Quote:
Originally Posted by Zat_Zuma
Fuel pressure gauge
You may have to increase voltage to the fuel pump by way of a relay to supply battery voltage to the fuel pump.
Or go all out and install a fuel pressure return system with the power supply voltage relay.
It's more of a common problem than what most people realize with FI and bigger injectors. A good steady 14 volts to the fuel pump, would go a long way.
In my case, fuel pressure drops to 42 psi @ 7500 RPM. Idle 62 psi. I had a plugged pump suction screen before and only had 24 psi @ 7500 RPM causing a extreme lean condition. 
For the record, I haven't done the power relay yet, but plan on a complete fuel return system, voltage relay, regulator and fuel filter to be located on the outside of fuel tank, where they belong. I don't like the OEM fuel pump/filter/regulator design at all and will be changing it this spring. |
Unless you have added some type of FMU fuel pressure riser setup...... which you may have done, i dont know your setup.
Fuel pressure in a 370z should ALWAYS be the same. It is a static base pressure returnless system.
If your idle is 62psi, that is too high, your regulator is unable to do its job. Normally I would say your fuel pump is too large for your configuration and you need to modify the swirl jet oriface, but if you are down to 42psi at 7500rpm than your fuel pump is unable to keep up with your HP needs.
If you are running just a basic pump upgrade and injectors, than your fuel system is performing poorly all around. You should double check your numbers and contact me I will help you get it right.