TVIS?

[TRDPWR]

ok i have no idea how this would work. if it would work, and if it did whether or not it would be worth it but.....

i was around at a mates today who has a gen2 3sgte with tvis
then i looked at my engine sitting next to it a gen3 no tvis

i was wondering if i could put a tvis manifold on my gen3

if i could what advantages would this give me

also its a gen3 WRC not sure if that makes much difference

[Alex B]

3sgte's dont have vvti....at all.

[TRDPWR]

sorry i meant tvis. im half asleep lol

[Alex B]

You dont want it.

[TRDPWR]

thread edited

[Adamal]

First off, the 3SGTE never had VVT-i. Second, its nothing to do with the manifold, its the actual cam shaft(s). Third, fitting a VVT-i system to an engine that never had it would be an absolute nightmare. It's ECU controlled for starters, so unless you're going for an aftermarket ECU that supports it, you'd have to go with an N/A one from either a Redtop 3SGE or a Blacktop 3SGE, and it wouldn't take too kindly to lower compression and boost.

Are you sure you're not getting mixed up with TVIS? Because that sounds more logical, and no, it would be pointless to do on a Gen 3 motor.

[Alex B]

And now it sucks he wasnt meaning vvti

[Adamal]

With my thread and yours as evidence, people will know the truth

[TRDPWR]

lol common i was asleep i did mean tvis

[groupagt4]

tvis or toyota varaible intake system just gives you a little more low down torque and opens it up on high rpm.if i was you i wouldnt bother theres a reason toyota didnt feel the need to put it in a gen3 3sgte

[TRDPWR]

whats that reason?

[groupagt4]

they probably got enough low down torque achieved through the newer turbo and tvis is just a fad to sell the cars back then

[TRDPWR]

so even in a race car that little bit extra is not worth it?

[groupagt4]

here something i found on the net

So why did Toyota do away with T-VIS?

My guess is it that they designed better intake manifolds which close the gap between the two curves. If you notice the power differences on later (non TVIS) engines better designs created more power. (This makes sense when you remember that the T-VIS butterfly is an obstruction in the intake manifold).

Many TVIS equiped cars also had reliability problems. The T-VIS butterfly has been known to stick closed, and/or the vacuum operating the T-VIS butterfly can malfunction.

[Quint]

Yea, TVIS sucks, stay awaaaaaaay

[Akane]

The hearsay about TVIS is that Toyota was in the era of "bigger is better" when they designed the 3S-GTE, the gen 2 3S-GTE (ST185) had HUGE ports, but bigger does not mean better, it caused a lot of loss of torque down low (can ya say air velocity?), so Toyota jimmy'd up some T-VIS plates to block off 1/2 of the intake runners to increase air velocity, which helped torque.

If you are not shooting for anything over the 400rwhp mark, I advise you to keep your T-VIS, it's your friend.

The Gen 3 actually has smaller ports (this is like the blue top 4AGE and red top 4AGE), it's smaller, but no T-VIS.

welcome to correct me if I'm wrong

[Quint]

Yea 4ages have differant sized ports, hence big and small port

Akane is right, at low down RPM cause all the air is only going through 1 (or 1/2, theres 2 runners to each cyl on a TVIS) of the runners, then it opens up once you've reached a certain RPM and your vehicle requires more of the O2 and the other opens up. At high rpm its not as good, cause u've got shit in the airs path.

To see what your car behaves like without TVIS, unplug the acuator (should be under the manifold somewhere) and plug the hose up with a screw, will mean your TVIS is on the perminatly off.

I did this with my 1G found my boost built quicker, but on hills i was juggling gears alot more.