[DaveR_GT]

When you say tuning... what is there that can be adjusted that the computer doesn't already control?

I know timing can be tweaked, spark plugs, fuel pressure, fmu, tps voltage are about the only things I can think of that can be adjusted. Beyond that does the definition of tuning involve custom chip or programable computer? changing injectors/mass air? Where do you draw the line between tuning and what are considered modifications? And how much real tuning can be done with the stock computer? It's not like the carb days where I could swap jets, make air fuel adjustments and timing curves by swapping a few simple parts or turning a few screws.

When someone mentions tuning on an injected car I often wonder what really can be done?

(please forgive the ignorance, I've had a few mustangs but this is the first time I've really gotten serious about modifying one)

Later