Originally posted by dr_bowtie
once you understand how it works...it's easy....the basic...more vacuum at the map sensor the leaner the fuel ratio.... the less...the richer...how you bleed off the vacuum...is your trick..
belive me i know how it works, it a lot of ways to richen a EFI but creating a vac. leak at the map senser ant one of them. the only time you would need the extra fuel would be at WOT and you dont have any vac. then anyway.