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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Disabling TVIS
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Sun, 07 November 2004 06:47
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i just got a pair of cams in and i was wondering if there is a way to keep my TVIS constantly open?? I dont want to remove, just activated (open) all the time.
I understand there is a switch somewhere to operate the tvis. Does it receive 12V current to open or close tvis??
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Location:
Canberra
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 07:37
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Hi mate, the 4AGE TVIS is spring loaded to the open position. 
Without going into electrics, the simple way to de-activate TVIS, would be to bypass the vacuum lines, and disconnect the electrical connection at the Vacuum servo Valve (VSV). If you ever want to reconnect TVIS, just reconnect vacuum hoses and electrical connection.
regards Chuck.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 07:45
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Hmms the ones off my other motor were springloaded closed - or is this only under no vaccum/power
if not - youd only ever have 4 of the 8 runners open
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Disabling TVIS
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Sun, 07 November 2004 08:00
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well... if TVIS uses vacuum to operate, it can only be operated when throttle is closed, since at any decent throttle, there will be no vacuum.
if it were spring loaded closed, when you are at WOT = no vacuum = closed TVIS.
they MUST be springloaded open, as it won't work otherwise...
Cya, Stewart
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Location:
NSW, East Coast
Registered:
July 2003
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Re: Disabling TVIS
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Sun, 07 November 2004 09:15
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| oldcorollas wrote on Sun, 07 November 2004 19:00 |
well... if TVIS uses vacuum to operate, it can only be operated when throttle is closed, since at any decent throttle, there will be no vacuum.
if it were spring loaded closed, when you are at WOT = no vacuum = closed TVIS.
they MUST be springloaded open, as it won't work otherwise...
Cya, Stewart
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When i had my motor apart for a rebuild i noticed my tvis was spring loaded closed.
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Location:
Vic
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 10:09
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They are spring loaded open & vacuum closes them.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 10:19
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Hmms will double check * rummage thru parts heap *
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Location:
Carlingford, Sydney
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 10:23
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im 90% sure mine where shut all the time
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Location:
Canberra
Registered:
May 2002
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Re: Disabling TVIS
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Sun, 07 November 2004 10:58
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Conjecture and supposition will get you nowhere.
Before posting my reply, I physically checked 2 spare TVIS assemblies. I repeat for all the doubting Thomas's the TVIS butterflies are spring loaded open.
As stewart has aptly pointed out, they are closed by vacuum, at WOT there is little or no vacuum, hence the butterflies will be open.
regards Chuck.
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Location:
Adelaide
Registered:
August 2003
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Re: Disabling TVIS
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Sun, 07 November 2004 11:00
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What size cams? And tell us how they run on stock computer (I assume)
You can get plates which replace the whole TVIS setup from T3, this might be a better option?
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Sun, 07 November 2004 11:01
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| ChuckLandwehr wrote on Sun, 07 November 2004 18:37 |
Hi mate, the 4AGE TVIS is spring loaded to the open position.
Without going into electrics, the simple way to de-activate TVIS, would be to bypass the vacuum lines, and disconnect the electrical connection at the Vacuum servo Valve (VSV). If you ever want to reconnect TVIS, just reconnect vacuum hoses and electrical connection.
regards Chuck.
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which hoses exactly? Where is the VSV connection exactly???
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Sun, 07 November 2004 11:03
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| Skaney wrote on Sun, 07 November 2004 22:00 |
What size cams? And tell us how they run on stock computer (I assume)
You can get plates which replace the whole TVIS setup from T3, this might be a better option?
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wade cams 267 degree mate. I just want to see how it goes with TVIS opened b4 doing anything permanent to tvis
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Location:
Sydney
Registered:
September 2004
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Re: Disabling TVIS
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Mon, 08 November 2004 01:40
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Everyone is right in that the TVIS butterfly is spring loaded open. However it is managed by a vacuum tank that is connected between the TVIS actuator and the manifold.
this tank has a one way valve on the inlet side which shuts as manifold vacuum decreases therefore maintaining a constant vacuum to the actuator.
