My main question involves the ecm and the injectors I know the injecters are bigger but i have an aftermarket hypertech chip in my car will i still need to change ecm even though it has an after market chip in it? I have had a 91 caprice cop car 350 with ecm sitting for a few months and i know the ecm wouldn't work because it's out of a newer car then mine any help would be greatly appericated

 

no, you dont have to change the ECM.

i still have a hypertech chip in my car, and i have a pretty non-stock setup. it runs perfectly fine for me for some reason. i am sure that with a custom chip i will get more out of it though.

-brian

------------------
1991 Camaro RS - Ultra Blue Metallic, T-Tops
----------------------------------------------
GM 350 HO Crate Engine - Vortec Heads, Edelbrock Intake, Holley 670 CFM TB, Edelbrock Water Pump, March Pulleys, MSD 6AL, Blaster Coil, 8.5mm Super Conductors, Cap and Rotor, Rapidfires, Hypertech Fan Switch & Chip, SLP 1 3/4" Stainless Headers, 3" Cat Back, Flowmaster 40 Series
700R4 - 2,400 Stall Converter, Vette Servo, Shift Kit, B&M Super Cooler
GM 10 Bolt -coming soon Auburn Pro Series Differential, Richmond 3.73s
Brian's 1991 RS Central NY F-Body Association
Join the Third Generation F-Body TBI Web Ring
z28boy@twcny.rr.com IM name: Z28 Boy

 

Brian i see you have an after market TBI unit did you run the car with the factory TBI and 350? So basically what your saying is i shouldn't have any problem ECM wise but the 305 TBI unit wouldn't work at all correct?