Is it the BOV or the wastegate getting stuck open?

[98240]

Well I finally got the car running good. When I gett to about 4 psi you can start to hear a shhhhhhhhhhhhhh. The when I get to about 5psi it is really loud and constant. Is this the blow off valve or the wastegate getting stuck open? If you guys need video of it I can film it. The wastegate is suppose to have a 10psi spring in it. So this is why I am unsure, also it makes about the same noise as the bov when it goes off.

Forgot to add this greddy type rs tial wastegate

[WDRacing]

If the wastegate is vented to the atmosphere then it will make a distinct noise when it opens. It will be a very loud open header type of noise. If its an air leak type of noice then it's either piping or maybe a BOV.

WD

[98240]

So simply tightning the bov wont make a difference?

Thanks
Modified by 98240 at 5:40 PM 3/31/2006

[WDRacing]

Give it a shot, it'll either work or it won't....

[98240]

Well it didnt work so I am guessing I have a leak somewhere in my pipes I made a boost leak tester but I didnt find anything. I also hear a slight whistle when I hit the gas. Is it safe to drive like that?
Modified by 98240 at 7:08 PM 3/31/2006

[lrb_2000]

can't you just pop the hood, and see if you can see, or feel where the air is comming from?

[98240]

I tried that couldnt find it

[SeVa-S13]

can't you just pop the hood, and see if you can see, or feel where the air is comming from?

Kinda hard/stupid to try to create boost while parked in your garage. =\

Where are you getting your vacuum signals from for everything? (WG, BOV, and gauge...)

[180sx]

DO U HAVE EXHAUST MANIFOLD LEAK? whats ur wastegate psi set at ?

[Edub1]

You should be able to disconnect the BOV. Stick a cork in it if you must.

If it's hissing at idle you have a hose loose.

[98240]

My wastegate and bov are coming off the brake booster. My vacuum/boost is coming of the fpr. My wastegate is suppose to have a 10psi spring.

[lrb_2000]

maybe you are hitting 10psi, but your boost gauge is bad?

[SeVa-S13]

maybe you are hitting 10psi, but your boost gauge is bad?

That's what I was thinking maybe hapened. Try tapping off other vacuum sources and go for a spin? I usually get my boost gauges signal off a T'd line at the back of the plenum and WG right off the turbo.

[scarboroughdub]

even if the wastegate is set to lets say 7 psi, it will start to crack and open at 4-5 psi so it might just be your wastegete.

[98240]

Ill go film the noise and you guys can tell me what you think

[WDRacing]

There is still a huge difference in wastegate exhaust and the hiss of a vacuum/boost leak. One is like an open header, the other is like an air compressor.

WD

[98240]

More then likely it is a pipe but I cant find if I am not driving. I tried the boost leak tester but I cant find it. I guess I will take it to the dyno and look from there.

http://hustlecoke.com/randy/videos/carnoise.mov
Modified by 98240 at 10:02 PM 4/2/2006

[S13FX]

Ok bro Im sorry I am off topic but thats one awesome vid, your car sounds awesome heh

[david200095367]

wow, that thing sounds like ur in a tunnel or something. when i hit full throttle mine sounds a little like that, more like the sound produced when u spray water in a large metal pipe. maybe its ur turbo piping?

[98240]

I accidently hit the pwr on my hks evc IV and the noise went away. So I am going to look into that when I go to the dyno. Now instead of the noise kicking in around 3psi -5psi I dont get that anymore I just cant seem to hit anymore then 5 psi. Anyone else have a problem like that? Thanks

[98240]

I guess I was wrong about my last statement. I went to the dyno to see if i could see what pipe was leaking while it was running, After a few runs I decide to go under the car with a flash light to see what was going on. Well Once I hit boost my wastegate slowly starts to open and it stays open until you release the gas pedal. Anybody have a clue on how to fix this? I wonder if I put that little circular peice that goes in the wastegate wrong. Could it be because I have the line that goes in the side of the wastegate coming from teh compressor housing, would it make a difference if I changed that? It is going to be hard to take the wastegate off. I guess I will probably just have to take it off then take it apart to see what spring is in it. Thanks

[S14tat]

sounds like your WG is working fine, since you have a HKS EVC, why not try raising the boost to see if it will go higher? it sounds like you have the wrong spring in your WG.

[98240]

I had the evc powered off and it didnt make a difference. Once I hit boost the thing starts to open. Maybe I put that circular peice in wrong that is the only thing I can think of. I know that, that will cause you to leak when boosting. I will just have to wait till tommorow. (dam rain)