| Author | Topic |
|---|
Location:
Canberra
Registered:
October 2002
|
|
how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 07:20
|
 |
I've had a thought. i'd like my 3sge to run on all 16 valves right from teh get go. does anybody know how to do this? i've heard its as simple as disconecting a vaccum line.
thanks in advance guys
|
|
|
Location:
Gold Coast
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 07:51
|
|
|
why do you want to do this? it is beneficial until you have a highly modded motor.
|
|
|
Location:
Canberra
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 09:57
|
|
|
To boost top end power. my engine is effectively an 18RG until 4300 rpm. plus i want to see what difference it will actually make.
|
|
|
Location:
Epping, Sydney
Registered:
April 2003
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 10:18
|
|
Yeah, I have a tvis intake manifold sitting here at home, and it seems there is a little vacuum guage that sits on the bottom controlling the little flaps that isolate the valves
As the vacuum increases, a diaphram is pulled back, which is connected to the valves, which then open.
In regards to just disconnecting something to make them stay open, I would also be interesting is seeing how that is done, as their default position is closed, and vacuum causes them to open.
And I would like to give it a burl and see what happenns with T-VIS turned off.
Rob 
|
|
|
Location:
Canberra
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 10:31
|
|
|
So i suppose it is a case of getting a new computer which you can tell when to open the valves etc. Perhaps i'll look at my haynes manual tomorrow for some more clues
|
|
|
Location:
Epping, Sydney
Registered:
April 2003
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 10:35
|
|
|
yeah maybe, or finding some way into tricking the T-VIS into staying open, other than using a bit of wire Alternately you can take it all apart and remove the T-VIS stuff alltogether. A bit drastic I feel though..
|
|
|
Location:
Canberra
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 10:48
|
|
|
Hmm, i think some non-toymods research is required. but i'll get back to you and tell you how i went
|
|
|
Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 16:35
|
|
Seriously guys, do a search as I've talked about it a fair bit (even though mine's a 4A-GE, T-VIS is T-VIS).
The T-VIS butterflies don't actually block off 1 valve per cylinder, as the first inch or so of port there's no divider. I've played around with mine heaps, as mine was never hooked up when I first got it, and having it connected & working is much better, the torque you lose at low revs with the valves always open is quite incredible.
As for adjusting the switching point, the only way to do it properly would be to tune the engine thoroughly with the valves open, & print out a power graph, then do the same with them closed, & overlay the 2 graphs & where they cross over is the best shifting point. Chances are it'll be pretty close if not spot on to what it is now.
Infact I reckon you should try disconnecting it, they are springloaded open so if you disconnect any of the vac hoses going to the controller valve under the intake manifold it'll be disconnected. Take it for a drive & then appreciate the power of T-VIS! 
|
|
|
Location:
Canberra
Registered:
August 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 22:09
|
|
18rg indeed,
im still keen to race ya benny boy!!!
and we will see exactly how faster your 3sge really is!!
lol
|
|
|
Location:
Gold Coast
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Tue, 26 August 2003 23:20
|
|
|
yeah tvis moves the tourgue curve below 3000? rpm to make a smoother curve. When i first had my st162 the tvis wasnt working and when it was fixed (replaced) the difference was amazing. like going from a 1.6 to a 2 litre down low.
|
|
|
Location:
South Australia
Registered:
July 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Wed, 27 August 2003 00:19
|
|
T-VIS is good...I wouldn't disconnect it unless you've done alot of other stuff to the engine. T-VIS increases cylinder air density at low revs (allowing more petrol to burn) and it doesn't impose much restriction on the engine when it's dis-engaged (although, it does disturb the air flow a little) so the air volume (important for high end power) isn't really decreased too much.
Just remember, you need air density at low revs, and there's some aerodynamic law stating that the faster the air moves, the less dense. (Hence why the T-VIS butterflies slow the air down at low revs).
You could try removing the t-vis butterfly valves and shaft altogether, if you want another 3 or so kW top end power, but it'll be a slow bastard off the line (being a FWD, you can't exactly do 4500 rev starts effectively unless you change the suspension and get bloody good tyres). If you simply take the vacuum hose off and leave the T-VIS permanently open, you will get 0kw more at the top end, guaranteed. You'd need to remove the shafts and butterflies etc in order to actually reduce the air flow restriction.
And yeah - you still get all valves operating with/without T-VIS.
Note : Don't disconnect the ISC vacuum hoses (they are underneath the manifold right next to the T-VIS vacuum stuff).
If I were to choose a weak point of the 3S-GE it wouldn't be the T-VIS, it'd be the engine management...it's pretty damn weak.
|
|
|
Location:
Canberra
Registered:
October 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Wed, 27 August 2003 12:32
|
|
|
True. Perhaps an aftermarket ECU is a good idea. one that can realise the full potential of teh 3SGE
|
|
|
Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
|
|
Re: how to discombooberate T-VIS on 162 3SGE?
|
Wed, 27 August 2003 18:42
|
|
|
The T-VIS actually speeds up the air flow, by restricting the intake runner volume to half the air must travel faster to fill the cylinder.
|
|
|
