Optra VGIS

[Kopikao]

Wish to know more how (mechanically) the VGIS works.

 

From the pic, the big red should be the whole VGIS system . Wish to know where is in or out..

 

Wish to ask..

the VGIS control is by air going through the black vacuum (on left) 1st from the intake mannifold or going throught the pump (gold dumdbell thing with a piston circled green) controlled by the seloniod at the vaccum?

 

How would the small black vacuum be important... i realise if i push the piston, air will "leak" from the soleniod from the vacuum..

Edited April 25, 2005 by Kopikao

[Cracker]

I am not sure how it works,,,but the SA supervisor told me the activation is at ard 4000 rpm. I did rev an optra auto to 4000 rpm...but dun feel any difference.

[Spango]

What is this VGIS thinggy suppose to do?

[Nerd_on_wheels]

I thougt vgis is something incorporated into the engine, so its just this black cylinder and a gold dumbell with some piping. maybe this can be a sweet spot to enhance performance

[Cracker]

this is my interpretation from his explanation...I may be wrong.

 

it is like one of those variable timing stuff....where once u hit certain rpm, there will be two opening to allow higher air intake in order to give more ooomph..

 

most likely I am wrong....anyway I doubt it can do much to move our 1.2 ton of metals.

[Kopikao]

Most likely i think is the small black vacuum, controlled by the valve soleniond at its side, (at certain rpm) would cos the the dumb bell (actuator) to close the variable intake thingy to allows more air to enter at higher rpm...

 

Was just wondering what is the small black vacuum container doing... also, notice there is a "plucked" out point (with a rubber closed tip) at the VGIS dumb bell there... Is it there for some purpose but not being used?

[Genie47]

What you are pointing out is the VGIS actuator. The black circular intake manifold is the sliding manifold.

 

Don't fiddle with it. You will lose low end if you do. The whole idea of VGIS is to provide low end torque from the longer intake length.

 

Yes, it is correct, activation is from vacuum. Remember the vac gauge discussion under Performance or Maintenance? High vac means WOT. Engine need more air so VGIS actuator slides to the shorter intake but I believe there are other factors. Low vac means almost atmospheric conditions so VGIS slides to longer intake.