Turbo Project update. The good, bad and ugly.

[Dave Zug]

MAYBE just a misfiring / unburnt fuel problem?  the knock counts are from
the racket the turbos caused when playing dragon.

----- Original Message -----
From: Jon Fedock <Galadar at worldnet.att.net>
To: gmecm <gmecm at diy-efi.org>
Sent: Wednesday, January 31, 2001 5:51 PM
Subject: Re: Turbo Project update. The good, bad and ugly.


>      There was no audible knock that I could hear, however there was
> "machine gun fire" from the exhaust when it went lean (open exhaust about
> 2.5 ft beyond turbo). People watching said the fire was pretty :). I was
> watching the scan tool (OTC 2000 thanks again) when it happened.
Performance
> had fallen off somewhat just before, thats why I was paying particular
> attention. The knock sensor has been tested using a soft hammer on the
> intake. Shows one count. Thanks for your input.
> Jon
>
> ----- Original Message -----
> From: Dave Zug <dzug at delanet.com>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, January 31, 2001 2:05 AM
> Subject: Re: Turbo Project update. The good, bad and ugly.
>
>
> > Heres what I know. (read: what I have read, and recall)
> >
> > 1.  6-8 knock counts is nothing over a 2 second period.
> > 2.  Don't trust the scan software to accurately report ANYTHING
important,
> > specially as it relates to time.
> > 3.  6 knock counts recorded can be deadly, if your knock sensor is not
> > sensing knock properly.
> > 4.  Item number 1 is more troublesome if your knock was audible, and
> lasted
> > the enture time (2 sec)
> > 5   I beleive severe knock will be indicated by a drastic timing change
> for
> > a single count, rather than multiple counts per se. Multiple counts can
> > produce a minor timing reaction if the strikes are minor.  look in your
> > recording for max timing removed.
> >
> > If you get ZERO knock counts commonly, I might suspect too much teflon
> tape
> > or incorrect netres, or incorrect knock sensor... and consider 6 counts
to
> > be bad.
> >
> > 9.  forget all that and go read thrasher engineerings entire site!
> >
> >
> >
> > ----- Original Message -----
> > From: Jon Fedock <Galadar at worldnet.att.net>
> > To: gmecm <gmecm at diy-efi.org>
> > Sent: Tuesday, January 30, 2001 7:21 PM
> > Subject: Turbo Project update. The good, bad and ugly.
> >
> >
> > > Hello Group,
> > >      Just an update on my progress to date with my turbo project.
> > Background
> > > info: 350 chevy motor out of '74 van, two T3 turbos, TPI intake, Syty
> > > software running on 730, intercoolers added two weeks ago.
> > >
> > > The Good: 15 psi of boost is VERY good :) :) :)
> > > The Bad: Gas mileage SUCKS in boost! Hooking up is impossible -
> > > no,IMPOSSIBLE.
> > > The Ugly: This weekend the fuel pump went south during a spirited
15psi
> > > jaunt :( I don't yet know if the pistons are hurt. I don't think so,
but
> I
> > > will not know for sure 'till I replace the pump and drive it.
> > >
> > > My question (of many): What is the relevance of "knock counts?" I
guess
> a
> > > better question would be how many knock counts are associated with
> > terminal
> > > damage? A view of the scan tool showed 6-8 knock counts three seperate
> > times
> > > total time about 2 seconds. Under normal circumstances its at 0. Any
> > > speculation appreciated.
> > >
> > > Jon Fedock
> > > www.geocities.com/JonFedock <------Hmmm, need to update.
> > >
> > >
> > >
> > >
> >
>
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> > >
> >
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