Between the vacuum tank and the actuator is the TVIS VSV, once engine speed of between 4000 and 4500 rpm (depending on engine load) is reached the VSV allows atmospheric air to enter the system between the tank and the actuator causing the spring loaded butterflies to open.
This is necessary as manifold vacuum fluctuates and becomes nonexistent once boost pressure is reached. Therefore this system is deisgned to have the butterflies closed under 4500rpm and open above 4500rpm regardless of manifold pressure.
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Location:
Canberra
Registered:
May 2002
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Re: Disabling TVIS
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Mon, 08 November 2004 01:49
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The vacuum lines you are looking for are under the inlet manifold, the VSV is adjacent to a small vacuum canister.
The vacuum path is as follows:
Vacuum is applied from a port on the No4 cyl section of the TVIS plate.
which feeds the vaccum cannister,
from the vacuum cannister, to the VSV,
from the VSV to the TVIS actuator.
Disconnect the line that runs to the vacuum cannister from the TVIS plate, plug the line, and you have disconnected vacuum from the TVIS system.
regards Chuck.
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Mon, 08 November 2004 04:23
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| ChuckLandwehr wrote on Mon, 08 November 2004 12:49 |
Disconnect the line that runs to the vacuum cannister from the TVIS plate, plug the line, and you have disconnected vacuum from the TVIS system.
regards Chuck.
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do i have to cover the canister outlet??
So i just disc. vacuum lines and cover it? Dont have to join vacuum lines??
Also, is the TVIS electronically controlled in anyway? Doesnt the engine throw lots of fuel in when TVIS opens at 4500 rpm or so??
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Location:
Canberra
Registered:
May 2002
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Re: Disabling TVIS
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Mon, 08 November 2004 06:51
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Tis a wise idea to cover/plug any vacuum lines which have been removed. Alternate suggestion, remove hose fit ball bearing of appropriate size in hose and re-connect hose.
The VSV is the only electrically operated part of the TVIS system. The VSV directs vacuum to the TVIS diaphragm or not. This will happen at an rpm determined by the ECU.
The ECU will sense an increase in air volume, and add fuel accordingly, this applies whether the engine is AFM, MAF, or MAP sensed.
regards Chuck.
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Location:
Vic
Registered:
May 2002
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Re: Disabling TVIS
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Mon, 08 November 2004 11:12
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just unplug the electrical connector.
Much easier than blocking vacuum lines
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Mon, 08 November 2004 12:57
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| bmak wrote on Mon, 08 November 2004 22:12 |
just unplug the electrical connector.
Much easier than blocking vacuum lines
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EXACTLY what i was looking for!!! Where/which is the connector??
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Wed, 10 November 2004 04:23
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where/which electrical connector?
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Location:
Sydney
Registered:
September 2004
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Re: Disabling TVIS
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Wed, 10 November 2004 07:47
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If you unplug the electrical connector the TVIS will NOT open about 4500rpm.....
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Location:
Perth WA
Registered:
December 2003
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Re: Disabling TVIS
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Wed, 10 November 2004 11:03
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you could wire them open, they are sprung to close...
OR you could just remove it.. the onyl reaon why peopel use them with the std manifold is cos they cant figure out you need to change the studs on the head for shorter ones, or use lots of washers on the other side of the intake manifold after you remove it...
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Location:
Sydney
Registered:
September 2004
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Re: Disabling TVIS
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Thu, 11 November 2004 01:40
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| ChuckLandwehr wrote on Mon, 08 November 2004 12:49 |
The vacuum lines you are looking for are under the inlet manifold, the VSV is adjacent to a small vacuum canister.
