I want to be sure I understand WOT ignition and what was tuned on dyno. Before dyno tuning at 5500RPM 100% load you had 35 deg but after tuning you found 27 deg provide best torque? If so that would mean you had far to much ignition at high RPM prior to tuning?
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Originally Posted by dannichols1474
Hi Ben,
In the last post I said I thought a dyno session is good value for the money, then I reread your post and I want to add that if you are using the ECU to control the fuel injection only, then tuning the EFI with the big hills/foot on the brake technique is adequate if you are happy with your results.
I bought Al Kosmal / X-Faktory's Option#2 conversion package that added ECU ignition control to the ECU fuel injection control, so dyno tuning made sense for me to optimize the timing settings.
Here is a photo of the ignition table before dyno tuning using timing values from the characterization of the distributor mechanical advance curve before I started the CIS to ITB EFI conversion project:
Here is a photo of the ignition table after dyno tuning using timing values derived from timing sweeps to determine MBT (max brake torque) at various combinations of rpm and load:
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