Changes by last author:
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Primary trigger input setup * input DC voltage measured with input open ? * input DC voltage measured with input pulled to ground with 1kOhm resistor ? * ECU serialnr ? * can you temporarily place a magnet on a crankwheel and use a HALL sensor as reference, confirm with scope ? ** it's sometimes difficult to make a proper permanent sensor mount but perhaps not very demanding to temporarily mount for verification in the garage ---- Ign output setup Coils ?? ... ---- |
| When setting up ignition to 17 degrees BTDC at 1000 rpm its only 7 degrees at 5-6000 rpm so its sliding almost 10 degrees. Measured how ? |
| When setting up ignition to 17 degrees BTDC at 1000 RPM, its only 7 degrees at 5-6000 rpm so its sliding almost 10 degrees. Measured how ? |
| ** wrong edge ? |
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** capacitance on input causes appr 278 usec delay on input ? - this can cause the said delay at higher RPM. Can you try the primary trigger falling edge ? Can you scope the input signal ? If this is the case, you can decide to shape input signal properly, or if it's perfectly reproducible, just compensate
** wrong edge of output ? No, that would be too MUCH sparkadvance at higher RPM |
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We scoped on bench, ignition is exactly as shown, no "sliding" at higher RPM. Write (above) about coils, check carefully that * coils fire on the edge when output is deactivated (after dwell), not automatically earlier (eg internal current-limit ??) * that strobelight measures actual spark (not the dwellstart ~ activation of ign output) and that * strobelight does not have some special compensation (it actually lights up exactly at spark, no compensation) * is the input not sharp enough ? Fill in above |