Seems I?m tuning engine swaps lately.
This LS3 is in a 59 Apache panel truck.
Auto trans with a stall and separate controller.
Car was dyno tuned by another shop, so I don?t have the orig tune file. Can?t seem to find the LS3/480 tune in the repository. So if someone has one, or knows where it might be in the repository, I?d appreciate it.
Commanded idle is 875. And it does idle there. I am just trying to tame it a bit.
Using the VCM controls, I told it to idle at 700. Desired idle complies and shows 696 rpm.
The engine remains at approx 900.
Timing doesn?t change, neither does the tps. Tps desired however does drop.
I can speed it up, that works fine.
The VCM controls also let us manipulate the throttle through its range with the engine off. Although the tps won?t go to 0, it will go to 12%.
When I tell it to idle at 700 from 900, the tps sits at 20%.
So something is limiting the tps from going lower.
I lowered the final airflow min table but no change there.
Ideas?
I?d like to tune the MAF below 900 rpm, just can?t get there.
BTW, it?s MAF only and my research says GM set these up that way.
Ron