Ignition/Tuner/ECM/Fuel InjectionNeed advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.
Since I haven't been able to find someone who has the ECM timing maps from a Stage One MoCo flash, I began wondering if there is any way to extract that data from my ECM.
My PCIii let's me adjust spark timing, but I'd sure like to know what I'm adjusting from. Once I get this back from my tuner after break-in, I'd like to know what my actual timing is.
Damn Ed, didn't know anyone else still had those. Seems like for ever ago we did those.
Now if only the PCIII was designed to adjust timing at the same throttle position & RPM points as the native ECM tables, then my quest for certainty would be closer to fulfillment, but noooooo.
The more I learn, the more I dislike piggyback systems.
have you promoted you igntion tables to advanced, IIRC when everything is set up right you can get to make an adjustment every 250 rpm. I'll double check that here in a sec.
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Now if only the PCIII was designed to adjust timing at the same throttle position & RPM points as the native ECM tables, then my quest for certainty would be closer to fulfillment, but noooooo.
The more I learn, the more I dislike piggyback systems.
That's always been the issue with any piggyback! The more you learn, the less you find out it really does. Your only altering the system in one condition, what I mean is if you remove 5 degree's its gone, cold to hot and everywhere in-between, when the ECM is changing the timing for all those various conditions, so its never the same cold as it is luke-warm or Hot.
One other thing to be careful with on a MM ECU system is the Throttle table for spark and fuel is in degree's rotation NOT Throttle Percent as the DJ unit is. That is why you only see close to 90 dergree shown in Ed's table.
Last edited by Steve Cole; 10-21-2018 at 07:43 PM.