The end angle has a diminishing effect as the injector duty cycle reaches 90%, however, it's nice to tune this for best idle and lower RPM ranges. Here are two pictures of the DIS coil pack and my cam sync/oil pump drive:Ĭlick to expand.I'm no longer using a -45° injector end angle value. EFI simply makes this truck a pleasure to drive. Anyway, today I drove my Bronco on a nice long joy ride and it runs awesome! The power and driveability of my 508 BBF is just incredible. All my following upgrades (MPFI, crank trigger, DIS, sequential EFI, etc.), were minor improvements. Believe or not, the most significant engine improvement I've ever made since carburetion, was Holley's TBI system. My engine definitely seems to run a little smoother under sequential EFI control BUT nothing very significant. While I was at it, I made a nice adjustable spark plug wire hold-down to support the center span of wires (due to the missing distributor cap, rotor & adapter). So I converted the Hall-Effect sensor to a "cam sync" sensor (for sequential EFI operation), by removing seven of the shutter blades and fabricated a stainless steel plate to cap-off what was left of my distributor. I fabricated a custom stainless steel plate to mount the DIS coil pack but it's hardly noticeable in the picture.Īfter a successful test run with DIS, I decided, what remained of my Mallory Hall-Effect billet EFI distributor, needed to serve more purpose than just an oil pump drive. Holley's DIS kit outputs more spark energy than high-power single racing coils (for forced-induction, nitrous oxide or high compression engines). I liked the idea of getting rid of my CD ignition box, coil and distributor, so I upgraded to DIS (Distributorless Ignition System). As most of you know, I recently converted to multi-port fuel injection, then to a custom 60-2 crank trigger kit.
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