Wastegate Is Off......
Harlan, how would heat affect a possibly warped or prior heat damaged WG?
For instance, Daniel can get the WG to work fine off of the car in ambient temps. However, if something in the WG were no longer true and exposed to the heat of the exhaust could it possibly function improperly then?
For instance, Daniel can get the WG to work fine off of the car in ambient temps. However, if something in the WG were no longer true and exposed to the heat of the exhaust could it possibly function improperly then?
It's possible. Valve stem could be bent, and binding in the guide.
The hat might be leaking at temp, etc.
Have you guys actually taken the valve completely out of it and checked it for straightness?
The hat might be leaking at temp, etc.
Have you guys actually taken the valve completely out of it and checked it for straightness?
Originally Posted by y2khawk
It's possible. Valve stem could be bent, and binding in the guide.
The hat might be leaking at temp, etc.
Have you guys actually taken the valve completely out of it and checked it for straightness?
The hat might be leaking at temp, etc.
Have you guys actually taken the valve completely out of it and checked it for straightness?
I still feel the WG is in need of being replaced or rebuilt at the least.
I'd probably take the valve and the WG over to Newman's Machine shop in Portsmouth, Daniel. Have them make sure the valve and the guide it moves (I assume it has a valve guide to travel in, maybe not, I have never seen a cutaway view of a WG) in is not warped and is within spec to make sure the valve is straight and the guide it moves in is fine.
Originally Posted by KAOS
wg going back on as we speak so we will see
I'd have a machine shop check out the WG first. That's just me, though.
The fact that it seems to work at ambient temps in water doesn't do it for me b/c it doesn't reproduce the condition in which it operates. The exhaust temps experienced are insane compared to ambient temps.
Last edited by CANNIBAL; Aug 20, 2004 at 05:15 PM.
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Verdad Gallardo same fn problem. wg has got to be bad and hks said i am making too much power for a standard WG and that i need to step up to a racing waste which involves takeing everything off and having it fabbed and the put the whole kit back on. f that. not going to get into that right now. so if some one is interested in the car let me know
Originally Posted by KAOS
wg has got to be bad
Just get a new replacement one of the same kind and slap it on. If it doesn't work, send it back
I really think that would fix it. Rob uses the same WG on his big HP setups, AFAIK. Also, from what I remember, Harlan said the HP ratings of WGs really don't have too much say yes or no in regards to functioning with "x" amount of power.
Originally Posted by MIGHTYMOUSE
i had to buy another w/g for that kit to find out that the w/g was not the problem before i sold it. hope it doesn't happen to you too.
What symptoms were you having that made you purchase a new WG?
Last edited by CANNIBAL; Aug 21, 2004 at 09:04 AM.
On The Tree
Joined: Nov 2001
Posts: 1,100
Likes: 0
From: Charlestown, Indiana
I know what HKS says about the WG size, but trust me, it's not too small. I can list you 50 Turbo Buick guys running the same exact gate on 700rwhp cars. I had the same one on my 9second Buick, my 9 second Z and the 792rwhp Formula. I too think that something is probably wrong with either the WG itself, or the seat in which the valve of the WG seals. I know Warbird said that ARE did some welding on the kit/piping...maybe there is some slag around the seat?
Also, since you said the problem didn't happen until AFTER you replaced the vacuum lines, I would look there more closely. Bottom line is, it worked fine at the dyno and on the street here. If the WG was too small, it would NEVER have worked. In other words, something went bad in the interim time.
MM didn't have a problem with too much boost, he had boost drop (if I remember correctly).
Also, since you said the problem didn't happen until AFTER you replaced the vacuum lines, I would look there more closely. Bottom line is, it worked fine at the dyno and on the street here. If the WG was too small, it would NEVER have worked. In other words, something went bad in the interim time.
MM didn't have a problem with too much boost, he had boost drop (if I remember correctly).
I think a new WG from HKS or Rob will fix it.
I sent KAOS a link to get better vacuum tubing from http://www.hightempsilicone.com so that when he gets his new WG he can use this high quality tubing, too.
I sent KAOS a link to get better vacuum tubing from http://www.hightempsilicone.com so that when he gets his new WG he can use this high quality tubing, too.
On The Tree
Joined: Nov 2001
Posts: 1,100
Likes: 0
From: Charlestown, Indiana
Originally Posted by Warbird
Never welded anywhere close to the wastegate. All welding was done disassembled on the manifold with the WG removed. Can't blame me for that one 
However, it's apparent from your answer that either you can't read well, or you only read what you want. You say that the "welding was done on the manifold with the wastegate removed". And that's EXACTLY why I said what I did. You see, the WG "seat" is ON THE MANIFOLD.
Duh. (not that I expected you to know what I was talking about anyway) so what should i do. just buy another waste gate? and the vac tubing wsnt changed until after i noticed the problem, i think. plus the tubing was changed several times. going to order a new WG on monday and a check valve. pray to god that it works. if not im not sure what to do next. i want a 12bolt and hals but i would love to get it working first. and it is NOT making the power and tq it was down at robs it wont even turn the nittos over on a damp road from a slow roll. i'll call you on monday rob to ask you some more questions. and WARBIRD did you get my pm's
TECH Enthusiast
Joined: Mar 2002
Posts: 602
Likes: 0
From: ft worth tx
Originally Posted by MIGHTYMOUSE
i had to buy another w/g for that kit to find out that the w/g was not the problem before i sold it. hope it doesn't happen to you too.
plus there are some rough welds up in there but it should have effected it on that day at the dyno correct? ALSO this happened over NIGHT, how can a WG go bad from spinning tires at 70 then pulling it on a trailor then getting it home then the WG go bad?