LS1 Lean Cruise

[ae2598 at wayne.edu]

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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