What range of AFR is really used in a common EFI engine I'd think 15.5:1 to 11.5:1 would have to cover the practical limit, yes-no?.. For conventional engines. Bruce ---------------------------------------------------------------------------- To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes) in the body of a message (not the subject) to majordomo@lists.diy-efi.org