At what RPM VVT should be activated?

[127.0.0.1]

check it

http://www.billzilla.org/vvtvtec.htm

[Parmas]

Originally Posted by 127.0.0.1

check it

http://www.billzilla.org/vvtvtec.htm

Thanks for the link mate sure it refreshed my mind.

From what I understood in simple words...

VVT - needs signaling to operate on and off

References:

"The early VVT system was relatively simple, ie, at a specific rpm (~4400rpm on the 20 valve 4AGE's) the computer signals the OCV to open, this lets oil pressure go through a special gallery in the #1 inlet cam bearing, through the centre of the inlet cam to the VVT pulley"

"When the computer signals for the VVT to operate, the OCV opens and thus causes the VVT pulley to advance the inlet cam timing by 30°, reference the crankshaft"

Regarding VVT-i there is not much details so I assume is more or likely to operate similarly to VVT.

"Since the two different cam timing's will make different power throughout the rev range, (advanced inlet give more top end power at the expense of low end power, and vice-versa) there is a point where the power will be identical for both cam settings, and this is where the VVT is programmed to operate"

So I ask, what is the normal VVT rpm range of the 1NZFE?

Also what about VVT on turbo engines? Is there any variable cam turbo engine?