At 06:37 PM 7/27/2011, Scott Daniel - Turbovans wrote: >'The only' variable is how long, in milliseconds the ecu holds the injectors >open. >( minor variation is fuel pressure, which changes slightly relative to >intake manifold vacuum ...as affect by the fuel pressure regulator ) Actually the fuel pressure is *not* a variable, since the function of the fuel pressure regulator is not to maintain a constant gauge pressure but rather a constant pressure between the fuel rail and the end of the injector (which is inside the intake manifold). Because of that the injector passes a constant amount of fuel per millisecond even though the manifold pressure varies over a range of close to 15 psi and may be varying even while the injector is open. Yours, David |
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