Alrite guys I have a fully built ls Vtec
Full head ported and polished package with aem cam gears and type R cams
Skunk 2 pro series intake manifold
I believe 68mm throttle body
Bdl fuel rail gsr injecters witch I believe are 240cc
Summet fuel pressure gage
Block is b1 blue printed micro polish crank
Acl race barings eagle rods he 10/1 flat top Pistons

So as you can see I need fuel I have walbro 250 fuel pump
My pressure is at about 42ish and If I remove the vacume I can get it to 55
I just want to kno how to adjust the pressure and what injecters to go with I was thinking 550cc or 410



Edlbrock filter and billet lines





Like this I can get 55psi if I conect the line it drops to 42





Stock injecters I beleive what does the screw do and how do I adjust the pressure

 

Stock pressure. 42.5 PSI. You don't need higher than that. Get properly sized injectors for your power goals. Also, you're missing an exhaust stud, and a coolant line.

 

You need to keep the vacuum line connected to the fpr. If you don't your fuel pressure will drop when you have no vacuum or when in boost. Stock pressure is fine as long as you get properly sized injectors. Don't mess with the fuel pressure once it's tuned or it will through your whole tune off. To up the pressure you just tighten the bolt on top of the fpr.

What are your power goals? What type of fuel are you using e85, 91-93 octane pump gas?

 

Yea I kno I just started doing extended studs and coolent line?

 

I run 93 pump gas with 108 octane mix per every 3 gallons

 

I'm built for boost I'm aiming for 500+ hp

 

Then you shouldn't play with it, and you should trust your tuner to know what he's doing there. For 500 WHP, you want at least 900 cc/min injectors.

 

108 octane mix... did that come from autozone?

 

No I'm sorry I meant 110 it's what we have for race fuel

 

The correct way to set static fuel pressure is engine running vacuum line disconnected. Set your static or base pressure then reconnect the vacuum line. Till go down as it should in vacuum and raise back up to static pressure at wot no boost and add 1:1 when in boost.

If your asking what's a food base pressure and your trying to adjust that I'm assuming you haven't tuned the car. It needs tone set prior to tuning. 50 is a good base pressure as it gives the injectors better atomization and idle characteristics.

 

Let your tuner adjust it...

 

Can you explain the no "vacuum adjustment" and what difference that makes to just leaving it connected?

 

I believe adjusting the fuel pressure without any pressure influence from intake manifold or without the vacuum line connected will give you your "static" fuel pressure. Then with it connected again your pressure will decrease in vacuum and increase in boost. Turbols is recommending a static fuel pressure of 50psi witch would read lower with the vacuum line connected at idle.

 

So fuel pressure at WOT is really the same as FPR with vacuum line disconnected? And thats where we target 43psi?

I've been doing it without disconnecting the line. So my pressure is actually lower than it should be.

 

Yes. Give or take a 1 psi and no boost added on that.

 

This is correct except if you are making your fuel pressure 43 psi with the vacuum line connected your base pressure is higher than it should be not lower.