LS1 Lean Cruise

[Bruce Plecan]

Why not both the EPA and GM?.
Haaaa,
we would have them just terrified
Bruce

----- Original Message -----
From: <ae2598 at wayne.edu>
To: <gmecm at diy-efi.org>
Sent: Thursday, December 07, 2000 11:01 AM
Subject: Re: LS1 Lean Cruise


> Is this an ongoing court case?  Does anybody have any info on the legal
> battle?  Maybe all of us on the list should unite and start a class-action
> lawsuit against GM :)
>
>  On Thu, 7 Dec 2000, Bruce Plecan wrote:
>
> >
> > By Federal law it was supposed to be availble public domain, in 81,
> > needless to say lawyers will get their 20 years retirements on tieing
this
> > up in court.
> > Bruce
> >
> > > Ah, the 'ole EPA. By making it a separate function,
> > > it is kept out of the IM240 loop. Clever. Makes
> > > sense now.
> > > BobR.
> > > Gee, be nice to have source, wouldn't it? Anybody
> > > here work for the EPA? <g>
> >
> > > >I'd suspect two things:
> > > >It was again a patch job, someone had an idea way late in th program,
or
> > one
> > > >area had no clue about what someone else was doing.
> > > >Or, it was lets try this, and see if we can get away with it.
Figuring
> > if
> > > >one area didn't get approved then another might.
> > > >gotta remember the EPA had the source code, and could look up
anything
> > they
> > > >wanted.
> > > >Bruce
> > > >> I haven't quite figured out why gm kept them separate. When in
> > > >> light cruise, closed loop, it is easy to use the main SA table
> > > >> to give the SA required.
> > > >> When going into a lean fuel mode, additional timing will help.
> > > >> It stabilizes the burn, along with bringing some power back.
> > > >> Only need a couple of degrees (2-3). On my daily driver, I
> > > >> ended up tying the hiway SA and fuel together. Secondary info
> > > >> from the NACA site Dave posted supports this. I also had some
> > > >> roughness when at 16.1 until I added a couple of degrees of SA.
> > > >> Then like you mentioned Mark, the hiway afr & sa change with
> > > >> the map load.
> > > >> BobR.
> > > >> >There are two things going on here.
> > > >> >1) Hwy Fuel
> > > >> >2) Hwy Spark
> > > >> >Two separate things.
> > > >> >Hwy fuel is a light load commanded, calculated afr setting.
> > > >> >Kind of like pe, it checks back to 14.7 to one to make sure the
> > > >> >BL and INT are ok.
> > > >> >Hwy spark is a light load commanded spark adder.
> > > >> >The hwy spark is just load and rpm dependant.
> > > >> >The hwy fuel is speed, load, coolant temp and rpm dependant.
> > > >> >(My experience is ONLY on the 89 Vet code.
> > > >> >86-87 code has only hwy spark (As far as I have been able to
> > determine)
> > > >> >Mark
> >
> >
>
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