I am trying to compile common tune changes that have become a standard for Gen V with a few common mods. At the same time I am just learning from my research and testing some theories to get my tune dialed in. Here is what I have so far. Please help add and let me know if you see something is a miss.
Big thanks, in no exact order goes out to ghuggins, smokeshow, Higgs Boson, Ben Charles, 5FDP, kevin87turbot, TriPinTaz, lt1z350, cadillactech, cmitchell17 and many others that I am forgetting to mention here. Reading through your posts and/or direct help is how I came up with this list.
Specs
2017 Silverado E92A L86 8L90 3.42gears only tuning ECM (TCM still locked and stock converter)
Cam: BTR Stage 2 - 210/223, .540"/.540", 111 LSA, 14% fuel lobe (stock springs, push rods, rockers, 20deg limiter)
Speed Engineering 1-7/8 long tubes with catless Y pipe (stock muffler)
Hone on stock bore, new Speed pro stock replacement pistons and GM rings
194deg thermostat - was motorad thermostat but started opening very late after 2 months, allowed up to 250degF. Using Murry now but may actually be same company...
Common Issues after a cam install
surging idle - virtual torque and airflow calibration are the two main places to address this.
negative spark at idle - virtual torque model and possibly VVE needing adjustments.
excessive fuel trims at idle - goes back to both the above.
Base Tune
Changes made for cam
Engine>Idle>RPM - added 200 to Base, Rolling, P/N, In Gear (may lower a little when tuning). update: 700-750 recommended idle for this cam.
Engine>Idle>Torque>Limit Offset - bump up around 20% to give bigger window to get it running
Engine>Idle>Torque>External Load - many areas need lowered some, the main idle areas may need cut down to ~25% of original value
Engine>Airflow>General>Cranking Base Airflow - subtract 2
Engine>Airflow>General>Cranking VE Primary - set to 80% for now to get it started easier
Engine>Fuel>Lean/Fuel-Saving - disabled DOD
Fuel System>Fuel Pump>Injection Refill - scaled y axis for edge angle for 14% fuel lobe on cam
Virtual Torque - lowered torque numbers by 40 around idle and smoothed out transition
Engine>Airflow>Variable Camshaft - zero them out for base tune. Tune with set degrees later to dial in VVE and VT tables
Changes made for no cats
Engine>Exhaust>Catalyst - high number in min ECT and low number in max ECT to disable catalyst warmup
Engine>Fuel>General - disabled split pulse crank
Engine>Fuel>Temperature Control - disable Catalyst Protection
DTC's to disable - P0036,37,38,54,56,57,58,60,137,138,13A,13B,13C,13D ,13E,13F,141,14A,14B,157,158,161,420,430,2096,2097 ,2098,2099,2270,2271,2272,2273
Changes made for long tube headers
Engine>Fuel>Oxygen Sensors>Integral Delay>Airflow Mode - bump up 20% for O2 sensors moving downstream a little
Engine>Fuel>Oxygen Sensors>Proportional>Airflow Mode reduce 10%
Engine>Fuel>Oxygen Sensors>Proportional>Limit change to 1.25
Engine>Spark>Knock Sensors - upped cyl number threshold multipliers
Changes made for 194deg thermostat
-Fan systems>Fans>Mechanical thermostat set to 194 (was already set there even though I read stock thermostat is 207...)
-Fan systems>Fans>Control by ECT>Desired ECT - was set for 195 and 222, changed the 222's to 200
-Fan systems>Fans>Control by %>Desired % - bumped up fans speeds to come up sooner.
General Changes to help with tuning
Engine>Fuel>Oxygen Sensors>LTFT Idle Cells Thresholds>Enable VSS=255, Disable VSS=256. This will help with fuel trim issue when entering DFCO.
disable flex fuel if virtual so it will not throw calibration off during tune
disable LTFT's
Tune from log results
I read that cold air intakes will pretty well require MAF calibration
calibrate MAF and VVE - Popular method for MAF+GMVE and suggests Steady state filters https://forum.hptuners.com/showthrea...ation-for-gen4
Spark advance
Virtual Torque - log delivered torque on a MAP graph and on a Airmass graph side by side. Now review log and see what cells correspond. Shift and adjust VT table to match.
Engine>Idle>RPM>Adaptive Idle>Speed Control>Immediate and Predicated - may need some fine tuning to not over correct or under correct
Engine>Idle>Torque>Adaptive Idle>Idle Torque Limit>External load - log zero pedal torque into this table
VVT limiter - command 25deg advance to verify how far it can go (only if you installed correct limiter to prevent over travel!). Now you also know max travel for tune.
VVT effect on virtual torque and VVE - I am not to this step yet, but set a constant valve timing degree and use logs to tune VVE and virtual torque tables at that degree.
Engine>Airflow>Variable Camshaft - fine tune angle table and the WOT angle.
Unsure about these
?Engine Diagnostics>Misfire>Cylinder Mode and SCD Mode - need to adjust for cam, maybe raise all 10% or just idle areas?
?Tune with EVAP unhooked - I have trouble getting a consistent calibration with EVAP hooked up...
?Fuel>General>SOI Base - I see some say to lower to a given number, others matching to cam event, others raising. So not sure...
?Engine>Idle>Torque>Speed Control Reserve - I read cutting this in half will help with transmission clunk when slowing down and then speeding up.
?TCM tune - probably would help to raise shifts and such to match cam but not planned at this time with the cost of unlock and license. Will if needed though.
?watchout for rich decel messing with fuel trim logs - best I could do was try to filter it out in charts and driving.