I would like to go to a 3.25 inch blower pulley, I currently have 42# injectors with GT500 fuel pumps. Should I have enough fuel to handle the upgrade? I will run on Dyno checking air fuel ratio. I know by upgrading injectors all would be fine, but if it isn't necessary, I do not want to at this time.

 

Brenspeed uses 41# injectors with their 3.25 pulley. You will be okay with fuel, but I would worry about your bottom end blowing with that much horsepower.

 

I have 39 lbs injectors and 3.25 pulley with gt 500 pump dyno 467 rwhp but backed it down a bit

 

Thanks for the help.

 

It also depends on what your current pump system is. INjector and fuel pump duty cycle would give the real story.