injectors, when to upgrade?

[cwdunnet]

i have 19 lbs, and i was wondering when should i upgrade to 24 lbs, and will do do anything performance wise? what else to ihave to do if i upgrade to 24 lbs, thanks

 

[tmoss]

I doubt you need to upgrade - but the only way to tell is to get a dyno done with a wide band so you can see what A/F is really doing.

Upgrade injectors when you have fuel pressure up to 44psi and can't maintain 13-14:1 A/F ratio.

 

[DMAN302]

Often I have heard the general rule that you upgrade injectors after your making aprox 350 flywheel horse power. A/f is the ideal approach but not available to everyone. Your present setup will work well with the 19's...24's will only serve to lighten you wallet with your combo.

 

[tmoss]

A/f is the ideal approach but not available to everyone.

Then it's a shot in the dark, but doable. The EEC adpative control feature will make adjustments if the injector over/under sizing is within the EEC adjustment band.

 

[Matts89LX5.0]

i always thought 19 # inj were good upto 300 hp motor....i would do the entire fuel system if i were you...24# inj, 75 pro m meter, and 255 in tank pump

 

[notchback]

i always thought 19 # inj were good upto 300 hp motor....i would do the entire fuel system if i were you...24# inj, 75 pro m meter, and 255 in tank pump

thats way overkill. if you anticipated needed it , then when it's time to upgrade yes. but i ran 12.50's all day long w/ 19 lb'ers and a 190 and it ran flawlessly.
fp guage up on the hood and it never looked weak at all.