I have a 94 z28 and i have 36lb injectors off of a supercharged buick park avenue ultra and I was going to put them on tonight but my friend said i had to reprogram the pcm so I didn't. Well what I really need to know is if I halfto reprogram the pcm and if I do how would I do that?

 

You have asked questions that just made more questions. What have you done to the car that would make you need to change the injectors? Computer programmers can tune your car to run using the new injectors and make them work correctly. You need to know the flow rate because if they are not the same it will throw off the tune also. If you don't have the ability to do it yourself there are several good ones out there like pcmforless, Madz28 and Trifecta.

 

The reason i want bigger injectors is because i have a 58mm TB, intake and ported heads and i thought they would make it run better. The injectors I have are 347cc/min @3bar 12.0 ohm 36lb/hr if that helps any, and I looked at those programmers but I want to be able to tune it myself not just send in my pcm, do you know of any good tuners? all i can find is like hypertech but i dont think I can change anything with that

 

well did you have it retuned after adding hte 58mm tb or the ported heads?

if all of this has been done you have to get it reprogrammed. but before you do i'd add a cam/spings, timing set, headers, cai if you haven't already. once those are done take it to someone and have it tuned on a dyno chassis.

where do you live?

 

You will probably damage the engine putting in 36lb injectors w/o tuning for them.It will be getting ~75% excess fuel. It may not run at all, if it does it will be pig rich, foul the plugs, and wash down the cylinders.

Rich

 

For those mods, I doubt injectors of that size are going to be needed. The Hypertech tuner will not tune for injectors, cam, heads, forced induction, ect, its capabilities are very limited. You will need to bite the bullet and get a mail order tune or take it to a shop if you want your PCM tuned accordinally. As pointed out above, just slapping in bigger injectors without a tune can pose some major issues.

 

To tune yourself, you need LT1_Edit or TunerCat

http://www.carputing.com/

http://www.tunercat.com/

Those injectors are good for over 500 flywheel HP.... I don't think you're there yet, if its only the 3 mods you list.

Suggestion - Add a "signature" with basic info about your car... year, model, engine, tranny and any major mods. That way people can provide more accurate answers. I realize you typed the year/model in your original post, but a "signature" makes it more visible.