Worse with 550's? Help!

[BigRb247]

I just put my rc 550's in this moning. Before i had them in when i wanent to floor my car it would sputter around 16 psi. But it hit hard until that, like you could totaly tell it was pulling. Now that i jsut put my 550'2 in, it feels like the car doesnt pull at all and it sputters even worse. You can check mmy mod list. The only thing i could thin of is that its not tuneed. But i wouldnt think it would effect it this much. ANy feedback would be appreciated!

 

[98eclipseRS]

yes it needs to be tuned. Your car doesn't know that you have larger injectors in so now you are running way to rich. You need to get a 2g mas or some sort of fuel management.

 

[98TsiAWD]

Could have bad plug wires also.

 

[nowayout]

log it and adjust you AFC to the 550 you need to lean it out if you had stock injector in it before.