Turbo Project update. The good, bad and ugly.

[Jon Fedock]

     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.
> >
> >
> >
> >
>
> --------------------------------------------------------------------------
> --
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo at lists.diy-efi.org
> >
> >
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>


----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org