The 2zr-fe engine swap guide - Toyota Yaris Forums

MugenRep · 03-17-2016, 03:25 PM

True VTEC (there are other ECO Vtecs now) has 3 lobe intake and/or exhaust cams that operate via a VTEC solenoid operated by raising oil pressure and the vehicles ECU to switch between a low lobe lift/duration initally and then a secondary lobe which has little more, and then to one that has very aggressive rates for life/duration. Modern I-VTEC also control timing on the intake cam via VTC in addition to the more aggresive intake/exhaust cams as revs rise.

If you ever go to a meet or show and see a loud high idle Honda, they're usually running a "VTEC KILLER" which is eliminiting the lost motion system which allows the lobes to change and just running the 3rd lobe which is hte most agressive. They dont' idle right under normal idle conditions because the cam profiles are too big.

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03-17-2016, 03:25 PM	#11
MugenRep iQ innovator & researcher Drives: 2012 iQ Join Date: Mar 2016 Location: Central Pennsylvania Posts: 199	True VTEC (there are other ECO Vtecs now) has 3 lobe intake and/or exhaust cams that operate via a VTEC solenoid operated by raising oil pressure and the vehicles ECU to switch between a low lobe lift/duration initally and then a secondary lobe which has little more, and then to one that has very aggressive rates for life/duration. Modern I-VTEC also control timing on the intake cam via VTC in addition to the more aggresive intake/exhaust cams as revs rise. If you ever go to a meet or show and see a loud high idle Honda, they're usually running a "VTEC KILLER" which is eliminiting the lost motion system which allows the lobes to change and just running the 3rd lobe which is hte most agressive. They dont' idle right under normal idle conditions because the cam profiles are too big.