Do I need bigger injectors

[Brett305]

I have a 2007 Shelby gt

I had a previous 2007 gt with mods and was using 47 lbs injectors

The tuner I use no longer tunes for that size on this car

Question is ..... if injectors are designed to work in the 80 to 85% range and 24's are stock on this car ..... wouldn't mods that up the air flow in and out as well as more fuel cause stock injectors to over work thus shortening life span or not keeping up with demand.

The car is naturally aspired.
CAI, larger throttle body , performance manifold , holley 300 lph fuel pump,
Currently has cat back exhaust but will be adding headers and cat delete.

The 47's worked fine in my other 07 with less mods

I also wanted a tune for E85 wich they no longer offer thus the 47's in the first place

 

[86GT351]

I also wanted a tune for E85 wich they no longer offer thus the 47's in the first place

That's probably your answer. E85 needs roughly 30-40% more fuel than gasoline to achieve the same power output, necessitating larger injectors

 

[Dino Dino Bambino]

I have a 2007 Shelby gt

I had a previous 2007 gt with mods and was using 47 lbs injectors

The tuner I use no longer tunes for that size on this car

Question is ..... if injectors are designed to work in the 80 to 85% range and 24's are stock on this car ..... wouldn't mods that up the air flow in and out as well as more fuel cause stock injectors to over work thus shortening life span or not keeping up with demand.

The car is naturally aspired.
CAI, larger throttle body , performance manifold , holley 300 lph fuel pump,
Currently has cat back exhaust but will be adding headers and cat delete.

The 47's worked fine in my other 07 with less mods

You're a long way short of the N/A 360+rwhp that would require higher flowing injectors than the stock 24lb'ers. Therefore there's no need to change them. If you do decide to chase more N/A power, Gen 1/2 Coyote 34lb injectors are plug n' play. All you'd need then is a tune. This page will give you an idea of what it takes to get past 360rwhp N/A:

Mustang 4.6L Three-Valve Dyno Runs