I'm getting ready to dive into throttle-body efi on my 455, anybody have any fuel and/or ignition maps they'd like to share? I'll be using the Holley Projection 4Di, any ideas on a base map to begin with? I've searched, but can only come up with maps for Fords or Chevy, and not nearly as many as I'd thought there would be.
When it comes to a starting point, you're never gonna get your exact combo. Best you can hope for is something with similar engine size. In fact anything within about 40 cubic inches is probably fine for starters. Is that a speed-density system? -Bob C.
Yes, speed-density same as the earlier ProJections. I'm pretty comfortable with the ideas behind tuning the fuel, but I haven't found much at all regarding the ignition tables. Ideas?
Basically, you want to start with around 12 - 15 degrees at idle, 34 at WOT, 45 for highway cruising, and just kinda interpolate in between. You may have to tweak those later. -BC