Re: [doc] Auto trans
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Re: [doc] Auto trans





I've got one of Richard Johnstone's shift computers in my car and it
has functioned 100% for the past year.



James


--- In doc-uk@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> Um..... what software? It's a discrete analogue device. Dead
simple, and
> absolutely up to the task from a theoretical point of view, just
poorly
> implemented.
>
> For those who know lectrickery, the system comprises a little
alternator
> driving a load* to give a variable voltage output. The stator of
the
> alternator is moved by the link cable to the throttle spool, so
more or
> less current is generated depending on the position of the
throttle.
> This signal is then fed into two comparators, whose voltage
references
> differ, and each output drives a FET, which in turn drives each of
the
> shift solenoids. When they're both on, it's in 1st, when one
switches
> off, it's in 2nd, and when both off, it's in 3rd. This is why when
the
> device fails, the tranny sticks in 3rd.
>
> * When the full throttle switch is activated, the load is
increased,
> thus dropping the output by predetermined amount, causing the
> transmission to downshift - aka kick-down.
>
> Richard Johnstone has spent a lot of time reverse-engineering the
> governor and has produced several working prototypes utilising
more
> robust modern components. He still drives around in his own car
with a
> little black box and 3-way switch rather than using the governor.
>
> BTW all of the above may or may not be entirely wrong.... or at
least
> wrong in parts.
>
> Martin
>
> Mark wrote:
>
> > Most  Auto-gearbox reconditioners will charge about £350 to £400
to overhaul
> > the software in the box.
> >



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