I have a 96 z28 lt1 383 procharged. I finally finished the build and now want to tune it but have no idea where to start. I purchased tunercats/datamaster, I ran the car with datamaster recording and my car is running rich and also its saying my spark retard is 12.0 at an idle (which is a bad thing? considering its red?)

I changed my cylinder volume to 778.45 because of the 383.
But I dont know how to lean out my AFR or advance/retard my timing.

Can someone please teach me or help me better understand how to do this? Thanks!

 

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