(X*4*Y)/1200
X= BPW and Y=Engine RPM.
TBI IDC (%) = [4 * IPW (ms) * RPM]/1200
Wrong calculation was started here in 2007:
http://www.fullsizechevy.com/forum/g...lse-width.html
Comes out correct to 1project2many TBI helper and all other math...
(X*4*Y)/1200
X= BPW and Y=Engine RPM.
TBI IDC (%) = [4 * IPW (ms) * RPM]/1200
Wrong calculation was started here in 2007:
http://www.fullsizechevy.com/forum/g...lse-width.html
Comes out correct to 1project2many TBI helper and all other math...
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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