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Old 11-15-2010, 05:39 PM   #1 (permalink)
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Boost elbow adjustment

Just to make sure I understand the boost elbow adjustment that comes with the fuel plates:
loosen small allen plug to decrease boost
Tighten small allen plug to inclrease boost


After swapping in the fuel plate I now get near 40 psi at full throttle. After reading on the forum it sounds like anything over 35 on the stock turbo is just waisted effort. I was going to adjust the elbow screw to reduce the max pressure.
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Old 11-15-2010, 05:56 PM   #2 (permalink)
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That is correct. Just be aware that the allen screw creates a big result from little adjustment, so only test it doing it 1/8 turn of the screw at a time.
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Old 11-15-2010, 06:18 PM   #3 (permalink)
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ok, thank you.
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Old 11-15-2010, 06:53 PM   #4 (permalink)
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i know this isnt the elbow you're talking about, but on my truck i have a T fitting on the AFC housing that comes from the turbo wastegate. it has a small hole drilled in it and it looks like boost excapes here so im assuming thats for the wastegate control right? to up the boost i can drill this out a little more, or to decrease it i can fill it with JB weld right? or should i just buy the adjustable elbow?
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Old 11-15-2010, 06:56 PM   #5 (permalink)
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Quote:
Originally Posted by 4320diesel View Post
i know this isnt the elbow you're talking about, but on my truck i have a T fitting on the AFC housing that comes from the turbo wastegate. it has a small hole drilled in it and it looks like boost excapes here so im assuming thats for the wastegate control right? to up the boost i can drill this out a little more, or to decrease it i can fill it with JB weld right? or should i just buy the adjustable elbow?
I don't remember seeing a hole on that fitting. Got a pic or better description of where it is on the AFC fitting?
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Old 11-15-2010, 07:00 PM   #6 (permalink)
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ill grab a pic after supper. this truck is set up strange. instead of the WG sensing line coming off of the compressor housing, the WG sensing line hooks to that T screwed into the end of the AFC housing, then the last end of the T fitting is hooked to the intake manifold. its kinda strange, ill see if i can get a picture even though its packed down in there out of normal sight.
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Old 11-15-2010, 07:05 PM   #7 (permalink)
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Quote:
Originally Posted by 4320diesel View Post
ill grab a pic after supper. this truck is set up strange. instead of the WG sensing line coming off of the compressor housing, the WG sensing line hooks to that T screwed into the end of the AFC housing, then the last end of the T fitting is hooked to the intake manifold. its kinda strange, ill see if i can get a picture even though its packed down in there out of normal sight.
That's actually normal on the 12V's. It uses boost pressure for the AFC as a way of controlling black smoke (or emissions purposes). But this hole is what I am wondering about.
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Old 11-15-2010, 08:08 PM   #8 (permalink)
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ok i found out what i was thinking of. the T fitting has no hole in it. the little brass elbow hooked to the T fitting that goes to the waste gate does though, as well as a allen screw in it, so im assuming the previous previous owner put an adjustable fitting in it, even though the dumb dinosaur had no boost gauge to monitor how high it got. right now boost gets close to 30 psi or so, so ill re do the fuel plate, then adjust the boost to max out at around 35 psi and call it good for now untill i get a new clutch.
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Old 11-15-2010, 08:37 PM   #9 (permalink)
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Quote:
Originally Posted by 4320diesel View Post
ok i found out what i was thinking of. the T fitting has no hole in it. the little brass elbow hooked to the T fitting that goes to the waste gate does though, as well as a allen screw in it, so im assuming the previous previous owner put an adjustable fitting in it, even though the dumb dinosaur had no boost gauge to monitor how high it got. right now boost gets close to 30 psi or so, so ill re do the fuel plate, then adjust the boost to max out at around 35 psi and call it good for now untill i get a new clutch.
At least now you know you got a boost elbow on that thing.
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Old 11-15-2010, 08:39 PM   #10 (permalink)
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yea, im pretty happy about that thanks for your help, and sorry for the hijack of the thread.
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Old 11-15-2010, 11:24 PM   #11 (permalink)
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N worries, I'm still have this weird thought that these forums are for help and if two questions can get answered in one thread thats a good thing, right?!
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Old 01-25-2013, 11:43 AM   #12 (permalink)
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My '94 WH1C turbo is making 38 psi without a boost elbow. Any thoughts on that? The plumbing for the pressure line to the waste gate is all intact. Seems like the waste gate is wired shut or something but it all looks normal.

thanks
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