Turbo Project update. The good, bad and ugly.

[Dave Zug]

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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