Quote:
so I'm assuming that the larger rail will mean lower pressure with the standard unit
Not strictly true………, the return line from the f/ rail, goes via the f/reg, this will regulate the fuel flow, thus inducing fuel rail pressure as per stock level approx..... this by no means is suitable...
A simple way would be:
If you look at filling two drums up using a garden hose, set at a predetermine flow rate, one container being a dustbin, the other a bucket, they both have different volumes, but once full to over flow, both will pass the same volume of fluid over time.
High flow pumps, in some cases, will cause an increase to some degree, to fuel rail pressure, as the volume of return flow from rail/pump etc can be much greater than a stock regulator return though put allows for, (bottle neck), thus an increase to f/rail pressure can accrue.
Looking into the fuelling system of the 3sgte/gt4, I would not push any engine without a suitable fuelling system, this would be:
Improved fuel lines/ fuel pump, fuel regulator, with a fuel collection swirl tank, thus guaranteeing a constant fuel supply at al times to the fuel rail.
Vehicles with high levels of grip and power, fuel in the tank will be forced away from the pump pickup, the design of the stock set-up is fair, but no means suitable for high levels of power & track use …unless you keep the tank topped up to the upper level.
I have on occessions incurred moments of low fuel pressure with dropping oil pressures especially heavy braking into corners, anything under 1/3 of a tank is a dangerous zone to enter into..
Have others monitored fuel pressures , on the move..
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