I have a set of headers, cam, CAI, exhaust, and tune right now on my LQ4. I will soon be replacing the heads, am I at the point that right now I should be thinking about replacing the injectors? If so should I just get 8.1 injectors or get some aftermarket injectors? Once I replace them, would the tune have to be changed? Thanks

 

Look at your software, it will tell you the duty cycle of your current injectors. Read the data the software is telling you and decide from there.

Yes, new injectors change the parameters of your tune and it would be wise to recognize those changes with your software. (I keep saying software because both EFI Live and HP Tuners can do what you're needing, and I'm not sure what you use.)

 

If you IDC (injector Duty cycle) is really high or your leaning out really bad are good indications that you need bigger injectors... You might be able to get away with just a fuel pump, but more than likely being a cammed 6.0 you will need new injectors...

 

See I will have the truck tuned, there is no way in hell I could ever tune a vehicle. Haha, I do know that the cam my 6.0 standards isn't crazy but I would like to know before I take it and have it tuned if I will need injectors.

 

When your IDC gets above 86% they are considered Maxed out..

 

I would be willing to bet that what you have now is real close if not maxing them when your in the throttle. I would look for some injectors if i were you, pref 44's if ya can get them, or 60's if you ever plan on FI or Nitrous..

John

 

So I guess I should try and get some 8.1 injectors? How would running those affect gas mileage? Should I replace the fuel pump as well or would it be more than up to the task? Thanks for the help guys