Alright I have a 94 K1500 suburban with a 16186935 computer. Im using tunercat. From my understanding the main spark bias is going to be whatver I set my base timing at (10* in my case). So my question is does the computer include that in the timing or does it add all the timing in on top of that. For example say its supposed to have 30* and I have the main spark bias set to 10* does the computer only add in 20 for the total of 30 or does it add in 30 on top of the 10 for a total of 40. I hope you guys understand what Im trying to say. Thanks

Josh

 

I believe you are referring to the Initial Spark Advance setting in TC. The main spark bias is something different, and whatever it's set to, tunercat compensates in the main timing table. So what you see in your main timing table is what you get (plus the adders, minus the initial spark advance).

 

You are correct I goofed. I changed the initial to what I set base at so. Thanks for the help though. Im the newbie so if I ask some kinda dumb questions please bare with me and thanks for the help.

Josh