R33 Rb25dett Fuel Pressure????

09-08-2007, 03:42 AM
Hey everyone just joined up! I was wondering if any knows the fuel pressure a rb25dett should be running! Or what everyone else is running? I have just installed a rising rate fpreg on mine!

09-08-2007, 09:23 AM
You should be running around 44psi with the vacuum port disconnected.

09-08-2007, 06:32 PM
Vacum port disconnected? What's the advantages of that?

09-10-2007, 03:20 AM
The little vacuum hose that goes to the inlet manifold, it needs to be disconnected when setting fuel pressure, as manifold vacuum will alter the fuel pressure. Hence why a rising rate fuel pressure regulator actually works, as boost increases, it increases fuel pressure.

Set the fuel pressure to 44psi with the port disconnected, once you set it, reconnect the vacuum port and it will be safe to drive.

Also, have you upgraded your fuel pump yet, as the stock pump does not like excessive fuel pressure.

09-10-2007, 05:15 AM
Thankz For The Info! A Great Help Cheerz

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