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Originally Posted by jamesm
^ he's right. calling it 'autotune' to begin with is misleading. it's not tuning anything. it's trying to save it's own life. it cares nothing for optimization.
one could argue that fuel trims are fine because once they stabilize the AFR is fine. it's simply not true, especially on this car with it's two completely independent, interoperating fueling systems (port and di).
just look at some of the guys running OFT on e85. sure their trims 'learned' over time, but they still have wildly variable AFR every time the go into open loop. i've seen logs of the OTS e85 map with guys running 10.x:1 on e85. certainly not a good way to make power.
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Thank nelsmar for telling me about things like this.
ECU autotrimming (better than "autotune"?) is good for tuning on this car b/c it IS a safety net that allows a tuner to make a bit of a mistake, see the system correcting to save itself, and then he can correct for it on subsequent runs without damaging the engine. But using it like a crutch is a good way to not make power correctly, or even lose power, or to make sure any "gains" seen on the dyno simply don't last very long as the ecu pulls timing out again.