So I posted this in the wrong thread new to this site anyways...
I bought 500cc injectors for my d16 civic and I put them on once I started my car it blew up jk no but my cars idle was really low do I need it to be tuned or so I need a fuel pressure regulater? The mods I have added are a skunk2 intake manifold skunk2 throttle body and headers not much done to it thinking about getting a catback exhaust and turbo in the future but I am wanting to know about the use of these injectors thank you!

 

First off you need to list your year/make/model.

Second put your factory injectors back on until you actually have a need for those. And yes you will need an ECU that can be tuned and have it tuned on a dyno for those injectors.

 

It's a 1995 Honda Civic with a 1997 d16 engine in it. What ECU do I need?

 

A stock ecu to go with your stock injectors. What makes you think you need more than double your fuel flow? What mods have you done that will add 200 horsepower to your engine?

 

From the looks of it, you won't be gaining anything out of using 500cc Injectors at the moment. Your car is not modded enough nor pushing a lot of horsepower and in need of bigger injectors to accommodate the power. Your best bet is honestly to put back the stock injectors. Your car won't run right with the 500cc Until you get a tune.. HONDATA S300 installed in your ECU will allow for a tune and the use of those injectors. When I upgraded to 550cc injectors in my GSR it was because i was running a DRY shot of nitrous, and also bought a complete fuel delivery system to go along with the injectors. AEM 320lph fuel pump, AEM fuel filter, AEM Fuel rail, Fuel pressure Regulator, and the bigger injectors. With all your stock parts there really is no need for bigger injectors, you won't gain anything. But an ECU tune will make them work. Like I said, look into Hondata. GL