Im pulling my hair out just trying to get a decent running tune for my turbo 4.8. here is the low down on my entire build.
Stock 4.8 bottom end with 317 6.0 heads (i know low compression) ls2 cam stock everything else
aluminum ebay intake (ls1 style)
76mm on3 turbo
80# siemens deka IV injectors
tuned on 0411 pcm
4l80e transmission
SD only custom os loaded and zeroed out maf fail frequency and maf hertz.
My issue is that no matter what i do i cannot adjust my idle AFR's. it sits at 11 afr on my wideband literally no matter what i do. Ive zeroed out my base idle airflow, messed with minimum pulsewidth zero'ed out the VE table in the idle cells just about everything to get a leaner idle and nothing seems to affect it at all. It runs incredibly rich on cold start and windmills on startups for about 10 seconds sometimes seemingly at random. At idle im seeing about 19in of vac which seems low to me. And it idles extremely rough, almost like i have a miss but i cannot find a single issue with either the ignition system or fuel system. Turning the injectors off one by one shows that all cylinders are in fact hitting. Ive disabled adaptive idle, integral and proportional idle adjustments as they seem to make the idle eventually richer and richer until the engine stalls.
Here is the injector data i was given with my injectors, i cannot make anything out of it. And ive included my latest tune. Please help me lol.