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Old 10-02-2014, 08:52 PM   #1
fourbangingfun
 
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When exactly does VVTi kick in?

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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Old 10-02-2014, 10:35 PM   #2
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When exactly does VVTi kick in?

VVT is always active for best fuel efficiency.

It's not like Honda VTAAAKK.
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Old 10-03-2014, 08:10 AM   #3
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Quote:
Originally Posted by IllusionX View Post
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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Old 10-03-2014, 11:28 AM   #4
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And certainly not like the Ford YAPYAPAAAP!
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Old 10-03-2014, 12:59 PM   #5
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Quote:
Originally Posted by IllusionX View Post
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.

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Old 10-03-2014, 01:07 PM   #6
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I think all valves open up at around 33-3500 rpm.
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Old 10-03-2014, 03:34 PM   #7
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Quote:
Originally Posted by jcboy View Post
+1.



here's how the cam timing works.

pictures speak a thousand words.




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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Old 10-03-2014, 04:57 PM   #8
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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).
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Old 10-03-2014, 08:12 PM   #9
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Funny, I thought it kicked in at 4k rpm, since that's where the power band starts. Something new every day, eh?
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Old 10-04-2014, 10:54 PM   #10
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And I thought VVTI meant " Very Very Tiny Injun"...
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