More Fuel!

[unreal808]

I will probily not need this much fuel with a 16g with a 225lph pump and 550s, but I wonder how far 550s would go with 8 an lines instead of stock lines.

[Shane@DBPerformance]

Not any farther. If you want more out of 550s, you can turn up the fuel pressure.

[unreal808]

If I take stock fuel pressure lets say, 28 X (550inj / 450inj) = 34.2psi is what I should set the FPR at right?

[Super Bleeder!!]

not sure what you are asking now.

are you trying to find a base pressure you can run through a set of 450s so that they'll flow the same as a set of 550s at oem base pressure?

[unreal808]

The new fuel pressure would be 34.2 psi, stock would be 28 with vacuum hose attached, spec is for a car with a turbo and manual transmission. unless my book is gay.

[EclipseGST]

I dont remember if you have a 1g or 2g... So I'll list both. 1g stock fuel pressure is 36-38psi. 2g stock fuel pressure is 43-44psi.

[Shane@DBPerformance]

Injectors are normally rated at 43.5 psi also. So, when the 1G runs 36-39psi stock, you aren't getting the full rated capacity of the injectors. If you run 550s at a base pressure of 52psi, then they will act like 600cc injectors. I like to try to keep the base pressure + boost pressure under 85psi. When you turn up the base pressure though, it is harder on the fuel pump. So, if you are running out of fuel pump, but not injector, then you might want to actually try lowering your base pressure to get more flow out of the pump.

[unreal808]

I have set my fuel psi to 43 based on logging info. so I was not off to much than.
But by math 38psi X (550/450) = 46.4 psi. I still have some room to adjust positive for fuel on the AFC. Exc at idle I’m +50% at 1000rpm with 119 trim.

My specifications for 90-94 turbo engines is
36-38 psi with vac hose detached
26-28 psi with vac hose attached

[JET]

Are you running 550's? It sounded like you were earlier. If so that equation you are using doesn't mean anything at all. That equation is used to figure out the fuel pressure needed to get 450's to act like 550's.

[Street Surgeon]

You can make a very good amount on most of the stock componets, the biggest restriction IMO is the fitting if you run lines to your factory rail. As seen in the pic it REALLY necks down. Dent Sport Garage will weld on AN fittings to the factory rail and it helps considerably!

In the somewhat near future I'll be running the Bosch 044 fuelpump, not sure if I'll keep the -8 to the rail or go -10, FIC 950s, keep my -10 Aeromotive rail, and -10 Aeromotive FPR, -6 return.
http://www.pinamotorsports.com/albums/album82/DSC02428.sized.jpg
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