[Diy_efi] Knock Detection using GM ESC Module

[Programmer]

That's right. A dyno will get you "close"...and sometimes not even close.
<g> The real dynamics show up on the road course or at the track. Things
like:
How the returned oil is moving in the sump, (where is it on decel ?), fuel
movement in fuel tank, lines and bowls, how the airflow is affecting one or
two carbs, how oil is moving in the
transmission--you can't duplicate this on any dyno.

Lyndon

----- Original Message -----
From: "Bruce" <nacelp at bright.net>
To: <Diy_efi at diy-efi.org>
Sent: Wednesday, May 29, 1996 10:39 AM
Subject: Re: [Diy_efi] Knock Detection using GM ESC Module


>
>
> Dynos don't reveal gas pick up problems, in case you haven't actually been
> to a track and done any real world testing.   There can be a host of
> gotcha's when you actually get to a track that no amount of dyno work will
> find.   And poor testing can can miss a host of problems.
>    Without his defining what he considered testing, I wasn't going to
assume
> any facts about about the program.   Unlike where you did assume that the
> testing was perfect.
> Bruce
>
>
>
> ----- Original Message -----
> From: "Garfield Willis" <garwillis at msn.com>
> To: <Diy_efi at diy-efi.org>
> Sent: Wednesday, May 29, 2002 11:35 AM
> Subject: Re: [Diy_efi] Knock Detection using GM ESC Module
>
>
> On Wed, 29 May 1996 11:09:28 -0400, "Bruce" <nacelp at bright.net> wrote:
>
> >No need to.
> >The rig should be shaken down before the race started.
> >Proper testing is what leads to all the luck some winners have.
> >Bruce
> >
> >----- Original Message -----
> >From: bill.shurvinton at nokia.com
> >Subject: RE: [Diy_efi] Knock Detection using GM ESC Module
> >Tricky to do during a fuel stop in an endurance race though :-)
> >
> >-----Original Message-----
> >From: ext Bruce [mailto:nacelp at bright.net]
> >Subject: Re: [Diy_efi] Knock Detection using GM ESC Module
> >Learning how to read plugs is the only true answer
>
> Here's another example in as many days. The guy said, AND I QUOTE
> verbatim,
>
> >The engine ran fine on the dyno and in testing ...
>
> But you just *had* to imply the whole team was stupid or lame, and
> didn't "shake down" the engine prior to race day. Like I said before,
> read the friggin post before you rag off at the mouth. These guys have
> just suffered a significant loss of time, effort, and expense, and all
> you have to say is to shoot from the hip (or should I say the groin)
> inspite of contraindications is, "improper shakedown". What an ass.
>
> Even human bodies do this sometimes; it's called a TIA or "transient
> ischemic attack", where an artery gets clogged temporarily, and then
> opens back up, so you can't find the clot with any instrumentation
> means. The guy probly has a floater (a loose fuel obstruction), one of
> the most difficult fueling intermittents to find. This is a major
> exposure in aircraft fuel systems as well, unlike street vehicles, since
> you have MAJOR fuel motion in the air or in a race car. Just one of the
> several cases where REAL incipient knock detection would be worth it's
> weight in gold, especially if it really is caused by a fueling
> occlusion, since it's onset is often preceeded by gradual enleanment
> from fuel starvation, where you creep up on the detonation slowly (well,
> slowly in 'engine time').
>
> Gradual approach towards conditions of detonation can be detected with
> only two techno's so far: (1) direct combustion pressure sensing, and
> the sensors had better be VERY fast, which means lotsa $$, or (2)
> ionization current detection, which is inherently high-speed and can
> pick up incipient knock better than even pressure transducers.
>
> Those of us not wishing to sit back on our silly laurels of
> after-the-fact palmNplug-reading, can look forward to at least TWO
> different vendors, one of them a major motorsport retailer (ask me how I
> know :) finally bringing out affordable ionization detection products to
> the low-end (read, on a budget) proformance/motorsport market later this
> year. I'm talkin $100s not $1000s.
>
> Once that's available, you can kiss these armchair hipshooters a fond
> sayonara, baby; at least on the subject of detonation
> detection/prevention.
>
> Oh BTW, nuthin wrong with reading plugs; nuthin wrong with reading the
> Reader's Digest when you're on the can, either. Snort.
>
> Gar
>
>
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