Procharger vacuum line question

[Bnewell101]

So long story short bought a car with procharger p-1x head unit, currently my vacuum line doesn't attach to my fuel pressure regulator. Have aeromatic 13129 regulator which is currently just open to atmosphere.
Does anyone else run this?
Are there any advantages? I wouldn't imagine so. But not sure how to branch it out.
Anyone have some insight on this?
Those of you who installed yours how did you run it?

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[80FoxCoupe]

Run it to a source that sees boost and vacuum. Set regulator to 55 with engine running and vacuum off.

 

[SheepDog]

The fuel pressure regulator needs manifold vacuum/pressure to increase fuel pressure as boost pressure increases.

 

[Toy Cobra]

The fuel pressure regulator needs manifold vacuum/pressure to increase fuel pressure as boost pressure increases.

What he said...

 

[Bnewell101]

Does anyone have pics of their setup? I'm 90% sure whoever installed my PC did not run the vacuum lines correctly and there's minimal information on how these should be run

 

[asylum938]

Does anyone have pics of their setup? I'm 90% sure whoever installed my PC did not run the vacuum lines correctly and there's minimal information on how these should be run

Check with your Tuner.

PBD has me running open to atmosphere fuel pressure regulator with 55-58psi of base pressure

Alternatively Lund has my buddy running vacuum/boost reference.

 

[80FoxCoupe]

Check with your Tuner.

PBD has me running open to atmosphere fuel pressure regulator with 55-58psi of base pressure

Alternatively Lund has my buddy running vacuum/boost reference.

That's odd.

 

[asylum938]

That's odd.

Not sure, Just doing what was suggested.

I asked if a Vacuum source was required and was told no.

car is only seeing 10-12 psi so not sure if that had anything to do with it.

 

[80FoxCoupe]

55 base fuel pressure, with a manifold source hooked to regulator seeing 12psi of boost now you have 67psi. Fuel mapping gonna be different at 12psi of boost with 55psi of fuel vs 67....

 

[Jay-rod427]

It can be tuned without fuel press reference, tuner just has to manually enrichen as rpm/boost goes up. at 12 lbs it's prob not too bad, but much higher boost and you start to lose fuel atomization because the dynamic fuel pressure at the nozzle would only be 43 lbs and so on. Static rail pressure is one thing, but the dynamic pressure with boost pressure resisting the fuel coming out of the injector can become a spray pattern/atomization problem.

The point is with fuel press referenced the dynamic pressure at the injector nozzle is always 55 lbs for optimum spray/atomization. With reference and 12 lbs of boost you'd end up with 67 lbs rail pressure, 55 lbs dynamic pressure coming out of the injector since it has 12lbs of resistance against it.

The regulator just needs vacuum routed so it sees true pressure/vacuum from the intake. No check valves or any obstructions. And really should keep that vacuum line as short as possible, and no other tees going to say the bypass valve or anything so it sees the cleanest pressure/vacuum signal possible.

 

[whatsup62]

When I ran my Sai Li kit Lund had me leave hose off.

 

[Bnewell101]

Check with your Tuner.

PBD has me running open to atmosphere fuel pressure regulator with 55-58psi of base pressure

Alternatively Lund has my buddy running vacuum/boost reference.

Originally it was open to atmosphere. Lund had me run with vacuum line attached now they're coming back saying I have a substantial vacuum leak so I'm assuming it has something to do with how the hoses are run

 

[sloride]

Good example of what boost referenced should be doing.

 

[sloride]

http://injectordynamics.com/injector-selector/

Cool calculator at 7500rpm ID1050x would roughly be 75%DC vs 85% with boost reference vs not at 12psi

 

[illtal]

This also doesn't account for any fuel sprayed by the DI. The Duty Cycle should be much lower which is why guys are getting 600+ whp with stock injectors and stage 2 kits come with LU47s

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