I have a Hypertech Stage II prom chip on a 91 rs with stock ecm. what is the biggest size of injectors i can go with and keep the same prom or would I be beter off just adjusting the fuek pressure?
Moderator
just adjust the fp. in little bits till it runs best/fastest. a/f ratio monitor will help in tuning your fuel pressure.
Senior Member
you can go with 22 lb injectors but i'd increase fuel pressure either way it'll work with the stock ecm.
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1989 firebird formula
Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.
Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?
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1989 firebird formula
Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.
Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?