My Demon 5.7 hemi carb swap
KX450 - I've asked around and the general consensus is that your MAP should "flat line" at 11 PSIa (7.53 Hg") - not go under the line.
By plotting it under the line - it is retarding your RPM advance at WOT when intake pressure is highest (Vac is lowest).
Why MSD would "sell" this as a tune is beyond me!
The way I understand it - as Intake pressure increases (PSIa).....Vacuum drops ("Hg)
- but as Swifter pointed out - your timing is being retarded after Intake pressure peaks at 11 PSIa (Intake Vac drops below 7.53 Hg")
