New Allison Software

[John Suter]

OK David, I've been "baited" - so what was the "quite
worth it" fee?

John Suter
2000LXi


--- David Brady wrote:

> With the upgraded tranny software the economy mode
> is preserved.
> With economy enabled the shift points are lowered by
> 300 rpms. W/o
> economy enabled the shift points are such that the
> engine rpms are
> at or above 1750rpm, within reason of course. With
> economy enabled
> the shift points fall down as low as 1400 rpms. The
> default is still
> performance; economy must be selected by the user,
> and there is a clear
> performance difference to them. I think what
> happened is that many
> customers complained about the shift hunting and
> allison has produced
> a fix. Trust me, the overall performance,
> acceleration in non-economy
> mode, is profound. The "fee" for the hunting fix is
> quite worth it. Plus,
> the shift quality is utter silk. One must truly look
> at the tach to even
> notice
> them.
>
> David Brady,
> '02 LXi, Smokey
> Va
>
> Tom McCarthy wrote:
> > Along the same line, I learned at FMCA that the
> Allison software
> > defaults to a high RPM/Speed shift point for
> better performance in
> > acceleration. On mine, the shift point from 5th
> to 6th is right
> > around 60 mph. The tranny constantly shifts back
> and forth on
> > inclines.
> >
> > If you push the Mode button, the shift points are
> lower and,
> > therefore, more economical for driving distances.
> The 5th/6th shift
> > point is 10 mph lower. No more hunting between
> the two at highway
> > speeds. So, unless you are at Maxton, they
> recommended pushing the
> > Mode button every startup to use the lower shift
> points.
> >
> > Why is it this way? Allison actually had it
> reversed at first.
> > They received so many complaints from RV sales
> people that the
> > diesel engines did not rev high enough to impress
> buyers and the
> > speed off the line was too slow (unofficial inside
> story, not
> > verified and probably will not be confiremd by
> Allison), that they
> > acquiesced to the market. Allison will change
> your tranny to
> > default to the "economic" mode for a fee. From
> David's description
> > of his new software version, they might have done
> that as a default.
> >
> > Tommy "Two Shoes" McCarthy
> > Poway, CA (San Diego)
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, David
> Brady
> > wrote:
> >
> >> Folks,
> >>
> >> While at Smith Power Products in Salt Lake City,
> Ut,
> >> I had the HD4000 tranny reflashed with the latest
> software.
> >> I was running 0C00ABF008N and upgraded to
> 0F00ABF005S.
> >> The first 4 digits are the major number of the
> software. From
> >> 0C00 to 0F00 reflects a 3 level later revision.
> The last 4 digits
> >> are the minor number of the software release. ABF
> means that
> >> identifies the 4000 series transmission. My
> complaint with revision
> >> 0C00 was that it hunted for the proper gear when
> ascending
> >> a hill. She cycled repeatedly thru downshifts and
> upshifts 'till I
> >> tired of it and hit the down arrow to lock her
> into the proper
> >> cog. Not so anymore, with 0F00 she downshifts
> once and stays
> >> there, and the shift points keep the engine at
> 1750rpm or
> >> above. Very pleased! Another benefit is that the
> shift quality
> >> is much improved. The tranny learns how to shift
> by measuring
> >> torque on the input and output shafts, and it
> changes the quality
> >> of the shift by varying the pulse width of the
> hydraulic fluid into
> >> each clutch pack. I can no longer feel the
> downshifts they are so
> >> smooth, the only indication is that the rpms on
> the tach change.
> >> Very pleased! We also did an a engine oil
> (synthetic) and tranny
> >> oil (transynd synthetic) lab analysis -
> everything checked out
> >> well. 70K miles on the LXi and she's just
> breaking in.
> >>
> >> David Brady
> >> '02 LXi, Smokey
> >> Va
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>


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