Apexi SAFC base maps
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a stock t2 ecu has "zones" there is an idle zone, the "feedback" zone, where its running 14.7:1 from the o2 sensor. there is a like a medium load and a WOT, among a couple of other deceleration ones.
the feedback zone is basically from 1100-3500rpm but only up to a certain load, say 0psi. in this zone the ecu is looking at the o2 sensor, and running 14:7:1, basically for emissions and fuel economy.
over 3500 rpm and under 0psi, its in a medium load zone, afr drops into the low 13's mid 12's, depending
@WOT, which is anything over 80%, or maybe 1psi +, the ecu is in the high load zone, afr drops for safety into the 11's, and toward the redline will probably get to the 10's. under high load, extra fuel is added for cooling, knock resistance etc etc.
essentially with a stock ecu setup, the ecu does NOT know that you've increased airflow at all. so if you increase power by 25% then you need to increase fuel by about the same amount, and then use the SAFC to make any fine corrections.
since the ecu does NOT know its making more power, the saftey not blowing the engine part is up to you, so you have to make sure that everything is doing what its supposed to and you aren't too lean.
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24seven_dada
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11-10-18 12:03 PM