At what RPM VVT should be activated?

[Parmas]

For who don't know I am full standalone engine management and I have the grace to set the VVT to engage and disengage at whatever RPM it needs.
The only thing I know for sure is that when VVT activates it needs more extra fuel to work properly

The VVT is connected with General Purpose output 1 as shown in the picture. For now it is set to be ON @ 3525rpm and OFF @ 6712rpm. It also have DC ON option but still don't know much on that for now.


So as the title says At what RPM VVT should be activated? Why and what I need to know before I play much with this?

[Tamago]

vvti is NOT an on-off switch. it's continuously variable from idle to redline.

leave it alone ;)

[Parmas]

Originally Posted by Tamago

vvti is NOT an on-off switch. it's continuously variable from idle to redline.

leave it alone ;)

Could you make me understand more regarding VVTi?

Why the tuner set it above 3K and not from 1K so?

[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?

[JayTee09]

the only toyota vvt turbos That I'm Aware Of was the late 1jz and possibly the 3sgte, I would start there, specificly the 3sgte, it was in the lexus IS250

[lilredrocket]

There is VVT and VVT-I the "I" stands for intelligence meaning it varies it's self throught out all RPM's through its controller/computer it's not an on/off thing or set to engage at any certian RPM

[Parmas]

What do you think about VVT-i setting up Garm? You are standalone aswell right?

[AlexNet0]

Originally Posted by lilredrocket

There is VVT and VVT-I the "I" stands for intelligence meaning it varies it's self throught out all RPM's through its controller/computer it's not an on/off thing or set to engage at any certian RPM

he is full standalone though.

[AlexNet0]

yes, however it needs to be controlled variably, not on/off, and since he is full standalone, he needs to find another way to do it, since that function was of the ECU that he no longer has.

[lilredrocket]

His actually had to be programed for VVT-i because his did not come compatable with it so he took it to the manufacture to get it done

[kustom play]

Originally Posted by JayTee09

the only toyota vvt turbos That I'm Aware Of was the late 1jz and possibly the 3sgte, I would start there, specificly the 3sgte, it was in the lexus IS250

3sgte was in the old MR2s and celica altracs not the 250

BEAMS was the only 3s based engine with vvt-i and it was a non turbo engine....

[chongopants]

are you using a chip? what are you programming? Hows does that work? I am very interested.. please let me know.

[Parmas]

Well I found out that probably the ecu is only capable to control VVT not with intelligence but still to check about it.

Also there is a VVT tuning map accordingly....

[Tamago]

imagine that, you figured out what i told you in post two!!!

[d1nzfe]

Originally Posted by Parmas

Well I found out that probably the ecu is only capable to control VVT not with intelligence but still to check about it.

Also there is a VVT tuning map accordingly....

can u put up a review on this GoTech PRO X? I'm interested in it.

[Parmas]

Originally Posted by Tamago

imagine that, you figured out what i told you in post two!!!

Well post 2 was a like leave it alone and not you don't have control of it... although here we are in a forum and I would expect some help to solve problems either than let all go (from an "expert" like you tamago)

RE: d1nzfe .. I would be making a review as soon as all issues are solved etc...

[jouna]

i know some crazy yaris mo fo's and they think the vvt-i is like a vtec and they put the vvti to turn on with a button and it actually gives them 6 whp can somebody explain dis shit!