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Bond,
The ECU goes closed loop running on the O2 sensor from approx 1200 rpm to 2100rpm, after the system goes open loop the DFAS has a much greater effect.
This richening of the mixture seems counterintuitive but it has meant much lower throttle usage, better responce and a drop in fuel consumption.
The AFRs have dropped from 14.7 to 13.0 if you look at the graph closely. This fuel economy has now been confirmed over 5 tanks of fuel.
I contacted the ECU talk bulider and he advised the changes it could make to AFRs would only be tempoary whilst the unit was attached and displaying.
The DFAS unit only adjusts at 128 loadpoints not specific RPMs so needs to be setup on a Dyno with a good operator.
I hope this answers some of your questions.
Regards
BJNSW
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