VQ35 VIAS question
10-26-2006, 04:38 AM
#1
VQ35 VIAS question
Hey guys, Just wondering what would happen if you forced the VIAS actuator to stay open. Or should I say force the butterfly open which is actuated by the vias to stay open? Would there be any gains or losses?
10-26-2006, 04:59 AM
#3
ok, but are there any power gains? I have a second upper plenum and I have been thinking about just removing the butterfly completely, but if it isn't going to do anything its a big waste of time.
10-26-2006, 05:32 AM
#4
There would be losses, absolutely no gains.
http://forums.maxima.org/showpost.ph...40&postcount=6
Pay no attention to the lower squiggly green or blue curves.
Red and Blue lines = VIAS connected, VIAS not connected.
http://forums.maxima.org/showpost.ph...3&postcount=17
http://forums.maxima.org/showpost.ph...40&postcount=6
Pay no attention to the lower squiggly green or blue curves.
Red and Blue lines = VIAS connected, VIAS not connected.
http://forums.maxima.org/showpost.ph...3&postcount=17
.. 
10-26-2006, 06:23 AM
#7
Originally Posted by knight_yyz
Hey guys, Just wondering what would happen if you forced the VIAS actuator to stay open. Or should I say force the butterfly open which is actuated by the vias to stay open? Would there be any gains or losses?
http://forums.maxima.org/showthread.php?threadid=116808
On a 4th Gen VQ35, results are a bit different. Needless to say, results are very dependent on supporting modifications.
In my case:
Blue line: Stock with y-pipe and JWT ECU
Green: VIAS Open all the time
Red: VIAS Closed all the time
As you can tell, major difference, and my very own three stage VIAS. For optimal results, close from idle to 4000, open from 4000-5800, and close from 5800-7000.
10-26-2006, 02:08 PM
#8
Originally Posted by meximax
On a 5th Gen VQ35, here is good story for you:
http://forums.maxima.org/showthread.php?threadid=116808
On a 4th Gen VQ35, results are a bit different. Needless to say, results are very dependent on supporting modifications.
In my case:
Blue line: Stock with y-pipe and JWT ECU
Green: VIAS Open all the time
Red: VIAS Closed all the time
As you can tell, major difference, and my very own three stage VIAS. For optimal results, close from idle to 4000, open from 4000-5800, and close from 5800-7000.
http://forums.maxima.org/showthread.php?threadid=116808
On a 4th Gen VQ35, results are a bit different. Needless to say, results are very dependent on supporting modifications.
In my case:
Blue line: Stock with y-pipe and JWT ECU
Green: VIAS Open all the time
Red: VIAS Closed all the time
As you can tell, major difference, and my very own three stage VIAS. For optimal results, close from idle to 4000, open from 4000-5800, and close from 5800-7000.
Wouldnt you want it the other way Open from idle to 4000, closed 4000-5800, and then open from 5800-7000. It looks like the other way that you said is lower numbers.
10-26-2006, 03:49 PM
#10
Originally Posted by knight_yyz
Hey guys, Just wondering what would happen if you forced the VIAS actuator to stay open. Or should I say force the butterfly open which is actuated by the vias to stay open? Would there be any gains or losses?
10-27-2006, 02:28 AM
#11
Originally Posted by SonicDust187
But isn't removing the valves part of the intake what SR20DEN modification to the manifold?
so I may only have it half right.
Originally Posted by meximax
On a 4th Gen VQ35, results are a bit different. Needless to say, results are very dependent on supporting modifications.
10-27-2006, 04:38 AM
#12
I thought the butterfly was closed until around the 5k mark and then it opened up for more air flow. I was wondering what would happen if you had the full flow at under the 5k mark. So you are saying it is the other way around? That you have full flow until 5k at which the butterfly closes?
10-27-2006, 06:32 AM
#14
Originally Posted by knight_yyz
I thought the butterfly was closed until around the 5k mark and then it opened up for more air flow. I was wondering what would happen if you had the full flow at under the 5k mark. So you are saying it is the other way around? That you have full flow until 5k at which the butterfly closes?
On this IM, the power valve is open up to 1800 rpm and again above 3600 rpm. It is closed between 1800 to 3600 rpm.
http://forums.maxima.org/showthread.php?t=496131
http://forums.maxima.org/showthread.php?t=488390
10-27-2006, 04:31 PM
#16
ok, got it now. I didn't realize it was opened then closed then opened. I bought a second upper plenum so that I could port match and possibly ceramic coat and I noticed the power valve, but since it isn't hooked to vacuum it appears that it would stay closed until a significant vacuum occured, at which point it would seem to open. Thanks for the info.
10-27-2006, 05:47 PM
#17
Originally Posted by knight_yyz
I bought a second upper plenum so that I could port match and possibly ceramic coat
What are you doing with the upper plenum? Port matching? Port matching to what? Did you mean extrude/honing?
If you are e/h then port maching the plenum wont do much, since you are making the plenum ports larger, therefore---> You will need to port match the lower IM and possibly even the heads.
Also, what will ceramic coating the plenum do
The pleunum isn't subdued to extreme heat to the point where it would require any ceramic 'doings'. The only benfit would be smoother materiel, but that could be done by e/h, so in short, there wouldn't be any benfit, and of there is, please enligtnen me. 
10-28-2006, 05:03 AM
#18
i am going to have headers installed and a custom b-pipe (with the extra o2 bungs) in the next few weeks. I want to ceramic coat the plenum on the outside for cosmetic reasons and the fact that it cools it down doesn't hurt. And yes I am planning on port matching the lower half as soon as the engine is stripped due to the fact that it is burning oil and the dealership is providing me with a new block under warranty. So when they strip it I will bring it to work, set it up on the mill and open up all the ports. And if I don't receive any gains from matching the ports I really don't care since it won't cost me anything to do it myself. But something tells me it will enhance the gains from the header installation, which will also cost me nothing because the nissan dealership I am going to has an awseome service manager. Why would I pay (what is it ?)700 + for extrude hone? I can polish everything on the inside myself at work....
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