Ok guys, I know for sure my VIAS is broken.

I went 1/4 mile drag racing at the track for the first time yesterday and I finally put down some times for my Maxipad.

1st run:
16.1 @ 89 mph (launched 2500rpm, spun thru first gear with no traction)

2nd run:
15.5 @ 90 mph (launched 2000rpm and bogged off the line slow)

3rd run:
15.3 @ 91 mph (pretty solid launch with instant traction)


Now, according to Steven88, my trap speed isn't correct. There has to be something up with my car because stock VQ30DE-K maximas run with a trap speed of around 92-94mph.

I noticed that my VIAS isn't pulling hard in the high rpm's.

Now my question is, what should I do:

1) JB weld that thing and have it work again, or
2) leave the power valve open and get MEGA high end while suffering low end loss.

 

I think I am going to let my extended warranty fix it.

 

JB weld it, no doubt about it. It took me 15 min to do and my Maxima has never felt better. You dont want to leave the power valve open thats for sure.

 

why do you recommend not leaving the power valve out? im just curious.

 

kind of defeats the purpose of the VIAS. Having it completely open at all times would hurt low end. The vias lets the optimum amount of air in for each rpm range. but I dont have the experience of having mine JB welded open, Im only going by what Ive researched on the org.

 

ive had mine removed for right around 9 months. there is a definetely a low end loss but the gain up top is really nice. i do have headers which adds in the top end but even with the power valve in and functioning, there is still some restriction in flow. i figure if i need the power then im going wide open throttle and therefore spend that time in higher rpms where the gain is quite noticeable.

 

Hey sloppymax, do you have a picture or diagram on how to open the power valve?

 

i know that i lost 15 ftlbs to the wheels across the board with it out, and then when it didn't work i put 171 hp, and with it out i put down 192. i don't really like not haveing the torque. i'll put mine back in and fix it. i would say fix it, but that's just me. maybe you should just take it out for a few days see if you like and if not fix it. it's not that hard to do. just my .02

 

dont jb weld it.... it doesnt last long.... i jb welded my vais when it broke and it held on for a couple of months only.... i went to a professional welder to put it on and it only cost $50....

 

Well, um, Imma gonna have no VIAS on my car if someone can teach me how to open the power valve...Steven88

 

The funny thing is that i fixed my vias with JB weld, and i did not really notice any change... maybe because i am an automatic?...

 

I just could not get the dang thing open cause the screws are impossible to get to. I cant believe it only took you 15 minutes to do it. I spent an hour trying to figure it out then I quit. Any secrets to getting the job done from some of you guys who have done it a few times?

 

i took the intake off, and used vise grips on the screws. that was my trick, when i go to put it back in i'm going to find some other type of bolt that will work instead of the damn screws. there are two on top that are really easy to get, the only hard one is the one by the throttle body and you can just take it off. it wasn't that hard to me

 

i went to a shop and they did it for me...

 

then maybe when you reinserted the power valve then the clock (position) of the valve was incorrect. if the position is incorrect then it will rotate into the wrong stage either closed or open during the intended fucntion. it is a noticeable difference if it was indeed broken to begin. i am auto as well and noticed a huge difference above 5k rpms. sorry, i didnt take any pics during the removal.

 

i followed some dude's write up and the position was just like in the writeup...

 

ok, heres my timeslip:

Left---

Car#...293
Class...HS

DIAL... 15.50
R/T... .345
60'... 2.336
330'... 6.481
1/8... 9.915
MPH... 71.56
1000'... 12.873
MPH...
1/4... 15.356
MPH... 90.57

Left 1st 1.1097
Right MOV 1.1677
Compulink AUTOSTART ON!!
Both lanes STAGED @ Starter GO

 

That's probably just as bad as a USIM 4th gen.

 

maybe you just suck at driving! hahaha

 

First off I have a CAI which makes it easier to get at. If you have the stock air bow you might have to remove it first. I removed three bolts from the throttle body and spun it out of the way a little. After that it was pretty easy to acess all the bolts on the VIAS. Just make sure to check the position of the cup when you open it up so that you JB weld it in the correct position. The JB weld will hold forever if you properly clean the cup and post and use alot of JB weld inside the cup(theres tons of grease and dirt in the when you open it). Make sure you put the spring into the JB welded cup before it cures too much or it will be a ***** to get back together.

 

The low-end losses completely offset the high-end gains.

 

its called a shift in the powerband. my low end loss is offset by making a healthy increase of torque in higher rpms.

 

i do, i don't doubt it.

but either way, my VIAS doesn't work.

 

agreed.

 

hey, thats worse than a USIM....bolt on USIM 4th gens go into 95mph easily...your 4mph off!! damn dude...you need to reduce more weight?

 

Good luck on that you will be the first one to have a dealership preform this. Many people have tried taking it to a dealership and have them do it. Nobosy to my knowledge has been successfull but one person. The funny thing is they didnt even fix it they just put on another new faulty VAIS lol. I have a question myself though I will be performing this fix next weekend. I have opened up teh Vais to see what I am up against I have one question though. Using these pics as referrence




When you are inserting the spring in the JB weld do you insure that the interior of the spring has no weld coming in to it. The reason I askthis is the power rod has to go though the spring. Do you have to insure that the whole length of the interior of the spring is JB Weld free or can a little get in. Thanks for the input next week when I do this I will do a full write up.

 

Domo Kun!!!

 

how do you take off the plenum? its not even funny.