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I just started running EFI.. but I MIGHT have to make a fuel table just for racing... in open loop its
trying to drive the A/F to stoichiometric all the time
and in a max power condition you want somewhere in
the 12.5 range... so just for racing I might have to
with a fuel table... it can be way more consistent
if you stay in open loop and let the O2 do the work..
I'll tell you come spring time which way I go on
the loop thing
You definitely want to stay in closed loop with a target A/F ratio in the mid 12s, but you also want a base fuel table that doesn't require that closed loop does all the work. You want the base fuel table to be close to ideal. This is because the closed loop correction is always "behind the curve" because it only sees what has already happened. You don't want to run a race engine lean at any time.
do the aftermarket efi ecu's control fuel like the oem's do with short term and long term fuel trims??? If so then it can calculate fuel trims from engine load, map and/or maf, ect and tps position.
short term is real time fuel trim and long term is the correction table to correct the short term. The computer can actually figure out a long term fuel trim at a given engine load and tps position to compenste for "future table corrections" if that makes sense. I would assume a self learning efi system in closed loop would do the same??
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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