88h & hi-way stuff

[chetwagner at uswest.net]

Or for those not using an auto transmission, could probably put the 
highway code in that area.  BTW, I am very interested in having a 
7747 with highway fuel for use with my Toyota LandCruiser that is 
used for alot of distance driving.  I wish I new how to rework the 
code.

On 25 Oct 2000, at 21:01, rr wrote:

> 
> No such luck. However, if you do not mind losing open loop decel,
> it should be easy to add. I'm working on it. I've checked a bunch of
> bins and so far only big blocks use this feature. The problem with the
> '747 is lack of room. If the '747 is used on a non-egr vehicle, a whole
> bunch of room opens up. However, I'd rather come up with a egr
> friendly solution.
> 
> BobR.
> 
> Kevin R wrote:
> 
> > I know I asked this before, but any chance the 7747 has a hiway fuel to go
> > along with the hiway spark?
> >
> > Kevin R
> >
> > >
> > > Here is the info to enable & setup the hi-way spark and fuel
> > > on a mask 88h bin. This mask is used on the '730 powered
> > > 3.1L f-bodys', along with a myriad of fwd 3.1 & 3.4l stuff.
> > >
> > > The way it works is that hi-way spark needs to be present
> > > before hi-way fuel is considered. The user option word at
> > > prom address 0x6B8 has two qualification bits. They are:
> > >
> > > 10h    if set, tcc needs to be locked for hi-way spark
> > > 02h    if set, must be in high gear for hi-way spark
> > >
> > > After that, the following are checked:
> > > ;
> > > ; --------------------------------------
> > > ; HiWay spark quals
> > > ; --------------------------------------
> > > ;
> > >
> > > 0x8088 224 ; max map, 90Kpa (Kpa = N * 0.3125 + 20)
> > > 0x8089 147 ; min coolant (70.25øC)
> > > 0x808A 48 ; min rpm (1200)
> > > 0x808B 2 ; timer, sec's
> > > 0x808C 0 ; timer, sec's
> > >
> > > The next table defines how much spark is added:
> > >
> > > 0x808E  ; HiWay SA table vs. map
> > >
> > > 20    0
> > > 25    0
> > > 30    0
> > > 35    0
> > > 40    0
> > > 45    0
> > > 50    0
> > > 55    0
> > > 60    0
> > >
> > > Hi-way spark values of 0 disable the hi-way fuel. So, set to a
> > > minimum at 1/3 degree of spark.
> > >
> > > The option bit at: 0x6B9, 80h, set to a 1 enables hi-way fuel.
> > >
> > > Once hi-way spark becomes active, hi-way quals are tested. They
> > > are nothing more than the vehicle speed.
> > >
> > > ; 0x872B 48, 50  ; hi-way fuel: mph thresholds, w/hyst
> > >
> > > If they pass, the commanded afr becomes:
> > >
> > > ; 0x872D 154  ; hi-way fuel: afr * 10
> > >
> > >
> > > Have fun,
> > >
> > > BobR.
> > >
> 
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