[s-cars] Whistling revisited

[brian hoeft]

After I installed the 034 phenolic spacer I noticed a whistle at about 2700
RPM.

Is your post suggesting you now notice a performance issue?

I'd be interested to know if its a constant, or only prior to full operating
temp.  I really only notice the whistle prior to average running temp.

BTW, I wouldnt suggest a phenolic spacer, but had the extra funds and
curiosity at the time.

-brian

On Fri, Aug 20, 2010 at 11:36 AM, Andrew B <andrew.sb at gmail.com> wrote:

> So I've had this problem before, but disregarded it as it didn't seem
> to affect performance at all.  I met with another Scar owner last
> night and realized it isn't normal at all....so here goes:
>
> I have a distinct whistling noise above ~750RPM but before boost
> actually kicks in. I can hear it most with the windows down cruising
> around 2500-3000RPM. It sounds like it's coming from the turbo, or at
> least that side of the engine. The car seems to make good boost, and I
> haven't really noticed any weird symptoms. I initially ignored it
> because when I had my head R/R'd, it came back to me with this noise.
> I can't say with any certainty whether it was there before or not.
>
> Any ideas on what it might be? I don't have the gear at home to
> pressure test, but maybe I can check with windex or soap water to see
> if any bubbles form. My lower IC hose is samco, but the upper one is
> stock. IM and turbo are stock, 135k miles on all. Could it be the
> bypass valve?  Can I test that myself?
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