Benefits of going VVT-i? Options

[Random_Stranger]

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

[Hanyo]

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

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.

[hatchy_gt-s]

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

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.

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.

[Hanyo]

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

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.

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