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wastegate

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4everboosted

Proven Member
97
3
Dec 6, 2013
Butler, Pennsylvania
I have the big evo3 turbo. My question is if you follow the wastegate actuator arm to the turbo inlet side, you see a brass colored round object with a nipple there that looks like its for a vacuum line. What is that nipple for and is it supposed to be open? Mines open but I noticed someone had a line running off of theirs in a picture I was looking at recently.
 
You mean the thing in the lower left corner of the pic?
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The brass colored round object is the wastegate actuator. The nipple is supposed to be hooked to a boost controller.
 
yes! the thing in the left corner. Well I don't have a boost controller, so without one, is there still supposed to be a line there?
 
pauleyman I bought the car like this... the kid hacked the hell out of it, the cars a piece of junk and im trying to figure it out. It runs like hell, the turbo has shaft play and wont boost. All I can say is I better never see the kid I bought this car off of again.
 
but that's what I'm asking I need to know how its supposed to be
 
here's a couple pics of what it looks like...

This is my greddy type rs bov. The vacuum line runs to the intake manifold and that's it.
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Here's the wastegate nipple I was talking about without a line on it. Also that's a boost leak tester in top left corner.
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Where is the line from the wastegate actuator supposed to go? Is it spliced in with the bov? Is there somewhere its supposed to connect to? I don't know. I know this setup is wrong, I'm looking for someone to actually show me the correct way its supposed to be, and no I don't have a manual boost controller. The turbo is shot and needs rebuilt, (has shaft play back and forth, and side to side). From what I can figure the wastegate isn't opening because the vacuum line needs to be hooked up somewhere. Any good advice would be appreciated. Also does that bov look right? Supposedly has an atmospheric dump. There are places on the intake capped off.
 
I looked at the link... However I do not see a nipple for it on the compressor housing, but there is a threaded hole where the j-pipe meets it. Should there be a nipple threaded in there? I'm trying my best to figure this out, but its tough to follow vacuum diagrams, when your car has been changed around by someone else.
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Alright thanks for everyone's help I got it figured out now. I ordered a turbo rebuild kit for it, being as this line isn't hooked up correctly it probably was pushing too much boost :banghead: and that's what ruined it. Way too much shaft play in every direction
 
A journal bearing turbo is supposed to have some radial play. It should not have axial play. Btw up and dow and side to side are the same thing. Its in and out thats an immediate problem. Too much radial is also a problem.
Technically any intake pressure sorce will work for wastegate. Just to get you by tee into that bov line.
 
when I say side to side I mean in and out such as I pull on the shaft, up and down I mean pushing up or pulling down.
 
its the internal wastegate should have a vacume line going from that to the nipple on the turbo u must not be pushing that much boost as its a huge boost leak without it plugged in
 
its the internal wastegate should have a vacume line going from that to the nipple on the turbo u must not be pushing that much boost as its a huge boost leak without it plugged in
what do you mean? its not a boost leak, the wastegate isn't opening because theres no vacuum pull to tell it when to open, so it should be the exact opposite and the car is boosting too much.
 
its the internal wastegate should have a vacume line going from that to the nipple on the turbo u must not be pushing that much boost as its a huge boost leak without it plugged in

That threaded hole on the turbo is not a boost leak, the hole doesn't go all the way through.
 
The wastegate works off of boost. BOV off of engine (post throttle body) vacuum.

And technically, the wastegate isn't designed to see vacuum, as far as I know. But I've gotten away with it for a few months.
 
The wastegate works off of boost. BOV off of engine (post throttle body) vacuum.

And technically, the wastegate isn't designed to see vacuum, as far as I know. But I've gotten away with it for a few months.
I'm talking about the wastegate actuator where there is that nipple for the vacuum line. They both work the same way the bov has a vacuum line to the intake manifold, and the wastegate to the j-pipe or lower ic pipe.
 
I'm talking about the wastegate actuator where there is that nipple for the vacuum line. They both work the same way the bov has a vacuum line to the intake manifold, and the wastegate to the j-pipe or lower ic pipe.

They do not work the same way. The BOV opens when it sees vacuum or negative pressure, that's why its connected to the manifold it doesn't see vacuum until the throttle body is closed. The wastegate actuator works off of boost or positive pressure, it is connected to a boost source like the compressor cover or IC pipe its not a vacuum line. If you blow air from a compressor into the line going to the wastegate actuator it will open.
 
Alright thanks for everyone's help I got it figured out now. I ordered a turbo rebuild kit for it, being as this line isn't hooked up correctly it probably was pushing too much boost :banghead: and that's what ruined it. Way too much shaft play in every direction

Doubtful. Assuming you didn't hit fuel cut first, exhaust pressure would blow open the wastegate flapper long before the turbo reached dangerous speed. I'd be more suspicious of the oil supply and turbo balance.

Are you going to be rebuilding the turbo yourself?
 
I ordered a turbo rebuild kit for it, being as this line isn't hooked up correctly it probably was pushing too much boost :banghead: and that's what ruined it. Way too much shaft play in every direction
While I hate to be the bearer of bad news, *Way too much shaft play in every direction* isn't going to be solved with a rebuild kit. You should be turbo shopping instead.

Don't take this the wrong way....but please seek some professional assistance if you're going to be attempting this rebuild on your own.
 
They do not work the same way. The BOV opens when it sees vacuum or negative pressure, that's why its connected to the manifold it doesn't see vacuum until the throttle body is closed. The wastegate actuator works off of boost or positive pressure, it is connected to a boost source like the compressor cover or IC pipe its not a vacuum line. If you blow air from a compressor into the line going to the wastegate actuator it will open.
While I hate to be the bearer of bad news, *Way too much shaft play in every direction* isn't going to be solved with a rebuild kit. You should be turbo shopping instead.

Don't take this the wrong way....but please seek some professional assistance if you're going to be attempting this rebuild on your own.
I'm not trying to say they both wok off vacuum I'm saying they both have a vacuum line that let's them know when to open. My wastegate does not have that line. Also I pulled the turbo and cannot get the wastegate to open even by unbolting it so exhaust pressure cannot open it. The car just will not boost anymore it cuts out and hesitates. Being as the wastegate is stuck shut I'm throwing a new turbo on and getting rid of it, it's a hacked up pos. Wish I would have known before I bought it..
 
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