[200q20v] Is it my turbo?
brett at pdikeman.ne.mediaone.net
Sun Nov 19 02:55:47 EST 2000
The Bosch TBV was updated fairly long ago because in Saab applications,
the valve would "hoot."
To fix the problem, they added a metal piece that drastically lowers the
resonant frequency of the valve mechanism. It's visible as a brass ring
if you look inside the valve.
However, I'm not sure why it would happen on acceleration; unless it
failed in some new and exciting way, this fact rules out it being the
cause of the noise.
I remember reading somewhere that automotive turbos are(or were) designed
to be overhauled every 120,000 miles or so. Some listers have strongly
recommended simply buying a reman'd unit, and returning the old one as a
core...rather than getting slammed by an unscrupulous overhaul shop...
On Fri, 17 Nov 2000 WARATAP at aol.com wrote:
> Lately (for the last month or so) under light acceleration as the car vacuum
> boost gauge makes the transition from vacuum to boost, I can often hear a
> sound similar to what one makes when blowing over the top of a soda or
> (better yet) beer bottle. I haven't checked the positive pressure hose yet,
> but my IC does have a copious amount of oil at the bottom of the endcaps.
> Anyone else experience this? I'm still getting 20+ lbs of boost, but maybe
> the bearing is going?
> I'll be replacing the turbo afterrun pump next week (leaking).
> '91 200 with a few mods...130k
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