i just recently started looking into burning proms. i have a tbi and my friend has a tpi. we are interested in learning how and i did a search and found a few examples of spreadsheets for tpi but i did not see any for tbi. i have an lt1 cam and i am in desperate need of leaning out the idle alot!!! can any one point me in the right "search" direcection...

 

decrease your VE table in the 1000rpm and undr range by 10%. Or just by installing a vacumm reference fuel regulator, you could probably get your chip to match that cam nicely.