Wheelz
May 10th, 2013, 09:33 AM
Took a road trip this week pulling a light cargo trailer. Figured I'd take a couple logs and try to get an idea of what my trucks doing. Now I'm more confused :eek:
(sorry for the long log file)
So if I make a custom Map in the scan tool to look at my commanded spark (gm.dyncylair vs rpm, plotting avg values), I don't understand why its commanding what it is. It seems reasonable on the left hand side of my data when looking at the map plotting avg cell values, but as air/cyl increases so does the discrepancy between logged and the tune; to the point that the 0.6 gram/cyl column has more timing than the high octane table commands, and I filled up with ethanol free 87 octane :ermm: I also had an incredible amount of knock detection in my opinion when I was cruising in O/D. Can someone point me in the right direction to help me understand how timing is calculated? I believe I was running in P/E mode based on MAP PSI, which is what I was blaming for the knock while I was driving, till I saw how high my timing was compared to the base tables.
I don't have my LC-1 installed yet to have any WB02 data :wallbash: Truck has 91k mi and is all stock.
My tune is 99.9% stock to my knowledge as far as fueling and spark goes. I've mainly been changing shift points, torque limiters, and added a little throttle at idle cause it was stumbling on occasion when I stopped in gear. Updated to the newest software and firmware the day before the trip.
Thanks in advance
1502515026
(sorry for the long log file)
So if I make a custom Map in the scan tool to look at my commanded spark (gm.dyncylair vs rpm, plotting avg values), I don't understand why its commanding what it is. It seems reasonable on the left hand side of my data when looking at the map plotting avg cell values, but as air/cyl increases so does the discrepancy between logged and the tune; to the point that the 0.6 gram/cyl column has more timing than the high octane table commands, and I filled up with ethanol free 87 octane :ermm: I also had an incredible amount of knock detection in my opinion when I was cruising in O/D. Can someone point me in the right direction to help me understand how timing is calculated? I believe I was running in P/E mode based on MAP PSI, which is what I was blaming for the knock while I was driving, till I saw how high my timing was compared to the base tables.
I don't have my LC-1 installed yet to have any WB02 data :wallbash: Truck has 91k mi and is all stock.
My tune is 99.9% stock to my knowledge as far as fueling and spark goes. I've mainly been changing shift points, torque limiters, and added a little throttle at idle cause it was stumbling on occasion when I stopped in gear. Updated to the newest software and firmware the day before the trip.
Thanks in advance
1502515026