wastegate question
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Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
wastegate question
I am trying to understand the results of my experiments with my wastegate, but I need to know what the computer does too.
My guess is that it is a closed loop boost control system, and it works like this.
MAP measures boost
Wastegate controls boost
Computer controls electronic operated pressure valve to control wastegate.
Does the computer ONLY operate the valve when the MAP sees over 25psi? Sounds like from an earlier post that the exhaust gas pressure also influences the wastegate operation as well
My issue looks like a worn out wastegate (spring). I added a $5 throttle return spring to assist the internal wastegate spring, and now I get the same boost with or without the red hose attached.
Can I adjust the wastegate so that there is some preload and get to the same place as a temporary ghetto spring fix? There is no slack in the rod.
How much is a new wastegate actuator?
My guess is that it is a closed loop boost control system, and it works like this.
MAP measures boost
Wastegate controls boost
Computer controls electronic operated pressure valve to control wastegate.
Does the computer ONLY operate the valve when the MAP sees over 25psi? Sounds like from an earlier post that the exhaust gas pressure also influences the wastegate operation as well
My issue looks like a worn out wastegate (spring). I added a $5 throttle return spring to assist the internal wastegate spring, and now I get the same boost with or without the red hose attached.
Can I adjust the wastegate so that there is some preload and get to the same place as a temporary ghetto spring fix? There is no slack in the rod.
How much is a new wastegate actuator?
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Does the computer ONLY operate the valve when the MAP sees over 25psi?
Sounds like from an earlier post that the exhaust gas pressure also influences the wastegate operation as well
Can I adjust the wastegate so that there is some preload and get to the same place as a temporary ghetto spring fix?
Or just do what I did and get an aftermarket wastegate actuator. Banks and TurboMaster both make one for the stock turbo.
Elder User
Joined: May 2007
Posts: 752
Likes: 0
From: New Orleans
the way i was thinking was the red line was just so the map sensor knows when to cut down fuel. the waste gate should open by press like a blowoff valve or somthing. and a new waste gate is about 150-180 if i remember correct.
Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
Originally Posted by smoky_diesel
My issue looks like a worn out wastegate (spring). I added a $5 throttle return spring to assist the internal wastegate spring, and now I get the same boost with or without the red hose attached.
Can I adjust the wastegate so that there is some preload and get to the same place as a temporary ghetto spring fix? There is no slack in the rod.
How much is a new wastegate actuator?
Can I adjust the wastegate so that there is some preload and get to the same place as a temporary ghetto spring fix? There is no slack in the rod.
How much is a new wastegate actuator?
It looks so simple doesnt it?
I have actually got all the parts together to make one and have been working on it but the "ghetto spring fix" is working so well that I may just leave that.
BTW a new stock WG actuator is about $300 from FOMOCO, and what I have been told is that its a dealer only part. i.e. none at autozoo,advanced,orielleys,NAPA
Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
Originally Posted by blksiryder
the way i was thinking was the red line was just so the map sensor knows when to cut down fuel. the waste gate should open by press like a blowoff valve or somthing. and a new waste gate is about 150-180 if i remember correct.
I have a WG actuator on my work bench dismantled, I will snap some pics so all can see, but if you look at the one on dieselsite that is basically what it looks like inside.
Thread Starter
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Cargo Master
Joined: Sep 2007
Posts: 2,470
Likes: 535
From: Chandler, AZ
Thanks to everyone for the info. still al little corn-fused with this explaination from dieselsite;
The downside is the wastegate opens and closes often prior to "set point" simply because of it's design. Aftermarket "actuators" simply are higher tensioned springs. You could accomplish this simple task by shortening the wastegate rod.
It delays the "set point", but doesn't overcome the issue of the wastegate's lack of staying shut until desired.
what's the difference between 'delay' and 'until desired'. Sorry, I'm one of those engineer types....
The downside is the wastegate opens and closes often prior to "set point" simply because of it's design. Aftermarket "actuators" simply are higher tensioned springs. You could accomplish this simple task by shortening the wastegate rod.
It delays the "set point", but doesn't overcome the issue of the wastegate's lack of staying shut until desired.
what's the difference between 'delay' and 'until desired'. Sorry, I'm one of those engineer types....
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Post Fiend
Joined: Sep 2006
Posts: 5,584
Likes: 0
From: Millbrook Alabama
Originally Posted by smoky_diesel
Thanks to everyone for the info. still al little corn-fused with this explaination from dieselsite;
The downside is the wastegate opens and closes often prior to "set point" simply because of it's design. Aftermarket "actuators" simply are higher tensioned springs. You could accomplish this simple task by shortening the wastegate rod.
It delays the "set point", but doesn't overcome the issue of the wastegate's lack of staying shut until desired.
what's the difference between 'delay' and 'until desired'. Sorry, I'm one of those engineer types....
The downside is the wastegate opens and closes often prior to "set point" simply because of it's design. Aftermarket "actuators" simply are higher tensioned springs. You could accomplish this simple task by shortening the wastegate rod.
It delays the "set point", but doesn't overcome the issue of the wastegate's lack of staying shut until desired.
what's the difference between 'delay' and 'until desired'. Sorry, I'm one of those engineer types....
I just went out to the shop and took pics of the dissassembled WG actuator. give me a few minutes to add them to my TECH gallery.
Pics in my tech album have a look
Last edited by bdrummonds; Oct 3, 2007 at 05:19 PM.
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