04-01-2009, 12:30 AM
hmm 1989...the first year I'm thinking for efi on the 460. These EFI's were of the Speed Density type, not the Mass Air like mustangs and 96 302 broncos. What this means is that it is gonna be a little harder to make power adders work for ya.
Speed Density computers have a preset table of fueling/spark depending on engine rpm and a few sensors. The computer knows the amount of air and fuel needed based on engine rpm and the stock engine geometry (throttle body, intake, cam, valve/heads, etc). Once you change this enough you really need to have a chip programmed to a new set of fueling/spark tables based on your mods.
The best way to do major mods and still maintain the efi is to convert to a later model mass air style system. This system measures the amount of fuel based on the airflow through a mass air sensor. Any changes like chargers, heads, cam, etc will be measured by the computer and adjusted. Granted there are other limitations like injectors, fine tuning, etc.
I've toyed with the idea of converting the 351 in my 91 over to mass air. My only hold back is the E4OD tranny that is controlled by the computer also. Requires a little more work. Maybe one of these days.
Now ya see why it is so tempting to jerk out everything and slap on a 4bbl and intake :doh:
Speed Density computers have a preset table of fueling/spark depending on engine rpm and a few sensors. The computer knows the amount of air and fuel needed based on engine rpm and the stock engine geometry (throttle body, intake, cam, valve/heads, etc). Once you change this enough you really need to have a chip programmed to a new set of fueling/spark tables based on your mods.
The best way to do major mods and still maintain the efi is to convert to a later model mass air style system. This system measures the amount of fuel based on the airflow through a mass air sensor. Any changes like chargers, heads, cam, etc will be measured by the computer and adjusted. Granted there are other limitations like injectors, fine tuning, etc.
I've toyed with the idea of converting the 351 in my 91 over to mass air. My only hold back is the E4OD tranny that is controlled by the computer also. Requires a little more work. Maybe one of these days.
Now ya see why it is so tempting to jerk out everything and slap on a 4bbl and intake :doh:
'70 uncut, '74 ranger uncut, '78 custom, and '91 eddie bauer
I'll keep my freedom, my guns, my money...you can keep the change.:thefinger:
I'll keep my freedom, my guns, my money...you can keep the change.:thefinger: