adjusting boost?
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Senior User
Joined: Jul 2007
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adjusting boost?
on the highway when i put the petal to the floor i can hit 20psi easy.
i know that is no where close to beeing safe on a stock engine. I called around to some local diesel garages and talked to a few mechanics who either said the boost cant be adjusted on the turbo that came with that engine and even one claimed the turbo on the IDIs didnt have a wastegate.
so my question is if i cant find any mechanic to adjust the wastegate how hard would it to be to do myself? (adjusting the wastegate is what controls the boost on these trucks right??)
i have a decent amount of expierence working on cars but never on turbos. I know i can control the boost with my right foot, but id like to be able to floor it and not have to worry about anything.
i know that is no where close to beeing safe on a stock engine. I called around to some local diesel garages and talked to a few mechanics who either said the boost cant be adjusted on the turbo that came with that engine and even one claimed the turbo on the IDIs didnt have a wastegate.
so my question is if i cant find any mechanic to adjust the wastegate how hard would it to be to do myself? (adjusting the wastegate is what controls the boost on these trucks right??)
i have a decent amount of expierence working on cars but never on turbos. I know i can control the boost with my right foot, but id like to be able to floor it and not have to worry about anything.
Senior User
Joined: Jan 2007
Posts: 383
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From: Jamestown, Ohio
If it is a stock ats turbo it is the round thing with rod sticking out of the back of it on the left hand side of the turbo (if you are facing it). It is attached to a small plate with two bolts and the rod attaches in the back with a clip. Turning it up and down can be hard without breaking the rod or hurting the diaphram in the wastegate. Your best bet is to take the wastegate out (two bolts and a clip) and clamp the rod in a vice while you turn the other end with some vice-grips. Careful not to break it.
By the way I was making 15psi with my wastegate turned in and the fuel turned up but that was pushing it without studs.
By the way I was making 15psi with my wastegate turned in and the fuel turned up but that was pushing it without studs.
Senior User
Joined: Mar 2004
Posts: 358
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Hi guys,
if you don't mind me 'piggybacking' on this thread, what is appropriate boost levels ?
I have a fabricated powerstroke turbo installed on my 88 7.3, no wastegate. My boost gauge shows maximum boost of about 8-9 pounds. I was always hoping for more, but maybe it's OK.
Comments ?
if you don't mind me 'piggybacking' on this thread, what is appropriate boost levels ?
I have a fabricated powerstroke turbo installed on my 88 7.3, no wastegate. My boost gauge shows maximum boost of about 8-9 pounds. I was always hoping for more, but maybe it's OK.
Comments ?
Senior User
Joined: Jan 2007
Posts: 383
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From: Jamestown, Ohio
7psi is stock, but 12psi is the magic number that they say not to exceed if you don't want to replace alot of head gaskets.
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
The orange circle is where the arm adjusts at.
The rod into the wastegate actuator can not turn or the diaphram will be torn, so be carefull.
Also you are working against a spring when you adjust the arm, so expect a fight from the actuator when you remove and reinstall the rod on the arm.
At the very top of the picture you can almost see the E clip that has to be removed so you can remove the rod from the arm to adjust the rod.
Loosen the locknut before you remove the rod from the wastegate arm.
You need to make the rod longer to lower the boost pressure, as I remember it was something like 1.5 PSI per full turn of the adjustment.
I would go 3.5 turns and get it down to 15 for a max boost.
Last edited by Dave Sponaugle; Dec 25, 2007 at 04:57 AM.
Mountain Pass
Joined: Feb 2006
Posts: 132
Likes: 4
I have a 1994 IDI turbo truck too. I have a Pyro kit ordered. I have read a lot about turning up the max fuel setting on the pump. (but waiting to do so for the pyro) Should I also toy with increasing the boost via the info on this post?