Bigger Injors

[drftnfrysi]

ok so i recently pu some 550cc injectors into my rb20 and now its decided to run on 5 cylinders

i understand when changeing injector into a car thats not tunes for them the car will run rough is this 2 rough

now i dont want to got o a tuner and them tell me that the injectors r f**ked and have to pay for a nothing result and still be up for new injectors the car did run on 6 cylinders for a short period of time after i turned the fuel pressure down but now it's back to 5 when i purchased them i was told they has just been highflowed and unused since with new o rings fitter now this it did have new o rings so am i to pesime the rest is true i need help

[Simon-S14]

have you checked that all the plugs are making contact? Start with the basics and while the engine is running pull a plug off the injectors (thats how you spell it btw) one at a time until you find the one thats not working.

It could be a sticking injector... replace with another one or get it cleaned and benchtested

[Green_s13]

i would be getting the injectors flow testing not just to make sure the highflow was done right otherwise you might have one that is 555cc and another that is 530cc and this will make a difference in engine life. also it will tell you if one is stuffed.

[heller44]

Let me get this right.. you installed 550cc injectors into an rb20, without retuning or replacing ecu, all you did was turn the base fuel pressure down?