I am in the middle of the 4.8 build up and I need some help with choosing the right injectors. When i had the radix it had 42lb injectors. the engine is going to flow some serious air and fuel. It might be n/a but I wouldnt be sure about that. Anyone have a idea??? Thanks
-matt

 

My Ford 42lbers are supporting a 6 liter with a cam, 10psi of boost, and a 100+ dry shot. Without knowing your specific combo I cant make a recommendation, but I would think that 42's would support all but a full race 4.8

I know there are 2 schools of thought on injector sizing, but I have always felt you are better off with the smallest injectors that can safely support the power level you are shooting for. Just my .02

 

I like to er on the side of almost to big of an injector.

I have not check my duty cycle on these 42s at max boost but doing HP calcs I am pretty sure I am over their safe limit (est. 545rwhp) With the 6.0L and 18psi or so I plan on running 55-60lb injectors. Just havn't figured out which yet

 

F8L- what Brand injectors are you going to use??

 

EFILive tells me my injectors are maxed somewhere around 6200 RPM. That's only running ~8psi too.

 

Anybody might know what injector I need to go with. Right now I'm using stock 02 injectors, but I want to go with a nice shot of spray, so what would I need to look for?

 

The 8.1L marine injectors. I guess I should say the 55-60lb injectors would be the rating at our ls1 fuel pressures too. Not like using an SVO style injector.