When exactly does VVTi kick in?

[fourbangingfun]

2007 Yaris sedan here. I was just wondering at what rpm this feature kicked in. Also, does it give more power or simply save us fuel?


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[IllusionX]

VVT is always active for best fuel efficiency.

It's not like Honda VTAAAKK.

[fourbangingfun]

VVT is always active for best fuel efficiency.

It's not like Honda VTAAAKK.


Ah I see. I had no idea


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[bronsin]

And certainly not like the Ford YAPYAPAAAP!

[jcboy]

VVT is always active for best fuel efficiency.

It's not like Honda VTAAAKK.

+1.

here's how the cam timing works.
pictures speak a thousand words.

http://img.photobucket.com/albums/v229/TTJ/VVTOperation.jpg

[aspro]

I think all valves open up at around 33-3500 rpm.

[fourbangingfun]

+1.



here's how the cam timing works.

pictures speak a thousand words.



http://img.photobucket.com/albums/v229/TTJ/VVTOperation.jpg


That is awesome. I don't really understand the images though.. Like the white and black semi circles and what they represent. I'll have to do some additional research and self-learn a thing or two about valve timing.

Thanks for the post!


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[jcboy]

those are the cam shafts of the intake (IN) with respect to the exhaust (EX). Imagine you are viewing the engine from the side (the 3 pistons blocked from your view by the piston closest to you)

Both of them in reference to 0degrees of timing or TDC (top dead center).

[CrankyOldMan]

Funny, I thought it kicked in at 4k rpm, since that's where the power band starts. Something new every day, eh?

[MattS.]

And I thought VVTI meant " Very Very Tiny Injun"... :wink: