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1999 EJ8
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Discussion Starter #1
Well, I finally hooked up my VDO boost gauge today because my friend had a suspicion that I was having some Boost Creep.

I just ran the line up through the hood and around into the window so I could hold onto it. And my results, scared the shit out of me.

I'm suppose to be on base wastegate pressure of 5.5psi on my 15g.

I apologize in advance, the videos obviously came from my phone, but it still gets the point across.

Look what I am getting:







Soooo, what is wrong with my internal wastegate? :detective:

And how do I fix it?
 

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There is not boost signal going to it.

What are you running for boost control?

I would try to actuate the wastegate actuator with an air nozzle just to make sure the diaphragm isn't ruptured or something odd like that.
 

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1999 EJ8
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Discussion Starter #4
Everything is holding up surprisingly well. This is definitely the reason why the headgasket went. So far I've been trying to take it easy on it, did some pulls and it feels strong as hell lol.

So now that I actually know when I'm going into boost, I'm going to be staying out of it for a while until I fix this issue.

It seems like the wastegate isn't opening?
 

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Everything is holding up surprisingly well. This is definitely the reason why the headgasket went. So far I've been trying to take it easy on it, did some pulls and it feels strong as hell lol.

So now that I actually know when I'm going into boost, I'm going to be staying out of it for a while until I fix this issue.

It seems like the wastegate isn't opening?
There is not boost signal going to it.

What are you running for boost control?

I would try to actuate the wastegate actuator with an air nozzle just to make sure the diaphragm isn't ruptured or something odd like that.
Well?
 

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1999 EJ8
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Discussion Starter #7
There is not boost signal going to it.

What are you running for boost control?

I would try to actuate the wastegate actuator with an air nozzle just to make sure the diaphragm isn't ruptured or something odd like that.
I'm running no boost controller, I'm at the mercy of the internal wastegate. I just put a fresh vacuum line from the wastegate "nipple" to the "nipple" on the compressor housing.

I've heard it would be best to have a source on a charge pipe, after the intercooler, to source boost from.

Explain the air nozzle with actuator. Just blow into it?

Should I try to lube up the rod or anything?
 

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That is exactly what I dealt with with my old Miata running a 2854.

How is the wastegate set?
Try adjusting the actuator out until you only have to pull the rod half the diameter of the flapper pin to get it on the pin. Thats about as loose as you can get it where it wont leak boost.

Also, pictures of your DP please.

EDIT:
The best place for the boost signal would e on the cold side charge piping. But that will only make your current situation worse. So keep it on the compressor for now.
 

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I'm running no boost controller, I'm at the mercy of the internal wastegate. I just put a fresh vacuum line from the wastegate "nipple" to the "nipple" on the compressor housing.

I've heard it would be best to have a source on a charge pipe, after the intercooler, to source boost from.

Explain the air nozzle with actuator. Just blow into it?

Should I try to lube up the rod or anything?
Yeah, if you have access to compressed air, just use a air nozzle to pressurize the wastegate actuator a little to make sure it actually moves.

Also, might see of the flapper is possibly seized for some reason too.
 

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Yeah, if you have access to compressed air, just use a air nozzle to pressurize the wastegate actuator a little to make sure it actually moves.

Also, might see of the flapper is possibly seized for some reason too.
Emphasis on "a little"
Too much pressure will break it, so either regulate it down or just give it a tiny little squeeze.
Ive alwasy done it with a bicycle pump by rigging a a valve stem to a hose and connecting it to the actuator (usually duct tape is needed, haha)
 

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1999 EJ8
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Discussion Starter #11
How is the wastegate set?
Try adjusting the actuator out until you only have to pull the rod half the diameter of the flapper pin to get it on the pin. Thats about as loose as you can get it where it wont leak boost.

Also, pictures of your DP please.

EDIT:
The best place for the boost signal would e on the cold side charge piping. But that will only make your current situation worse. So keep it on the compressor for now.
I've never touched an internal wastegate before, only messed with externals.

This is about the best pic that I have of the actuator arm:



I also don't have pictures of my DP, it's just the stock barely 2" GReddy downpipe.

What should I do with it, rattle it around? lol
 

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Well you should remove the wastegate and test it like mentioned above.

But before you do that try adjusting it if you can (it might not be adjustable, idk much about DSM turbos)
It should have a threaded shaft with a female piece on the end that has a hole in it (which slides over the pin on the wastegate flapper), and it should have a lock nut.
Remove the clip off the pin and pull the actuator rod off and adjust the end out.

Also, see how far the flapper opens with the rod disconnected. It should open roughly 90 degrees.
 

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1999 EJ8
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Discussion Starter #14
Well you should remove the wastegate and test it like mentioned above.

But before you do that try adjusting it if you can.
It should have a threaded shaft with a female piece on the end that has a hole in it (which slides over the pin on the wastegate flapper), and it should have a lock nut.
Remove the clip off the pin and pull the actuator rod off and adjust the end out.

Also, see how far the flapper opens with the rod disconnected. It should open roughly 90 degrees.
Awesome! Sounds like the project for tomorrow. I'll fiddle around with it and see if I can get it to maintain a proper pressure.

Thanks for the insight everyone!
 

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From 5.5psi to 20 is quite the jump! LOL Bet it was fun though! Can't view the vids at work, but it definitely sounds like a WG issue. Wish you luck on the fix!
 

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94 Civic Hatch
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i was wondering if you clocked the turbo at all ? ifso perhaps you jammed the arm up a lil preventing it from working properly. i know with my t25 im going to have to fab a new bracket because the stock internal waste gate is preventing me from clocking the turbo too much.

just an idea that i thought i'd run across you. good luck i hope you figure it out before you break something
 

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1992 Civic Si
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Holy SHIT dude that thing jams hahaha

I blew up my A6 from just 14 psi on my old 15g, so careful is all I can say. But shit, if she likes it, I'd say keep it around there haha. Get it on a dyno and do some pulls with a wideband.
 

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Del sol
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Just a thought never had a turboed d but on my dsm if I wanted my bov to release when my wastgate did you run a vacuum line from the wg to the bov. Not to step on toes just giving my .02
 
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