At what point is it smart to replace the stock fuel injectors either upgrade or stay stock? I have 95 z28 with a hot cam kit, accel ignition system, hooker headers back to borla catback, fluid damper, lightend flywheel and it is pcm for less tuned. I may have forgotten something. The whole car has 91,000 on it.

 

it depends on your horsepower level. Your good up to about 350 fwhp. Where are you with those mods

 

With your current mods you are fine with stock injectors.

For future mods, you only want to run your injectors up to 80% max duty cycle (if I'm not mistaken), anything over that will require an upgrade.

 

i havent had my car dynoed so i dont even know what i am making. I figured 90,000 miles on the injectors i might as well change them and if i do i might want to upgrade. How about an adjustable fuel pressure regulator. I also a 52 mm tb on it i dunno if that makes a difference.

 

An adjustable fuel pressure regulator is of no value at all, unless your injectors are approaching 100% duty cycle, and you want to increase the pressure to increase their flow rating. Would require reprogramming. Listen to the advice above... you don't need larger injectors.

 

Larger injectors are not an "upgrade" in this case. Larger injectors can supply more fuel, but you can't just dump fuel unless its needed. You may think since you are putting new ones, why not go bigger, but if your engine doesn't need it, you will be basically paying to have your car tunned to tell it that it has bigger injectors but to supply the exact same amount of fuel as before. Also wit your mods I don't think you will see much out of a 52mm TB, a afpr is def not needed. I didn't see a CAI on your list of mods, I would spend my money on that next.

 

https://www.camaroz28.com/forums/sho...d.php?t=586705

Alot of good information got posted in that thread, check it out.

 

I left out some of my mods i forgot. I have granetelli mass air flow sensor. Callaway honker cold air intake. Polished intake pipe. Mild head work, deck, thinner gasket, gasket match, mild porting, 5 angle valve job.

 

Before you go any further, create a "signature" with basic info about your car - year, model, engine, tranny and any MAJOR mods. Providing that info up front helps people help you.

 

good idea and it has been done