Quote:
Originally Posted by cockerpunk
the best question is why don't we have a plug and play megasquirt option for 944/951 yet?
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The major problem is re-using the factory speed/reference sensors. Due to the large number of signals per revolution, and the wide-range of output-voltages, it prevents a lot of aftermarket systems from working out of the box.
1. One problem is the larger number of teeth per revolution compared to a more standard 60-2 wheel. This requires faster processing to count all those teeth.
2. The other issue is having a separate TDC-reference signal that's not part of the timing-wheel. This requires a 2nd AD-converter and extra circuitry and programming.
3. Yet another issue is the voltage-ranges of the speed/ref sensor is wider than other systems. Above 5000rpms, the voltage-output is higher than the range accepted by AD-converters used in most EFI systems. They go blind and sees that the engine has stopped turning.
4. And getting the AMP male plug for the EFI box to plug into the harness is difficult or very expensive.