I just installed 30LBS Accel High Impendence injectors, I was wondering if the computer will still act as if they are 24lbs, or will a tune be required?

 

You should tune. You just need to change the injector constant to reflect the 30's. The pcm will still think you have 24's in there but since there 30's now, it will wanna run rich, or actually it will be trying to pull a bunch of fuel out cause it's getting more then it should.

Ken R.

 

Not a good way to run. The PCM would need to pull 25% fuel out using the long term fuel corrections. The long terms are limited to 15% reduction. So it would be using the short terms to make up the balance and that sort of screws up the PCM's attempt to dither the A/F ratio back and forth from slightly richer than 14.7:1 to slightly leaner.

It might be passable at part load, but don't even think about going WOT. Since the long terms are pulling fuel, the BLM's will default to 128, and its going to run 25% rich, on top of programming that's already too rich at WOT. So rich that its going to be washing the lubrication off the cylinder walls, diluting the oil, fouling the plug and the cat, etc.