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6.5 NA injectors on a turbo ?

This exact thread was done earlier this week. And no they wont work better on a turbo 6.5. The injectors are the same vice pop pressure, and the turbo'd application is better served by higher pop pressure because the computers are programmed to output more fuel. On a stock PCM program, probably woulnt make much difference, but with a custom tune with more fuel it would.

On a stock program youre looking at about 45% more fuel on turbo application truck. With a custom tune youre looking at 75% more fuel than a N/A truck program. Would be better served by better ignition efficiency of higher pop atomization.
 
Pop pressure is not the issue, its all in the pintle design. Nobody seems to now what style pintel these have.
 
If they are factory style then then it has same nozzle size and spray pattern as the factory style turbo injectors, pop pressure being the only difference. Thats what the Stanadyne engineer told me at least.

So pop pressure is the only issue.
 
you know my setup, buddy,, would these work for me? or if I do get them, should i take them and reset the pop pressure to ??? psi for the turbo app.
 
I wouldnt run them at low pop, because you can output 75% more fuel than a N/A application, so ideally would be using slight higher pop pressure than turbo injectors. Thats why I use the "marine" injectors, for 100psi higher pop.

If i was building it to be a tow truck primarily where you would be under load a lot of the time I would set them to 2200psi for best performance/economy under load, but if it was a commuter then the stock turbo injector pop (about 2060psi) would be good for empty hwy driving and occasional loading. The higher pop is primarily useful for high fuel rates, so a turbo truck can use N/A injectors fine but wont perform as well or as efficient when under load.
 
I think lower pop flows more fuel,mine are at 1500-1600 psi. Higher is better for atomization.
 
It wont flow more fuel, becuase all the same amount of fuel is being pushed into the plunger/lines, just depends at what pressure it starts spraying. Line pressure goes way over pop pressure so the same amount of fuel is coming out unless you change the nozzle size. Better atomization of the intial spray will lead to better mix, ignition and complete combustion when you are throwing more fuel in.
 
The only thing limiting pop pressure is the condition of the inj pump,cranking pressure,I believe a brand new head and rotor might be able to pop 4000 psi hot start,I had a good used pump that wouldn't start 4800 psi hot,but it did cold. I will eventually go higher than stock and let you know if it starts hot,and if fueling seems the same.
 
I might test up to 2300psi with something I drive, maybe a little higher for something just for racing or sled pulling. Although at the same time I would want to advance injection timing if increasing pop pressure and dumping more fuel. You will find that the turbo electronic timing curve starts about 6-8 crank degrees earlier than the N/A programs from idle to 2000rpm, perhaps to compensate for 300psi higher pop pressure and good amount more fuel.

With a larger nozzle, more of the fuel that does get into the plunger (or fill chamber, Im not up to speed on the IP internals, but that some of the fuel put in gets recycled instead of pushed out) may be pushed out at the same pressure it can build up.
 
I think we have pretty much the same idea. My problem was my pump was loose and in hopes of more fuel I lowered the pop pressure,with a good pump there should be less internal leakage at higher pressures.
 
Well if anyone cares or not,,, I just got off the phone with my local Injector pump place, and they quoted me $6 ea to recalibrate and equalize these N/A's to 2200psi for me. Plus an install kit for $31. can't beat that with a stick!!! :D
So $115 to Anubis for a set, plus $50 for the set up and 31 for the kit, = $196 for a new set of Delphi's set to marine spec's, for my truck with my Tricked out Buddy tune! Me-so-Happy :thumbsup:
 
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