What does stoich mean?

[Mark Romans]

I was just speaking to Steve Cole at TTS Power Systems and he was showing me
the LBT spark map on the 99 LS1 engine in the 99 Vet.  He explained the GM
puts 118 octane fuel in and then tests the engine at all load and rpm
levels, putting in more advance until power drops off.  Mapping this gives
you the point at which more spark does not add power.  So barring
detonation, this is max advance that the engine can use.  This map is in the
ecm as a reference barring detonation.
Mark
-----Original Message-----
From: Dave Zug <dzug at delanet.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Thursday, August 19, 1999 10:01 AM
Subject: Re: What does stoich mean?


So if given a choice to either

a) increase spark asvance until (just before) detonation occurs

or

b) decrease fuel delivered until (just before) detonation occurs

economy minded people choose B and performance people choose A?

> From:          JTesta1966 at aol.com
> Date:          Thu, 19 Aug 1999 12:17:01 EDT
> Subject:       Re: What does stoich mean?
> To:            gmecm at efi332.eng.ohio-state.edu
> Reply-to:      gmecm at efi332.eng.ohio-state.edu

> In a message dated 8/19/99 11:42:21 AM Eastern Daylight Time,
> dzug at delanet.com writes:
>
> << ..and for the record, I do NOT want to be running  450Mv at WOT,
>  right? I want 0.890 (safe) to 0.850 (leaner than safe, but mo power
>  here).. yes?
>   >>
>
> You wanna be as lean as possible w/o detonation.....well..on a GN anyway.
I
> shoot for 790-820
>
> Jim
>
>
~~~
Dave Z. www.delanet.com/~tgp