Quote:
Originally Posted by steve99
BRZ 86 FRS ECU Information - ECU Type Flashing Learning Resetting
Fuel Trim Learning
To speed up learning of fuel trims you will need to drive smoothly. The ECU only learns fuel trims in “Closed loop “ mode this is during slow or steady throttle movements and cruise and idle. When your driving aggressively on/off throttle and wide open throttle the ECU is in “open loop” fueling mode and does not learn fuel trims, it just applies the fuel trims learned in “closed loop” fueling mode. If the ECU has not had enough learning time in closed loop it will apply incorrect fuel trims and car may feel sluggish or hesitant till it learns.
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how much time/km do you think it could take before he learn correct fuel trims?
and also, if he apply an incorrect fuel trims while in open loop, could it cause knock?