It's always fun to talk about upgrading a fuel injection system. Typically, upgrading to a newer fuel injection system is better. Typically, upgrading to newer fuel injection system is more expensive. More often than not, gearhead-efi members upgrade fuel injection systems with a very limited budget.

Cost vs. Performance

OBD1 (1987 - 1995) is affordable and provides good performance.
OBD2 (1996 & newer) is less affordable, and usually performs better than OBD1.

The injector batch firing sequence for TPI is 1,3,5,7 and 2,4,6,8, ... that's a sun rise in the East and sun set in the West statement ... Meaning that is just the way it is.

MPFI - could mean Multi Point Fuel Injector, or could mean Multi Port Fuel Injection. When I see MPFI I think "One Injector Per Cylinder".

Years ago, Edelbrock offered a TBI to MPFI conversion fuel injection system. The system included a new intake manifold with 8 injectors "One Injector Per Engine Cylinder", custom chip, and a 8 injector pigtail to replace the TBI injector Connectors. It was a good system, that worked well for stock engines or engines modified with the "Edelbrock Camshaft Package". The Eledrock system did not "UPGRADE" the computer electronics for optimal injector firing. Link to the Edelbrock TBI to MPFI installation manual: https://static.summitracing.com/glob...multi-poin.pdf

The .pdf file posted above is a "How to OPTIMIZE" the 16168625 injector firing for MPFI - One Injector Per Cylinder.

Converting the 16168625 to MPFI has been very successful and a budget friendly upgrade for several gearhead-efi members.

dave w