With my current Paxton setup I'm running 66.5 lb injectors @ 60psi of fuel pressure which are really 56.6 lb @ 43.5 psi. What I'm looking for is 60 lb injectors @ 60 psi. Any vendors out there that can help?

 

You can get 62lb mototron injectors @43.5 pm me i'll tell you where.

 

PM sent. Thanks

 

Jerry, those injectors are larger than what you already have. They are 62lb/hr @ 43.5psi which makes them about 72.8lbs/hr @ 60psi. I will look for something smaller for you.

 

Thanks KILLR. I need injectors that flow 60lb/hr@60psi.

 

You need 51 lb/hr @ 43.5 to yield 60 @ 60.

I know Siemens makes a 55 and MSD/Holley makes a 50. I'd err on the bigger side

Alternately you can look for a 535 cc/min but they generally have import tops on them.

 

Unfortunately since there is no real tuning for the Hemi it takes a perfectly sized injector to make everything work right. We can't error on the big side so he needs that 51lb/hr at 43.5 psi.

 

Oh yeah, I forgot about that. The only option I can see then is a 535cc injector from a custom injector house (like RC Fuel Injection etc).

On the other hand, the 50's will work out to 58.7 lb/hr at 60 psi. Workable?

 

Here's my situation. I first ran 50lb/hr@43.5 psi SRT injectors, which should have given me 57lb/hr@60psi. I couldn't give my truck enough fuel so I added 2, 48lb/hr@43.5 psi auxillary injectors into the set up and that still didn't work. I was still lean as crap. I then got 56.6lb/hr@43.5psi which then gave me 66.5lb/hr@60 psi and then I couldn't take away enough fuel, even after I switched over to a return style fuel system with a boost referenced fuel pressure regulator set at 30 psi at idle. With the regulator set at 30 psi, those injectors should have given me 47lb/hr@30 psi at idle and with 13 lbs of boost, netted me 60lb/hr@60 psi. The SRT injectors should have worked. My thinking is that maybe the SRT injectors flowed way less than 50lb/hr@ 43.5 psi. What do you guy's think about that senero? I just need help. Thanks in advanced.

 

There may be some variation from injector to injector, but not enough to matter. If the SRT injectors are rated 50 @ 43.5 they should all be pretty close. It definitely would not be the case that some are 50 and some are far enough off to cause a major problem with fueling. You could always have them flow tested. Are you sure you were holding fuel pressure up top? Maybe you don't have enough fuel pump and the smaller injectors are starving?

10lb/hr isn't a huge amount. You should be able to drop from 66.5 @ 60psi to 60 lbs/hr by dropping your fp to 48.8 psi.

Why not put the 50s back in and crank up the fp a bit? 50 @ 43.5 = 60 @ 62.6psi.

I don't follow what you are trying to do by setting the idle fp to 30? It seems cart-before-the-horse-ish to me. IMO, you should set the idle fp with the vacuum line off (so it reads atmosphere) and set it the fp your truck should be running at. With that set, see where you are in boost and adjust your injector size to fit your needs.