I have heard of people getting better gas mileage and more power after installing larger fuel injectors.. I'm thinking the better MPG is from NEW fuel injectors and not larger ones (Larger ones spray more fuel) But my question is on a stock 98 mustang GT with 75,000 miles will I see any benefits from putting in new ones?

 

That doesn't happen...

 

so its just bs from people who shelled out cash and didnt get anything for it..?

 

What's funny is you can't just put in new injectors without having it tuned. The car wont run.

If the mustang was a honda or a Mitsu then yes it would help. I will say 100% that you don't know anyone with a mustang that's done this.

 

Damn ricers always srpeading bad info. Injectors are supporting mods not power mods. They will give you no performance gain at all and installed untuned will destroy your gas mileage if the car even runs.

 

"Magazine mechanics" is what the tuner at the dyno shop I use calls them.

 

My tuner sent me my temp tune so I could drive it down to him, he set it up for 42's and not 60's like I told him. I would barely idle with me under the hood messing with the throttle. I actually think I may have mushroomed a valve right then but didn't notice it until much later, even after I tuned it and drove it all summer.

 

running rich wont hurt the engine. It will die before it can.

 

Is that what happen in a tune, that they run rich? I thought the pulse would be off and cause it to erratically combusted at alternating intervals causing it to buck and back fire.

 

If the high and low injector slopes are configured for 42#/h injectors the PCM will calculate the pulse width to squirt the needed amount of fuel out of 42# injectors.

If the actual injectors are 60#/h units that pulse width will cause too much fuel to be injected and the result will be a rich mix. In closed loop mode the PCM will see that it's running rich and adjust the short term trims to try to lean out the mix--but if the trim gets below -25% and stays there it will have runn out of adjustment range and throw a DTC. P1130 and P1150 most likely...