** => impossible to tune good idle with 0.5msec injector pulsewidth

** while identical engine works well with lowZ-active flyback but PWM-ing disabled => would work well with 30V flyback.

For faster injector closing, convert to 30V flyback by installing [30V unidir transient diode] in the harness:

* Make sure injector PWM-ing is disabled (100% duty, after time 25.5msec)

* retune. Longer injector pulsewidth will be needed (so better VE precision unless quickly hacking some large injopen values)

** really retune carefully: even if higher power loadsites were tuned, pushing it without retuning would cause lean operation, knocking, and likely damage

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Thanks, i am sure about retune after install transient diode.

When i want to install diode inside, is this the good way?