I have some slight pinging under load going 60-90mpg with a hard rollon. Not super hard but roll on to pass a car/truck/bike. As the engine "catches up" the pings get lighter and lighter. I'm ASSUMING I have a bit too much timing in the roll on area or not enough Acell Enrichment. Gas mileage is good at about 40mpg highway, 32ish around the hills of Pittsburgh. Plugs look pretty good as well.(i know i know with the cleaner gases etc..... )

Can someone help me and tell me in what area to take out the timing and how much?

This roll on ping happens from about 2500-4000 (I quit twisting after 4000 because the ping gets louder)

Here is the timing on the front cylinder. Left axes is 750rpm to 6000 rpm. Top axes is 15-20-30-40-etc to 100 MAP (kPa)

18.00 18.00 18.00 18.00 13.00 9.50 5.50 1.00 1.00 1.00
18.00 18.00 18.00 18.00 14.50 9.50 4.50 3.00 3.00 1.00
18.00 18.00 18.00 18.00 14.00 10.50 6.00 4.00 4.00 1.00
24.00 24.00 18.00 18.00 15.00 12.00 7.00 6.00 7.50 6.00
30.00 30.00 19.50 19.00 18.50 16.50 13.50 12.00 13.00 10.00
45.00 45.00 23.00 22.50 22.00 20.00 17.00 14.50 14.00 12.00
45.00 45.00 27.00 26.50 25.50 23.50 20.00 17.50 17.50 15.00
45.00 45.00 31.50 30.50 29.00 27.00 24.00 22.00 21.00 19.00
45.00 45.00 36.00 35.00 34.00 32.00 28.00 22.50 22.50 19.50
45.00 45.00 40.00 40.00 39.00 37.00 32.50 26.00 25.00 21.00
45.00 45.00 44.00 44.00 43.00 40.00 35.50 28.00 26.50 23.00
45.00 45.00 45.00 45.00 45.00 43.00 38.00 30.50 28.50 24.50
45.00 45.00 45.00 45.00 45.00 43.00 38.50 32.00 31.00 27.00
45.00 45.00 45.00 45.00 45.00 43.00 40.00 33.50 32.00 27.00
45.00 45.00 45.00 45.00 45.00 43.00 40.00 35.00 31.50 28.00
45.00 45.00 45.00 45.00 45.00 42.00 39.00 36.00 31.00 28.00
45.00 45.00 45.00 45.00 45.00 42.00 39.00 37.00 33.00 30.00

 

Run a data log and it will show where your pinging, back up a couple of frames and remove half the amont of timing that your knock sensors have removed.