IGY

Run the 4x1680s at 42.5 psi or you will run out of pumps at about 22-23psi with the walbro's. I run 2x550 and 2x1680 2xwalbro at 62.5 psi static and have enough fuel pump to run about 23 psi. Lower fuel pressure and bigger injectors is the way to go because the pumps flow more at lower pressures. I tried the 4x1680 setup on my side ported FD and had problems because the power fc can't fire the inj at low enough duty for idle(fucked a motor because of fuel in oil contamination). With my secondary bridge I ran the 4x1680s and the idle and driveability was better than with the 850's. With 850's and 1680's with 42.5 psi static fuel pressure, I was hitting 92% at 20 psi on the bridge. These are all with a 67-1(flows very similarly to the T70 up until about 20psi).

1Revvin7

Thxs guys.

93 R1

Damn I think you read my mind 1revvin7. Thats almost the same damn turbo/motor setup I'm going with.

93 R1

Hey IGY didn't you guys experiment with wiring a 3rd set of injectors in parallel with the secondaries and running the whole damn thing with the PFC?



Did it work out? I would think that thats the way to go since you could run 850 primaries...for the smooth idle and 4x1600's for secondaries and tertiaries. That way when that T70 buries the boost gauge you have no worries about fuel.

whiplash

9BASE3:



I can dig up some new photos... I need to post motor photos too. stay tuned.



thanks though!

IGY

Actually yes, Dragon ran a six injector setup w/ 2x1680 2x550 and 2x720. It worked very well for him. If I was running 2x6an fuel lines instead of the single 8an I would have his setup on my car right now. It actually blocks off the secondary holes and you run 4 injectors in between the upper and lower intake manifold. He was hitting something like 75% at 25psi with the T70.

little rotor

Why move the secondaries from their original position? Do you have any pics of the setup?

jspecracer7

simple. Because there's no point in running 3 fuel rails.

little rotor

Agreed. Is there any reason not to keep the factory secondary position, add two more injectors plumbed into the primary runners between them and make a new rail?

1Revvin7

Actually yes, Dragon ran a six injector setup w/ 2x1680 2x550 and 2x720. It worked very well for him. If I was running 2x6an fuel lines instead of the single 8an I would have his setup on my car right now. It actually blocks off the secondary holes and you run 4 injectors in between the upper and lower intake manifold. He was hitting something like 75% at 25psi with the T70. [/quote]

I like that idea, or maybe even just add a couple teritaries(sp?) injectors at the tb elbow? I forgot how many drivers my e6k will allow with already 4 high impediance injectors, but I could always add more inj drivers...