I'm gonna try this one more time. Again I must say that transmissions
are not
what I would consider my strongest point. I called JET again and they
assure
me that they DO control shift pressures and thay actually increase it by
approx.
7 psi. If they do, then this should increase shift firmness. I'll check
the the
service manuals (outputs from the computer), again tonight.
Frank
> -----Original Message-----
> From: Holloway,Frank T [SMTP:Frank.T.Holloway@kp.org]
> Sent: Friday, July 31, 1998 9:11 AM
> To: 'dakota-truck@buffnet.net'
> Subject: RE: DML: Shift kit update, need more info obviously
>
> Hay Bruce,
>
> I may have given you some incorrect information yesterday. JET told me
> that
> their chips DO modify shift points and firmness. I had no reason to to
> disbelieve
> them. I generally spend my time on engines (and if the trans works,
> don't mess with
> it). I spent some time in the service manuals last night, the only
> thing
> the computer
> does in regards to the tranny is the 3rd 4th (overdrive) upshift and
> downshift and converter
> lock-up. The computer looks at two items to control these, vehicle
> speed, and temperature.
> The above is just a simple activation and de-activation of a a
> valve.No
> line pressure change.
> Normal upshifts and downshifts are controlled by throttle position via
> a
> machanical linkage.
> It is highly unlikely the the modifications performed by JET would
> indeed make enough difference
> in throttle position to change shift points.
>
> Frank
>
> > -----Original Message-----
> > From: Bruce Bridges [SMTP:bbridges@alarismed.com]
> > Sent: Friday, July 31, 1998 7:26 AM
> > To: dakota-truck@buffnet.net
> > Subject: Re: DML: Shift kit update, need more info obviously
> >
> > gene,
> > what mechanisim is used to modify the line pressure via computer?
> Ive
> > checked the 46RE schematic and cant find a PID regulator or any
> means
> > to do
> > this. There is a mechanical (hydraulic) regulator the should "fix"
> the
> > maximum pressure under any condition though... I have missed
> something
> > obviously. The transgo guys will be getting a call...
> > Bruce
> > At 07:25 PM 7/30/98 -0000, you wrote:
> > >While not entirely familiar with how the Chrysler computer controls
>
> > >transmission line pressure, I AM familiar with the way GM does it.
> > The
> > >PCM on most late-model GMs only handles part-throttle line
> pressure.
> > WOT
> > >shifts are not effected.
> > >
> > >That is where shift kits come in. They help the WOT firmness and
> > speed
> > >of the shift, as well as through the entire operating range of the
> > >transmission. Of course, with the mods you make to the tranny with
> > the
> > >shift kit, it is usually recommended you do NOT modify the line
> > pressures
> > >with a computer program, as at part throttle, line pressures tend
> to
> > be
> > >so high that they can cause damage and premature tranny failure.
> > >
> > >Gene Beaird
> > >98 Flame Red CC R/T
> > >95 DGGM Impala SS
> > >
> > >>The JET (both Stage I & Stage II) chips do firm up the shifts and
> > change
> > >>
> > >>the shift points. Don't no know about the rev. or top speed
> > limiters,
> > >>give them a call.
> > >
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:09:17 EDT