1UZ: advancing the intake cam does 'what' to the exhaust cam... ??

[3sgte]

The fact they use the word "duty" in that text means it does use PWM.
Thanks for the diagram.

I tend to be kind of retentive. I don't like to make direct statements of fact unless I have firsthand knowledge or experience.

What I would dearly love to watch is some duty data, and relate it to the cam movement that it creates.
Imagining or picturing the relationships is fine, but watching them using data is one step better.

[ed]

when i get the sm4 tuned for the VVTi ill update with the actual numbers if you like - will be a while though

[MWP]

I tend to be kind of retentive. I don't like to make direct statements of fact unless I have firsthand knowledge or experience.
What I would dearly love to watch is some duty data, and relate it to the cam movement that it creates.
Imagining or picturing the relationships is fine, but watching them using data is one step better.

"duty data" would be a percentage which then translates into a PWM signal.
From the simplicity of the valve design, the PWM duty compared to valve position and hence cam position would be linear.
Ie, 100% = full advance, 0% = full retard, 50% = center.
It would be quite easy to work with.

BTW, im only thinking about all this as i want to design & build my own engine ECU at one point in the future.
Im sure the higher end aftermarket ECUs make VVTi control pretty simple.

[FWD_Rolla]

does anyone know of a 3uz engine manual online??

cheers
ed

http://techdoc.lexus-europe.com/xcvr...nts/index.html