Waste gate
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
That's turbo backpressure coming back through the intake--it's also known as a turbo fart. There is lots of discussion on this issue and is caused by the lack of a wastegate.
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Junior User
Joined: Apr 2004
Posts: 51
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From: HAMPTON, GA ... AN HOUR S
Thats what they are calling a turbo fart? Got it.Thanks. There is a aftermarket turbo controler that you can put on these trucks but what would be the use?
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Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
What kind of turbo controller are you refering to??? "JakeBrake" controller or a cooldown controller on shutdown. A "Jakebrake" controller could cause you turbo damage or other issues. The VGT turbo is NOT designed to operated this way.
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Junior User
Joined: Oct 2006
Posts: 64
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Originally Posted by 6L PWR
Because of the VGT turbo. It can control the amount of boost with the variable vanes. Wastegates are for turbos that can't vary their vanes. There has to be a way to limit the boost.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
VGT=variable gate turbo. There are vanes inside the turbo that open and close as controlled by the computer. They effectively change the inner housing size of the turbine (exhaust) side of the turbo to change the boost pressure.
http://dan.prxy.org/Truck/6L_bible_h.../Page_036.html
http://dan.prxy.org/Truck/6L_bible_h.../Page_035.html
http://dan.prxy.org/Truck/6L_bible_h.../Page_034.html
I hope these links work--they should answer lots of your questions about how the VGT turbo works
http://dan.prxy.org/Truck/6L_bible_h.../Page_036.html
http://dan.prxy.org/Truck/6L_bible_h.../Page_035.html
http://dan.prxy.org/Truck/6L_bible_h.../Page_034.html
I hope these links work--they should answer lots of your questions about how the VGT turbo works
Postmaster
Joined: Jun 2006
Posts: 2,799
Likes: 1
Originally Posted by GLAMIS
How does a VGT turbo control the amount of boost? Isn't it the more exhaust the more boost? With a waste gate wouldn't it eliminate over boosting? Iv'e heard of these turbo's making over 33 lbs.
On Edit: Thanks Npccpartsman. We must've been tping at the same time, but I was too lazy to look up the bible references. lol
Postmaster
Joined: Apr 2004
Posts: 2,654
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From: Bossier City, LA
Because it is able to make the wheel positive or neutral in pitch, turbos are highly ineffiecient outside of set parameters, meaning small changes make very large differences in compression ratio, this is what the thinking outside the box was, by putting a VGT turbo on, we won't have to have a wastegate, the turbo will able to control the boost right at the compressor wheel. Eliminating the need for an actuator to control the wastegate an decrease turbo lag and shorten the ammount of time to turbo is at or overboosting the system.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
LOL--6L PWR just happened to have it open looking at fuel system parts so it was an easy post.
Yes, Ryan, I wish they'd get the tech folder back up too. It has to be a huge job for the responsible party just because of all the knowledge that has been gathered there over the years. The advances of technology don't let us gap plugs at .35 and points at .12 anymore.........dang those were the good old days
Yes, Ryan, I wish they'd get the tech folder back up too. It has to be a huge job for the responsible party just because of all the knowledge that has been gathered there over the years. The advances of technology don't let us gap plugs at .35 and points at .12 anymore.........dang those were the good old days
