E85 All Motor Build - Toyota Yaris Forums

jmanous · 12-08-2015, 12:13 PM

I think the vvi solenoid is a pulse modulated (PWM aka duty cycle) valve which, in the US yaris at least, 50% duty cycle means 0 degrees, higher than 50% means advance and lower than 50% means retard.

I can't imagine how the RS solenoid would work, except the 0 degrees point of reference is
either lower or higher duty cycle than the usual 50%.

Remember these things are intelligent. The solenoid is not analog, has its own controller. CAM signal also returns the current position (angle) of the camshaft to the ECU.
So if you just alter the vvti angle, the ECU should gradually learn how to achieve
the desired settings essentially voiding your changes.

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12-08-2015, 12:13 PM	#15
jmanous Drives: Toyota Yaris Sedan 2007 Join Date: Jun 2015 Location: NJ Posts: 30	I think the vvi solenoid is a pulse modulated (PWM aka duty cycle) valve which, in the US yaris at least, 50% duty cycle means 0 degrees, higher than 50% means advance and lower than 50% means retard. I can't imagine how the RS solenoid would work, except the 0 degrees point of reference is either lower or higher duty cycle than the usual 50%. Remember these things are intelligent. The solenoid is not analog, has its own controller. CAM signal also returns the current position (angle) of the camshaft to the ECU. So if you just alter the vvti angle, the ECU should gradually learn how to achieve the desired settings essentially voiding your changes.