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Posted by Larry West [Email] (#1140) [Profile/Gallery] (more from Larry West) on Sat, 11 May 2013 10:23:41 Share Post by Email
In Reply to: You can live without it, Janik, Sat, 11 May 2013 07:49:06
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The "Hooter" valve is a bypass valve that routes compressed inlet air (i.e after the turbo) back to the inlet side of the turbo compressor (before the turbo) when the throttle is closed abruptly. The main purpose of the valve is to prevent hoses from being blown off, while also preventing the turbo from "stalling", or slowing down a lot. So, the valve helps keep the turbo spinning, so if you are on and off the throttle a lot, you don't have to wait for a stalled turbo to spin up.

In a race car, the valve would normally dump the excess pressure overboard, giving that "sneezing" sound. In a road car, you don't want that, and the car makers can't design it like that. One reason being is it would result in an overly rich mixture for a short time, which would not make the emissions trolls happy.

Bypassing keeps all the metered air inside the system, reducing the emissions impacts.

You may be able to do without on an LPT, but definitely NOT on an Aero.

BTW, the term "Hooter" comes from the sound a failing/failed bypass valve makes.

->Posting last edited on Sat, 11 May 2013 18:34:40.
_______________________________________
Current:
2002 9-5 Aero Kombi Cosmic Blue
2000 9-5 SE sedan, Imola Red
1990 900S Rose Quartz, Auto
Past:
1999 9-5 LPT Combi
1999 9-5 LPT sedan
2002 9-5 Arc
1990 900 5-speed
1986 900 turbo Convertible
1991 9000 turbo
1980 99 GLi
1986 900 turbo
1986 900 S
1991 900 turbo
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1976 99 GL
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