igzy

iTrader: (18)

Found this on Nissan website that 5th Gen (2K/2K1) owners may appreciate. It shows an animated view of how VIA/VIS operates. I just verified the link and it works well:

http://www.nissanusa.com/video/vehic...iable_inta.swf

Mods - there is a link to something that is supposed to show something similar in How-to sticky but it does not work any more...

Kevlo911

iTrader: (36)

Looks like the 2k2+ VI and not the 00 vi

igzy

iTrader: (18)

How do you figure that? 2K/2K1 VIA works on the same principle, i.e. an additional intake air passage opening at 5K RPM and sucking in more air regardless of how the sketch looks... I guess I should have stated it is for all gens >5th?

bpe383

OK so how can a 02 owner such as myself tell if the flap is opening/working?

I ask because at 5000RPM as in the demo it shows the flap opening. Which means you should feels/hear, or something different with regard to the power at that level. On my car it seems to really stop pulling hard at that point, leading me to think the flap is failing to open, and the engine starving for air. It seems as though it takes for ever to get from 4500RPM to 6000RPM. I mean forever. This is while in second gear 6spd.

Metal Maxima

iTrader: (30)

Damn, he's in 4th gear only doing 45mph after near-redlining each shift? Someones car is fuxor3d!

trigger005

iTrader: (8)

"for illustration purposes only"

Good find though, igzy

Metal Maxima

iTrader: (30)

My bad.

nismology

iTrader: (8)

Not quite. The DE-K VI is nothing like that animation in concept or execution.

igzy

iTrader: (18)

Care to explain?

On 2K/2K1 engine, air intake works almost exactly the way that the animation shows. There are two air passages in the intake of which one is closed by a flap (that is in on a rod in line with other cylinders and controlled by the actuator) when the engine runs under 5K RPM. 5K to redline the flap opens and more air enters as it goes through both passages. Now, one passage is a shorter than the other and is a shorter path than the other, but don't forget that the air can still be sucked in through both at the same time...

It is cool to see you all dispute Nissan's animation of VI operation but would be nice to read why you think it is not what they say it is...

Spin20

iTrader: (4)

Is it me or is their VIAS in the animation opening at 4500 rpm's

nismology

iTrader: (8)

There was a thread a couple years back where a couple orgers hacked open a DE-K VI and discovered that the holes that are uncovered by the power rod when the VI is activated has no inlet. They are sealed off, which only means one thing...resonance chamber. The DE-K VI works on the same principle as the MEVI, dynamic supercharging, except the resonance chamber is underneath the runners. Old news really...
This is true in a dual-runner variable intake manifold but is not the case with the MEVI/DE-K VI.
That is just ONE type of variable intake manifold, not the only one. And where in that link does it mention the VQ30DE-K motor? You just assumed there was a relation between the two.

igzy

iTrader: (18)

Cool, thanks for the educational explanation... I guess I have missed the tread on the hacking of the manifold and no open second passage...

I thought this is how VIA operated on 5th but I guess I was wrong... For me and other guys who would like to know, intake shown in the animation, what engine is it from?

nismology

iTrader: (8)

Looks like it's from the QR25DE.

http://www.sportcompactcarweb.com/te..._atunersguide/

Kevlo911

iTrader: (36)

Hehe, I guess I have no need to explain anything, nismology did all the work for me.

igzy

iTrader: (18)

Cool, thank you for information/clarifications and my apologies for misinformation

FunLovinMaxima

What's confusing is that the URL contains "/vehicles/gallery/maxima/" and yet it doesn't pertain to the Maxima... disingenuous on Nissan's part, I'd say.

nismology

iTrader: (8)

Good catch. I didn't even notice that.

igzy

iTrader: (18)

Well, that was what made me think that it was Maxima's VIS in the first place since I found it under "Maxima"... Of course it did not help that I did not read the other thread on hacking of the VIA and went on a tangent