There has been much talk of feeling the vvt kick in on the 172...
fact.. you dont
I just went out and tested my theory.. hooked up a dvm to the vvt actuator in the head, and heres the results..
VVT *Varaible valve timing* is actuated at 1200 rpm !!!.. it is then on al the way to redline..
the only time it is off is on idle, on *very* light throttle, and on over-run..
the mechanism used by renault is a phase shifting device on the inlet cam only.
A solenoid plunger in the head casting allows oil pressure to be fed to the phase shift unit.. this effectively increases advances the inlet cam timing.
there is NO VARIATION.. it is actuated, or not actuated.. ie.. full on, or full off.
so.. now you know.. what you feel at 5k is PURELY the cam coming on.. nothing more.. you cannot even feel the vvt when it actuates.. it is there for a slight torque increase during acceleration (From 1200 rpm).. and off at idle to make the idle smoother and reduce emmisions.. same on very light throttle and over-un..
another myth dispelled..