I purchased a set of 440 injectors from a member on here. He is telling me that they would work fine for what i am looking to do but i am starting to have doubts. I plan on running 9-10psi on a t3/t4 turbo. Will these injectors be maxed out? I don't want to take the chance of locking one up. I mean I am running 6psi now with no fuel management and I know I am running rich on the stock injectors, so I think I might be ok with these injectors but I just want to make sure.

 

These injectors will not be enough. There is an injector calculator that says for X amount of HP you need X CC's of injectors. If your pushing what most people are pushing at 9 - 10PSI you should be safe and get some 600's or 660's.

 

they'd be pushed hard for sure, even with bumped fuel pressure. i agree 550s would be safer, but i wouldn't say they won't work. they'll def at least almost be maxed though

 

You do need bigger...

But just out of curiosity what T3/T4? specs.

Regards-

Todd

 

to tell you the truth todd i'm not sure, it was a custom kit i bought, and i can't really find any numbers on the turbo, i didnt really look that hard yet, but nothing that is obvious

 

the greddy kit uses 440cc injectors and i have em maxed out at 275hp 10psi. i just purchased 750cc injectors. how much hp are you planning on running? my guess is that the 440s is NOT going to be enough

 

I'd like to hit anywhere between 275 and 300whp. The injectors didnt ship yet so I asked the guy to give me a refund. I have one more question too. I have a 9psi turbosmart wastegate spring. I want to run 10psi. Will it be spiking to 10 most of the time on this spring or should i just get a 10psi spring and change it out?

 

550 cc injectors and 10psi spring

 

Yeah definitely need bigger. You can run lower PSI and be fine. 440 cc is good to about 250 to 260-ish WHP before you start maxing them out. Did you get the 440's for free or something? Not much different in price on injectors. By the way PSI is irrelevant. It's HP level that you have to worry about fuel wise. Injectors are rated for certain HP, since different turbos, SC and fuels all get different HP numbers at the same boost pressures.

 

i peak 14psi running 320whp on 440cc and still run rich.