Okay, let me start out with this: I only know enough about tuning to be dangerous. I am not a professional tuner.
Vehicle: 07 Tahoe
PCM: E38
Motor:
427CI short block
Comp 289/293 113
P&P 317 Heads
MSD coils
FAST LSXRT 102 Intake
DW 72# injectors w/ DW400 pump
NW 102 TB
4" intake pipe
LS7 MAF
1 7/8" x 3" primary long tubes
no cats, no rear 02's
Issue:
I started working the tune for all of the constant values that I know of to try to get in the ball park, and I cant get it to start and stay running.
These are the values I've set in the tune so far:
Cylinder Volume; ETC Scalar; MAF/IAT Cal (with repository LS7); Manifold Volume, Injector Flow rate/Min Pulse/Short Pulse Adder/Offset vs IGN (had to be scaled due to flow limits) according to DW flow data; LS7 spark tables; and did the typical COTS/DOD/DFCO/Torque Management/MIL disables.
Once all those were changed, I wrote to the vehicle and started trying to get the startup and idle using the Startup Airflow, Airflow Final Min, and Cranking FA adjusting them up and down significant amounts to see the difference. I got them to where they seem to start the engine but the RPMs take off to about 1500-2000 and it shuts off immediately. Any help would be appreciated.
Tahoe LS7 working.hpt