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Message: [QUOTE="Charles, post: 1325409, member: 103"] The pw at the bottom of the map has more to do with what happens when you place your foot back on the pedal. Get it too high and the truck will snap and break your neck plus the cruise will be a nightmare and if it's high enough the truck won't come down to idle. Get it too low and the bottom of the pedal will be dead. This is with a normal looking MFD table. And the [i]highest[/i] pw you can run at idle will usually yield the smoothest running engine. Lower ICP and higher pw is smoother. Long, casual injection event. When the duration shortens up the pressure has to increase to achieve the needed fuel quantity, which means a short, abrupt event. Since being on the ragged edge of the needed pw to fire the injector means some will fire and others may not consistently fire. That leads to a rough idle, because it's literally missing. Plus, the cylinders that are firing, have a short, high velocity spray that leads to a harsh event. If you looked at it on a cylinder pressure transducer readout on a scope you would see the higher pressure, shorter duration event basically freezing the cylinder when it happened. Pressure dips a LOT, then it slams back up hard when the shot of fuel pops. A lower pressure, longer event dips much less (because the cold fuel is introduced slowly) and then pops back up much softer, because the fuel is introduced slower. For low power.....(doesn't get any lower than idle) you want a slow, smooth event. Lower pressure, higher duration. The stopping point is when either A... the ICP won't fire the injector or B.... the truck is hazing unacceptably. [/QUOTE]

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