something purging air
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Freshman User
Joined: Sep 2009
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something purging air
i just had the sct tuner put on "wow" woke the truck up ,but i just used the towing tune and now as it climbs up hills or shifts gears theres like a long purg of air that blowes until ether i let off gas or floor it. i know the tubo releases pressure as you drive but this air sound goes on for a long time, not sure about power loses cause thruck is still to new to me.2001 f250 7.3 powerstrock.. any help. the only thing on truck is cold air filter but that has been done months ago....
Postmaster
Joined: Dec 2008
Posts: 3,340
Likes: 2
You are probably hearing turbo surge which is hard on the turbo. Installing a WW on the compressor side is suppose to reduce or eliminate it.
Here is a little video showing the surge: http://www.youtube.com/watch?v=evGFfuhUaRM
Here is a little video showing the surge: http://www.youtube.com/watch?v=evGFfuhUaRM
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Have you got the SCT where you can monitor engine parameters? You didn't specify, but have you upgraded the exhaust and installed an EGT probe in the maniford or up pipe?
Back to your question, if you're not hearing that kind of surge, what boost pressure are you at when the noise happens? Maybe you're hearing the wastegate?
The other possibility is you're just hearing the normal turbo noises through the cold air intake. The tuner may have woke things up enough that you can now hear it.
Instead of saying a long time, tell us how many seconds this noise goes on for. Is it a high pitched sound or a low tone?
Back to your question, if you're not hearing that kind of surge, what boost pressure are you at when the noise happens? Maybe you're hearing the wastegate?
The other possibility is you're just hearing the normal turbo noises through the cold air intake. The tuner may have woke things up enough that you can now hear it.
Instead of saying a long time, tell us how many seconds this noise goes on for. Is it a high pitched sound or a low tone?
Postmaster
Joined: Jul 2004
Posts: 3,156
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From: Yuba City, CA.
I think you are just hearing the turbo spooling up and sucking air. Can't really tell though with out some more information.
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Laughing Gas
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