SR Fuel Pressure setting???

[chituntang]

Hose off

Originally Posted by GroundPerformance

Leave it 3 bar and less stress to your fuel system. Most 4 bar setups are the ones running E85 that needs the additional fuel flow and better atomization. So other than that leave it at stock besides don't think the Nismo FPR are up to the task at such high static pressures or would I trust it. IMO

First, 4 bar setup does not stress fuel system more compare to 3 bar setup. It does stress our car more only because things were designed with 3 bar fuel pressure in mind.
Second, all gasoline engines benefit from better atomization, not just E85; and increasing fuel pressure is one of the many ways to increase fuel flow.

[codyace]

Originally Posted by chituntang

First, 4 bar setup does not stress fuel system more compare to 3 bar setup. It does stress our car more only because things were designed with 3 bar fuel pressure in mind.

I'm not sure I understand you here?

4 bar most certainly does stress anything more than a 3 bar fuel setup.
- Injectors rated at 3 bar FPR will run hotter/harder at 4 bar
- Fuel pumps will need to pump much more fuel, causing stress on stock stuff and or requiring an aftermarket pump that can support higher pressure fuel (remember, 15 lbs on a 3 bar setup require a pump that can support 58.5 psi of fuel...if it's 15 lbs on a 4 bar setup, it needs to support 73 psi etc etc

This applies across the board.

Originally Posted by chituntang

Second, all gasoline engines benefit from better atomization, not just E85; and increasing fuel pressure is one of the many ways to increase fuel flow.

While increasing pressure does increase flow you need to remember what the setup is tuned on/for. Regardless of a setup, when it's tuned on XX psi, it needs to stay there. 3 or 4 bar psi base makes no difference in that regard, as if you want to tune your car lets say on 50psi, that is where it's going to be set at, but you need to remember that the 72lb injector is now really 'larger' in base size (generic terms to make it easy for the O/P). As before, if the car is tuned at a specific fuel pressure, that is where it needs to be forever, as changing the fuel pressure base will change the tune.