Originally Posted by Supercharged5.0
Ok so I have a 1990 5.0 with a powerdine supercharger on 9psi, cold air kit, and flowmaster exuast, and I was wondering what intake and what size injectors to put in it.
A ported Cobra or a Holley Systemax intake showed the best results in a recent dyno test I read about. Surprisingly the ported Cobra was really close to the Systemax in overall power.
I wouldn't go any smaller than a 36-42 lb injector.
You will need a MAF tuned for the injector size you choose and you will probably need to have the ECU chipped and dyno tuned or purchase a piggyback tuner like the AFM PMS to tune your engine with.
You might get by with a smaller injector and an FMU, but that's not an ideal way to tune your fuel flow and it could lead to leaning out your engine and burning up some pistons.
The choice is yours to make.