Quote:
Originally Posted by bo2o
-3% on all the low setting isnt reallie what you were driving.
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The ecu also makes correction for every time you make a correction to the SAFC. The only way to truly tell if there was any significant change to the A/Fr's would be to put it on the dyno, with a data logging wide banned. This way you can see if you are losing HP. If the engine is losing power with those lean settings then you are ineffectively decreasing MPG. Since for every rotation of the engine cranking, trhe vehicle moves that many inches or mm less from inertia and momentum that was used when the engine had more power. (The law of physics).
Or just get a wide band and determine the driving situation before and after SAFC..... But that could take a few trips on a few tanks of gas...