The vacuum path is as follows:
Vacuum is applied from a port on the No4 cyl section of the TVIS plate.
which feeds the vaccum cannister,
from the vacuum cannister, to the VSV,
from the VSV to the TVIS actuator.
Disconnect the line that runs to the vacuum cannister from the TVIS plate, plug the line, and you have disconnected vacuum from the TVIS system.
regards Chuck.
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b1gb3n, ChuckLandwehr is the only person in here that outlines successfully disabling your TVIS so that it remains OPEN and the intake system remains airtight. The only thing i would ad is the 'ball bearing' idea he mentioned earlier would be the easiest and most effective method of disabling the system.
The TVIS is NOT, I REPEAT NOT sprung to close, it is spring loaded open, and closes under engine vacuum. The vacuum canister makes sure that a constant vacuum is applied to the system regardless of manifold pressure. See my earlier post that outlines the operation of the system. I have done extensive research, and have first hand knowledge of replacing, installing and testing of the system.
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Location:
Melbourne
Registered:
October 2003
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Re: Disabling TVIS
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Thu, 11 November 2004 02:18
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I read up on Billzillas site that tvis is worth keeping on till about 180-190hp.... I heard the cars run really rough with the tvis always open too, a friend tried it on his 3sge st162, it ran really rough and bogged down...
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Disabling TVIS
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Thu, 11 November 2004 04:28
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| TRD-ST162 wrote on Thu, 11 November 2004 13:18 |
I read up on Billzillas site that tvis is worth keeping on till about 180-190hp.... I heard the cars run really rough with the tvis always open too, a friend tried it on his 3sge st162, it ran really rough and bogged down...
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the reason im giving it a try is because bill sherwood mentions that it is beneficial to remove TVIS with cam profiles around 264 or 270 upwards. cant remember exact figure.
Anyway, i figured mine is around that figure so i'll give it a try.
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Location:
uk england
Registered:
April 2005
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Re: Disabling TVIS
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Tue, 05 April 2005 18:00
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any ideas on a plate to replace the tvis plate?
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Location:
uk england
Registered:
April 2005
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Re: Disabling TVIS
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Tue, 05 April 2005 18:00
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any ideas on a plate to replace the tvis plate?
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Location:
uk england
Registered:
April 2005
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Re: Disabling TVIS
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Tue, 05 April 2005 18:00
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any ideas on a plate to replace the tvis plate?
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I supported Toymods
Location:
Perth
Registered:
October 2003
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Re: Disabling TVIS
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Tue, 05 April 2005 22:52
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Why post 3 times ? The best thing to do would get another tvis plate, dismantel it, and get the holes from where the butterfly swivels on its axel welded shut, then you can just use it as adapter plate, i wouldnt just but the manfifold up to head. I think DiZ tryed it on his 4agze and got manifold leaks.
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Location:
Epping, Sydney
Registered:
April 2003
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Re: Disabling TVIS
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Tue, 05 April 2005 22:54
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lol, is their an echo in here?
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Location:
uk england
Registered:
April 2005
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Re: Disabling TVIS
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Tue, 05 April 2005 22:59
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sorry guys, wasn't aware i had posted 3 times...exscuse me im new 
thanks for the reply though.
i have removed the butterflies and welded it up but have seen on the nest a good resin plate that elimantes the tvis plate all together.
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Location:
Epping, Sydney
Registered:
April 2003
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Re: Disabling TVIS
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Tue, 05 April 2005 23:00
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no worries! 
so do you have it running with no TVIS now?
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Location:
uk england
Registered:
April 2005
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Re: Disabling TVIS
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Wed, 06 April 2005 07:14
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hi, my current engine , GEN 1, is running with butterflies still in there but the vac line pulled to leave them open all the time.
i wausing a tvis activation adjuster to lower the point in which they opened and had some good figures from the car.
im enquiring for the next engine and what to do with the tvis...bigger turbo etc so i will no longer require tvis.
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Location:
NSW Engadine
Registered:
June 2003
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