my stock tables maxed out at 335 in certain areas. i raised them about 4% and smoothed in the 16-2200 range from .40 to .60
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my stock tables maxed out at 335 in certain areas. i raised them about 4% and smoothed in the 16-2200 range from .40 to .60
Looks like i missed that there were more posts here.. I thought i had this pretty well sorted, then switched to straight 91 from e85 since gas is so cheap.. and back to playing with it. Also going to dump in some octane booster just to rule out that any real KR.
What is interesting is the 2016 SOI is a bit different from the 2018 in the area we are talking, and also at lighter loads in the RPM range.
I wonder why? Curious how it impacts fuel economy, emissions, etc. From what I understand and from practical knowledge, too early and you wet the piston and too late you have a bad mixture. Not sure if later is better for emissions, only assuming as years progress GM tweaks for this reason. I am not sure if there were other design changes that may demand this. The area we are looking drops off quickly. I see areas stock in the 240 range. It ramps up to a certain load, then tanks, then ramps up.
Trying to understand the logic and benefits of one way vs. the other and why GM would command later vs. earlier.
When I look at most of GM's tables, like this, I see modeling that populated the tables. The thing I often wonder is should there be drastic changes between cells? I highly doubt jumping one cell justifies a change in SOI of 20-30 deg.
Attachment 99514
GM also made a change in the high-pressure tables as well and it appears to be at the same cruse area have a look at this form. https://www.silveradosierra.com/ecot...3-t657369.html
Cool, thanks. Any idea what tables they are talking about? Trying to read through the thread now...
Fuel system - fuel pressure - high pressure desired - base. And also the soi table you mentioned. I haven't made any changes to my 14 Sierra but it's having the same knock issues while cruising. not sure if that's GM's way of trying to fix it.