turbo issues & bypass valve
c a l i b a n
caliban at sharon.net
Sun Sep 9 11:51:51 EDT 2001
is the bypass valve the same as the diverter valve?
On Sun, 9 Sep 2001, Charlie Smith wrote:
]Earlier, c a l i b a n wrote:
]> just what is "surging" anyway? how does it feel?
]> lately i have noticed that when i really get on the gas
]> i hear and feel kind of a rumble from the car. this is
]> a 2k a4 1.8t avant with an APR chip, BTW. the rumble
]> kind of sounds like it's coming from the rear of the
]> car, and like i said, i can hear and feel it. it is
]> pretty subtle and i am pretty sure it subsides a bit
]> once i reach maximum boost. i'mn pretty much just
]> talking about 4th or 5th gear, here.
]Don't really know what that is, but it's not turbo surging.
]> any ideas what, if anything, this might be? is this
]> surging? i also heard from a friend big in the VW
]> scene that there is come kind of valve that wears out
]> in a year or so in chipped 1.8t cars, perhaps this is it?
]What wears out, is the turbo bypass valve. Most common
]symptom is a honking noise when you let off the gas, and
]greater lag when you get back on the gas. There's been a lot
]of conversation about the "best" Audi part number to use
]for this. The topic has been beat to death over on the S car
]list, and the concensus seems to be to use an aftermarket
]bypass valve. I might note, NOT the T.A.P. valve which has
]been reported to lose parts and shred the turbo. I'm using
]a FORGE bypass valve on my S6. I believe I'm using the model
]for the 2.7 biturbo, of course you only need one. Here's
]a URL for this:
] - Charlie
] Charlie Smith charlie at elektro.cmhnet.org 614-471-1418
] http://elektro.cmhnet.org/~charlie Columbus Ohio USA
] 95 S6 Quattro - 24 PSI, RS2 6 speed, and other features
] 96 Dodge Ram - 30 PSI, w/Cummins turbo diesel
rocky mullin - chaotic good
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