Injectors installed lugging under boost

[96talontso]

Just installed my FIC 780cc injectors that i got used. (I know they no longer make these). I started my car and its idling fine, little bouncy every once in a while but let it fully warm up then took it around the block. As soon as i got up around 6-7 psi the car immediately slowed down and started misfiring. I set my afpr to 43 psi with the vaccuum line off.

I think its my tune. (Im still stock tune)

 

[Arthris]

According to ## mods list you dont have anything to tune with. You cant just drop bigger injectors and hope the computer knows that now its injecting more fuel. You need to get link. A safc only is able to compisate for 660cc injectors. Pull them out untill ## able to tune ## car for them. Other wise ## going to wash out ## cylinders and put fuel in the oil

 

[clipto]

you need to compensate for bigger injectors in your tune as it allows more fuel to flow and is probably why your bogging out. I would invest in ecmlink. switch back to your stock injectors until you get a tune.

 

[ncdirtrider249]

Yeah, some sort of AFC or tuning system is needed. You can't just put in injectors that are almost twice the size of factory injectors and think it'll run good the first go-round. SAFC's are generally only good to 650cc injectors, after that it gets harder to tune them. I'd either get smaller injectors, or get dsmlink or something to tune the car with. If you don't then like what chrisverneuil said, you'll wash out the cylinder walls and get gas in your oil...and that's no bueno.