The more I read on di engines, they seem to be able to run a much leaner a/f ratio than non di engines. What's a safe lambda to tune these engines?
The more I read on di engines, they seem to be able to run a much leaner a/f ratio than non di engines. What's a safe lambda to tune these engines?
Are you talking N/A or forced induction?
I've seen a lot of dyno sheets for EB 3.5s running about 12:1 or 0.85 lambda (with the factory stoich at 14.08)
I run my LNF (GM's 2.0L GTDI) at 0.85 and others have gotten max power with that engine at 0.85 or even slightly leaner. I tested my SHO's engine at 0.79, 0.82, and 0.85 and found 0.85 to run very well without taxing the fuel system.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I'm not sure why posting the VIN number would matter, they are basically public knowledge to anyone. I could walk up to any vehicle on the street and write one down.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
You think they wouldn't be able to tell anyways?
I love how no one else even bothered to answer the OP's question.
I love lamp.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
You noticed too? I was told not to post my tune file, but I did anyway in hopes that the person telling me not to was wrong. I see now that my tune file has been downloaded 4 times with not one reply to help, as in this thread. Thank you Metroplex for your threads to help the community. Ive had to go back through them several times when I run into a issue.
Sorry, I looked in the OP of this thread for the logs and tunes and didn't realize that you just started a new thread with your logs and tune. As far as AFR, I personally am running ~0.825λ @ ~15 psi
Here is a link for everyone else. Thread: Review my log
2016 Ford Explorer Sport - 3.5L EcoBoost
2006 Ford F150 Lariat - 5.4L 3V (315,000 miles )
I'll have some time today to look at the files. When I tested my SHO, I didn't find any benefit to going to 0.76, 0.79, or 0.80 as it wouldn't really reduce knock retard. It would however, tax the fuel system (lower fuel pressure) at higher boost. I think it was dipping into the 1800 psi range or lower when I ran 0.79 at WOT with 18 psi. I'm running 0.85 lambda now with 18 psi and the pressure doesn't drop below 2000 psi at WOT and I didn't even touch the fuel pump settings.
I can't access the log/tune files right now, but what was your fuel pressure at WOT? Is it hovering near 2000-2300+ psi? I've seen other EcoBoost engines that would get the insufficient fuel flow limit error but their fuel pressure was still looking good. I know my SHO would throw that error with too rich of a lambda at WOT. My commanded WOT lambda is 0.85, but the actual lambda drops down to 0.80 at above 5000 RPM for some reason and I still haven't found a solution.