Basically, our VTC system is
>an adjustable cam gear, that is controlled by the computer, right Ken?
Yep, the ECU takes into account all of the above.
Coolant temp,engine RPM,amount of air intake,throttle position,vehicle
speed,and gear position[ on a auto I suppose] to determine the intake valve
timing.
The VTC or valve timing control operates under these conditions.
The engine has to be running,coolant temp has to be 158F or more,the load on
the engine must be high,and the RPMs must be between 1500RPM and 4300RPM. If
this is the case, the VTC valve is activated and the valve timing is
advanced and valve overlap is also advanced. The major thing about VTC is
that if you look at the torque curve of the GA16de engine with VTC activated
and NOT, peak torque occurs much earlier with the VTC in effect.
Not bad for a car that some people have refered to as a SHOEBOX.
Ken
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