6G Celicas Forums

Ok, so I just found out that VVT-i was like dual variable valve timing for HP and TQ. So anyone know how this is beneficial or worse in let's say a 3sgte engine? As I am aware there is a 4th gen engine that has this VVT-i technology (I think).

(I had made a n00b out of myself with the original posting, so I made this thread up to make up for it in another n00bish fashion, but with more to gain from it than my original thread, so my bad.)

This post has been edited by Random_Stranger: Dec 28, 2009 - 6:58 AM

It helps in creating the most efficient timing over the entire RPM range.

http://www.etoyotaindia.com/flashpopup/vvti.htm

This post has been edited by Supersprynt: Dec 28, 2009 - 5:11 PM

Actually the 4th gen 3sgte that came in caldina st215 does not have vvt-i.

4th gen 3sgte Specs from what I know:

-Air to Air Intercooler
-Better designed intake manifold
-No distributor (4 individual coil on plug)

thats about all I know. Only the 3sge beams redtop has vvt-i on the intake manifold, which Im sure you aware of.

^^What he said. Only the BEAMS 3sge had VVT-i in the 6th gens.

Then is it true that the black top Beams engine ran the Dual VVT-i?

Yes, the black-top Altezza beams had dual (intake & exhaust) vvti.

As i understand it, variable valve timing is more about emmisions and economy than it is performance......

Oh ok, cool thanks




Oh, so that's why nobody really likes it then. But don't they still produce more TQ than Vtec engines?

They help overall efficiency. Power, fuel economy, emissions. There's not a whole lot of power to be gained. VTEC is essentially the same thing. Both are timing controllers.

Oh ok, but don't all variable valve timing on engine by different make have essentially a specific design that separates them? I am certain most of you are saying "Faust! Read on it foo!" but this is just for discussion sake. Because as I said, I failed big time on the original thread and so I just put this up instead. Otherwise I would have just deleted this thread if I had the ability to.

Like, for instance, if VVT-i were included in a newer 3sgte engine, would anyone be interested in that? Just going off of what they know about the 3sgte, and what they know about VVT-i and it's properties.

This post has been edited by Random_Stranger: Dec 28, 2009 - 7:04 PM

I would be quite interested if they ever came out with an updated version of 3sgte .

They're not exactly the same, but they are the same concept. VVTi is now VVTLi - which includes lift and can be found on most Toyota motors.

Oh ok, and those are "Dual", yes?

that is not entirely true.

vvti is only for emissions on the eco box motors aka 1zfe.

But once you get into the IS-F engine, you will get vvt for horse power.

vvti doesn't really help with turbo charge engines because under boost the air restriction bottle neck would be lessened. VVTi was orginally created to help all motor engine breath better while maintaining torque. This is the same reason why you dont see motorcycle engines with vvti. They don't need torque so everything part of that engine can be geared towards reving up and making a ton of horse power.

Reving a turbo charge engine that high is simply not a good idea.

To really beat a dead horse, vvt was design for all motor engines to shift the power band higher into the RPM range with out the consequences of no torque, bad idle, bad fuel economy.

Everything needs more torque

Nah, just playing. But seriously, this thread is a good read. I thought VVT was good for both more power and improved efficiency, not just one or the other. I am getting a good education from you guys.

did you hear about the tom's tuned altezza came out blacktop VVTi 3S-GE+T , only 100 where made (came out with heaps of toms stuff like ecu airfilter suspension exhaust and among other things) there is also a 3S-GZE (blitz supecharger)

or the updated 1jzgte (vvti turbo) or 2jz-gte (vvti turbo)

Sweet find! Any specs?

acually the IS-F has vvtli so it controlls lift allowing it to reach higher rpms due to increased valve lash. the 1zz uses vvti and the 2zz (found in 7th gen GT-S celicas) have vvtli, that is why you hear them say "I'm hittin lift"(worse saying ever). BUT none of this is useful without high compression ie the 1zz and 2zz have 10.5/11.5to1 comp. and the 4age 20v came with vvt(vacuum opp.) also high comp.

i was just generalizing variable valve timing and wrapping up the entire valve timing in a short phrase of vvt; because what i said applies to vtechi and nvcs and what ever those crazy manufactures want to call it.

vvt is some fancy technology. nissan's nvcs variable valve timing was able to use the valves it self to control the engine removing the need for a throttle body.

This post has been edited by Hanyo: Dec 30, 2009 - 4:05 AM