Fuel pressure formula ??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Mikel · 12-20-2004, 08:25 AM

Two things:

The Walbro 255lph High Pressure will keep up with some pretty high fuel pressures. I was running 43psi static and 1:1 rising rate indexed to boost on my GN. This translates to about 65psi at full boost. I believe it's part number GSS340

If you get a good AFPR, you can adjust point of onset so that your idle fuel pressure is the same as stock, and fuel pressure doesn't begin to rise untill you see positive manifold pressure. A good example of this is Cartech's regulator.

j6k · 01-05-2005, 03:30 PM

here's a formula, i think it's from GRM or some engineering book i have...

New flow = Old flow x (New pressure/Old pressure)^1/2

01-05-2005, 03:30 PM	#2
j6k Join Date: May 2004 Location: Mt. Vernon, WA Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	formula here's a formula, i think it's from GRM or some engineering book i have... New flow = Old flow x (New pressure/Old pressure)^1/2

12-20-2004, 08:25 AM	#1
Mikel Join Date: Dec 2004 Location: Memphis Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	Two things: The Walbro 255lph High Pressure will keep up with some pretty high fuel pressures. I was running 43psi static and 1:1 rising rate indexed to boost on my GN. This translates to about 65psi at full boost. I believe it's part number GSS340 If you get a good AFPR, you can adjust point of onset so that your idle fuel pressure is the same as stock, and fuel pressure doesn't begin to rise untill you see positive manifold pressure. A good example of this is Cartech's regulator.