Trying to get my ducks in a row for the 370 swap here soon, been thinking about the 43lb injectors, do I need the 60 lb? Here's the mods when the new motor goes in: Twin walbro 255's to -8 line to aftermarket fuel rails with boost ref reg, use stock feed for return. The 370 will see 10lbs of boost and the big meth nozzle comming on at 2psi and full at 8lbs.
So...if I use the boost ref on the reg will the 43lb injectors be enough? also what pressure should it be set at? Don't have a AFR meter yet, so want to be "safe". Thanks

 

Maybe I should rephrase. Do I really need bigger injectors (like 60lb). I have read that a boost ref regulator might not need the big injectors......?

 

I would go with the bigger injectors. On my 6.0L at 10 psi and with meth I was seeing over 100% duty cycle.

 

Were you running the 43lb or stock?

 

42# with a Radix

 

WOW, you are way over building you fuel system for a 10psi 370 with a centrifugal blower, lol. A single pump and stock lines would probable feed it just fine, maybe an additional pump, but mostly wouldn't even need that. 43lb injectors are only good to around 500rwhp, how much are you looking to make? I'd run the 60's if it was me.

I hope you upgrading that super charger too, a P1 is a bit to small to feed a motor that big to that boost level. Your gona need a D1.

 

I'm going for the 60 lb inj.,just talked to Ed Wright. Yes, I want a D1 but trying to spread out the costs a little on all this, someday... The fuel sys Im doing now because it's not a big outlay of cash and the truck will be down anyway. Thanks for all the input, this has been a big learning experience for me and have thoughly enjoyed it (except for the spending $ part)....

 

60's

John