I am getting ready to start tuning a 01' C5 with a 346 twin turbo motor. Today I loaded a new custom OS and a stock bin file into the PCM. Tonight I "built" the tune per the tutorial as well as normal adjustments for a modified motor and saved it as a base file.

My question is regards to the fueling. On a non custom OS NA setup once the VE tables is dialed in, you can use the PE modifier by rpm to control WOT fueling. Right?

When tuning with the new OS does that that parameter have any control? It seems like the tutorial refers to the {B3647} Open loop AFR as the sole control of power enrichment fueling.

If I understand it correctly; it seems as if the tutorial takes away most the of the PCM's ability to interfere with a SD tune. Most of my tuning experience has been with systems like GEN7 and FAST where everything is what it is!

Can someone please elaborate a bit on the fueling procedures?

Thanks

Howard