang 4.0L with Vortech @ 15psi
2006 Jeep GC SRT8 6.1L AWD
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