Hi All, I'm hoping someone can help me with this question or point me in the right direction. There seems to be a disconnect between what I set my SA to in the main spark table and what I'm actually data logging. I've looked at some of the modifier tables and they all seem to be adding spark. But for some reason I'm seeing close to 10's less spark in the data log than I have in my tables. Is this a data log issue or is something else lowering the SA?
Thanks for any help or suggestions.
10 degrees is about what most old gm calibrations subtract for a knock sensor failure. do you have a knock sensor failure?
failing that it must be an ADX issue or something
Not that I'm aware of. It's a band new sensor, I'm not getting any codes and I get occasional Knock detected. I do have all the EGR stuff turned off for purposes of data logging not sure if that could affect it.Originally Posted by steveo
Does the logged advance match a timing light? Is it times at zero without computer control timing?
No need to re-invent the wheel. But we can make it better
It's pretty close up to 10's which is as high as the markings go on timing marker.
for the hell of it run the factory cal to see if you broke something
It does not like the factory cal much now that it's got the new cam and heads. I'm thinking it might be the "Main Spark Bias" or "Coolant spark Bias" which are both set to 9.8'. When I have some more time to mess with it I might try and set those to 0 and see if that makes a difference.
If I remember correctly the bias is a computation from other adders and if you zero them they won't compute. When I tried setting them to zero it didn't work for me. I'd look at altitude and octane retard. I think that's what they were called in $OD
No need to re-invent the wheel. But we can make it better
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