How much timing changes should i expect to see when logging timing for idle?
My commanded RPM is 850 after my Cam, Mag2650, NW 103tb, Big Gulp install in 17 ZL1. I see my RPM fluctuate 740-870 range and timing from appx 7 to 20 degrees. Some times when i am at a stop i feel the car shake as timing fluxs. Been trying to figure out a good fix for this. The original Tuner did adjust the Idle Torque tables by slightly bringing down the reserve and external load tables. From what i find on the net searching, some say add timing to the Base min spark table, some say remove TQ from the VTT. Others say add to the idle reserve table, others say remove. I feel like i am going in circles.
So, first question, what is a normal amount of timing fluctuation is to be expected? 5 degrees? 10 degrees?, 2 degrees? I have no idea!!
Being that i am already at positive timing, which table should i concentrate on ? MAF is already dialed in to appx 3% or less.
Any help would be great!