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clarification of MS1 Extra Tuning Manual
the manual says....
Setting the PWM Criteria I am using Delphi 525 EV6 injectors, these measure 12 ohms; therefore they are high impedance injectors.To tune the PWM [pulse width modulation] values for your engine, you need to know what kind of injectors you have: low impedance or high impedance. If you are running high-impedance injectors (greater than 10 Ohms), then set the: PWM Time Threshold to 25.4 msec, and the PWM Current Limit (%) to 100%. In essence you are disabling the PWM mode. This allows full voltage to the injectors throughout the pulse widths. If I set my PWM current limit to 100% and my PWM time threshold to 25.4 msec then I effectively disable PWM mode and cannot use it for idle control? Is this correct, I cannot use PWM for idle control when using high impedence injectors? |
The PWM or DC (Duty Cycle) we use for idle control is a signal to the idle air control valve (i.e, the air leak). The fuel injectors work the same way at idle as they do everywhere else on the VE map. Basically, Req. Fuel x VE x Gains = Injector Pulse Width (at full vultage for high-impedance injectors).
So, relax . . . it'll work. |
Also, anyone know the opening time for Delphi 525s? [currently using 1.2 msec, Google shows MSD 525's at .61 msec@13v with a correction value of .14msec/v]
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