MAF and FPR independent from injectors?

Technick · 03-01-2003, 02:00 AM

If possible use a bigger injector. The larger the injector the less fuel pressure required, the less fuel pressure required the more control the injector has (PCM) over the pulse width. The processor can always lower the pulse width and control air fuel ratio eaiser at lower pressures than it can at higher pressures where the nozzle can lose control of the spray pattern and volume. Also little known fact--- the higher the pressure the LOWER the volume from the pump. The lower the pressure the HIGHER the volume from the pump. Its true! I have built 600 rwhp 4.6 Cobra's with 50 lb/hr injectors and used only 40 psi of pressure! Mind you this is with 1/2" feed line and 3/8 return and a Aeromotive A-1000 pump. And this was on a supercharged car with 18 psi boost! No FMU! Just a 1:1 regulator! Stock Processor!
It is much eaiser for the PCM to trim injector pulse width down (in time in milliseconds)than it is to controll pulse width up (open longer in milliseconds) with higher pressure to boot.

03-01-2003, 02:00 AM	#5
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	If possible use a bigger injector. The larger the injector the less fuel pressure required, the less fuel pressure required the more control the injector has (PCM) over the pulse width. The processor can always lower the pulse width and control air fuel ratio eaiser at lower pressures than it can at higher pressures where the nozzle can lose control of the spray pattern and volume. Also little known fact--- the higher the pressure the LOWER the volume from the pump. The lower the pressure the HIGHER the volume from the pump. Its true! I have built 600 rwhp 4.6 Cobra's with 50 lb/hr injectors and used only 40 psi of pressure! Mind you this is with 1/2" feed line and 3/8 return and a Aeromotive A-1000 pump. And this was on a supercharged car with 18 psi boost! No FMU! Just a 1:1 regulator! Stock Processor! It is much eaiser for the PCM to trim injector pulse width down (in time in milliseconds)than it is to controll pulse width up (open longer in milliseconds) with higher pressure to boot. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!