Quote:
Originally Posted by ZDan
I perhaps mistakenly thought '17+ is closed loop even at WOT, all the way to redline. I dyno'd it soon after I got it and both the dyno operator and myself had never seen dead-nuts on A/F, solid flat line just below 13:1, all the way up, identical for 3 pulls.
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For clarification, it definitely does run in open loop at WOT, but there are STFT and AFR corrections that happen real-time.
You can see that in action here:
https://datazap.me/u/goingnowherefas...24-25-30-33-34
That is a 3rd gear pull ECUTEK datalog with a 17+ BRZ. As you can see, AF correction is a loggable parameter, but in this case it is doing nothing while STFT increases to ~10% after the initial AFR delta upon tip-in.