So what exactly will aftermarket feul injectors do to my frs
 

So I have the srt header back, and greddy intake, what would a 450cc injector do compared to stock? And what does cc stand for anyways? Sorr if I sound stupid guys but I kinda am:eyebulge:

If you just swapped them then you'd most likely damage your engine.

If you retuned for them then it'd be much the same as it is now.

Bigger/higher flowing injectors are for when you're making a lot more power than stock.

That's what I figured, thanks

cc is actually cc/min or cubic centimeter per minute. It's the flow rate of the injector but it's still ambiguous because the flow rate changes as the fuel pressure changes. As far as I know the industry standard, if there really is such a thing, is to test automotive injectors at 43 psi. If you increase the fuel pressure the fuel flow will go up. If you increase the air pressure that the fuel is spraying into with forced induction, the flow rate will go down.

Gasoline engines are designed so that the injectors aren't the limiting factor in power so going to a bigger size wouldn't matter.

Flow rate of injectors does matter because if you just go swapping willy nilly between 300 to 1000, you'll end up flooding your engine. You will need to tune for the newer injectors.

If you're running your 300cc injectors at 90% then swap to 1000cc injectors, those new injectors will still run at 90% until you tune it down.

Oh for the love of god, seriously?! I was expanding on what ft_sjo said and he already covered that. I was trying to say that the injectors presently in the car aren't a hindrance at stock or near stock power levels. Thus larger injectors alone wont be beneficial.

Gotta make sure the newbies don't get all confused and start threads asking why their cars are dead and they don't have any fuel left.

Give the ECU a bit more credit here... if you ran bigger injectors it wouldn't just run the same duty cycle and ignore the O2 sensor. It would probably end up in limp mode because of how overly rich it was running and an inability to properly compensate, but it's not like it'll just take it and keep going until it hydrolocks.

If you add larger port fuel injectors without a tune:
- the ecu will attempt to compensate for the over fueled condition that will exist any time the Port injectors are running with the long and short term fuel trims.
- if the ecu maxes out the fuel trims you will throw a system too rich code

If you add larger port fuel injectors with a good tune:
- you will add a little bit of peak power production head room since you will effectively reduce the duty cycle of the port injectors
- you will be wasting your money if you are not running enough mods to need the additional fueling capacity larger injectors will provide (for example a turbo or stg 2 super charger kit)

In short, don't bother until your tuner tells you that you need them and then ask them specifically why you need them. If they can't explain it you then go to another tuner.