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]

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]

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?:confused:

[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]

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]

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!!! :rolleyes:

[d1nzfe]

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. :wink:

[Parmas]

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

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!

[127.0.0.1]

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!

only VVT-i L is the V-TEC style with 2 cam lobes. it changes timing, lift, and duration
VVT-i L almost doubles horsepower if properly engineered.

plain old VVT-i is not Vtec. single cam lobe. it just changes timing.

[Parmas]

I don't think VVT-i as a source of power but more like smooth efficiency. Unplug the VVT-i cam plug and understand what happens. I just want to know that I have all setup right

This thread was created to get to know more on VVT-i tech and how it works aswell though.

[127.0.0.1]

I don't think VVT-i as a source of power but more like smooth efficiency. Unplug the VVT-i cam plug and understand what happens. I just want to know that I have all setup right

This thread was created to get to know more on VVT-i tech and how it works aswell though.

that is correct. not power, better torque curve on a small motor

for power... you -must- have V-tec, yo.

drop a corolla engine in there

[Parmas]

for power... you -must- have V-tec, yo.


Or VVT-Li is equivalent which is used on various new toyota engines

My mistake just recieved confirmation that ecu is capable to control VVT-i on a single vanos

Vanos definition : http://en.wikipedia.org/wiki/VANOS

[ddongbap]

Lol why would you call it Vanos?

BTW.

VVT-li is not the same thing as V-Tec. VVT-li is the similar to iVtec. But not the same.

Honda is EPIC at valve timing/adjustments. Nobody has been able to master this realm of crazyness.

[Parmas]

Lol why would you call it Vanos?


VANOS (VAriable NOckenwellen Steuerung)

[ddongbap]

I know what Vanos is. Its also from BMW, not Toyota.

My previous post, I meant:

Nobody ELSE has been able to master this realm of crazyness.

[127.0.0.1]

Lol why would you call it Vanos?

BTW.

VVT-li is not the same thing as V-Tec. VVT-li is the similar to iVtec. But not the same.

Honda is EPIC at valve timing/adjustments. Nobody has been able to master this realm of crazyness.


that is what I meant. it is the same as v-tec. and as far as no one else has been able to master this ??? ummm....well yes toyota has

[ddongbap]

that is what I meant. it is the same as v-tec. and as far as no one else has been able to master this ??? ummm....well yes toyota has

No they didn't. The VVT-Li failed, and they stopped production of it.

Vanos is NOT the same as vtec.

Valve timing adjustment is wayyyyyy different than valve lift+duration.

VVT-i = timing.

VVT-li = timing + lift/duration

VTec = lift/duration

iVTec = timing + lift/duration

Vanos = timing

[Tamago]

No they didn't. The VVT-Li failed, and they stopped production of it.

oh did they?

then what engine is in this currenty available vehicle?

http://image.motortrend.com/f/tuners/english-elegance-project-kahn-debuts-lotus-elise-tuning-program/13140980+w750/2009-lotus-elise-project-kahn.jpg

:laugh:

[spookz]

VVTL-i. =)

Tamago is right, the production of the 2ZZ-GE has been stopped for most markets, however Lotus continue to offer both the 2ZZ and the 1ZZ in their Elise and a supercharged version of the 2ZZ in their Exige.

[ddongbap]

Sorry, I should have said, Toyota stopped using that engine.

[rob323]

I just wish that the technology being used in F1 from ages ago would hurry up and get main stream. Solenoid actuated valves. Electronically adjustable lift, duration and timing, and no parasitic losses due as there are no camshaft shafts.