[Diy_efi] "reading" a turbo (as you might read plugs"

[john]

are you running leaded race gas?

j


----- Original Message -----
From: "Stephen Webb" <swebb at netlab.uky.edu>
To: <Diy_efi at diy-efi.org>
Sent: Wednesday, May 01, 2002 1:01 PM
Subject: [Diy_efi] "reading" a turbo (as you might read plugs"


>
> I have had the wonderful opportunity to take my wastegate off of my turbo
> (downpipe stud broken off in the wastegate housing).  I noticed the
> wastegate "swingvalve" and the turbine both were somewhat
> discolored.  It's a light grey/white powdery looking "coating", though it
> doesn't seem to rub off readily.
>
> I have some pictures (about 250k each, I think) if anyone cares to look:
>
> http://web.qx.net/lizjones/t3/
>
> It was hard to get a picture of the turbine as the turbo is still in the
> car and not very accessible.
>
>
> A few notes:
>
> 0.  I'm not even sure if you can "read"  a turbo like you can read plugs,
> but I figured I'd try.
> 1.  Turbo was coated with "Jet Hot" coating.  Mostly on the outside, I
> presume, but there was definitely some on the inside as well.
> 2.  Turbo has about 1000-2000 miles on it since the rebuild/jet hot.
> 3.  Car runs very well, and it always seems to run a bit rich, and never
> lean (As per my cheap-o narrow band POS gauge.  No flames please)
> 4.  I believe I am running with my timing retarded right now.
> 5.  I know internal wastegates suck.
>
>
> I mention the Jet Hot because some parts of the turbo may appear to be
> very discolored when in reality it's just the coating.  And secondly, I
> figured that maybe the white powdery coating on the turbine / swingvalve
> was from the coating coming off perhaps.
>
> ------------------------------------
>
> While I'm at it, (and while the list seems to be on the subject of
> traction control):
>
> Can anyone point me to a resource that explains how the Quaife
> limited slip differential works?  I've read / looked at the product
> literature, but I haven't really been able to follow it (not enough detail
> for me).
>
> I finally bought one for my car - mostly because I want / need one now,
> but I was really hoping that once I had it in my hands I could figure it
> out.  I was too chicken shit to open it up, so I'm left wondering.
>
>
> TIA
>
> -Steve
>
>
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> Diy_efi at diy-efi.org
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