LS1 Lean Cruise

[Bob Wooten]

i don't recall if it was on this list or not but i just saw that it was
signed into law that the OEM's have to provide the source code for the OBD
II cars.  this being said SEMA is still fighting the battle over the OBD I
car codes.  I am pretty sure that if you really want more information on
this that you can get it @ the SEMA web site.  they are suing the big
Domestic 3.  needless to say, not having the source code for the OBD I cars
yet i am not holding my breath.  

if anyone wants more information on this maybe i can find the Lit. that i
had.

Bob Wooten
 


> [Original Message]
> From: Len Sabatine <sabatine at epix.net>
> To: <gmecm at diy-efi.org>
> Date: 12/7/00 8:36:27 PM
> Subject: Re: LS1 Lean Cruise
>
>     Might Include Daimler Chrysler , FOMOCO and a host of Other OEMs , 
> while you're at it.
>     Associations such as APA and SEMA have lobbied unsuccessfully for 
> decades for release
>     of this information to the aftermarket. Combining forces with other 
> heavy hitters would seem
>     a prudent strategy. Hell may freeze over until the information is in 
> the public domain.
>     Len
> 
> >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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> >
> >
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--- Bob Wooten
--- r71chevy at earthlink.net
--- 71-91 Camaro


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