Originally Posted by
Madsceintist
Summit Racing sells adjustable regulators, as well as any import performance shop. Problem with that is that a regulator is spring set and or spring set/vacuum controlled, which puts a major limit on your range. Springs have a certain range they work within, depending on the force applied. Vacuum assist gives some benefit as that the vacuum increases pressure by demand. Regardless if you eliminate a regulator in the system designed for one you don't get enough fuel when needed, thus to lean and starving for fuel. Also, its easier to adjust the voltage to the pump(which has a check valve to hold a minimal pressure), then to have a fully adjustable regulator on demand. Your not limiting the supply of fuel by reducing the pressure, just reducing the pressure, however you do limit the supply if there is no fuel!
Weapon_R
Because you reduce what the regulator can regulate, doesn't mean it's not working. A pressure regulator holds pressure UP TO a determined amount, then releases at that point to keep a specified pressure.
Unless you can program the ecm, cpu, cars computer then you can't stop the injectors from opening. If there's is fuel present under pressure or not it will enter through the injectors due to slight pressure that's inherent to a pumped system. I.E. back to the to lean and being starved condition.