Re: [doc] Auto trans

["Mark" <mark@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hmm !  Martin you obviously haven't been in the motor trade that long!!!!

Any qualified automotive engineer would know that software overhaul on an
auto gearbox refers to replacing the clutch plates, brake bands and cleaning
out other items such as valve body, governor, planet wheel & hub. (i.e.
Reconditioned)

Hope this is of help.

Mark Bourne M.I.M.I  M.I.R.T.E  CAE  DiagE

----- Original Message ----- 
From: "Martin Gutkowski" <martin@xxxxxxxxxxxxxx>
To: <doc-uk@xxxxxxxxxxxxxxx>
Sent: Wednesday, June 23, 2004 1:23 AM
Subject: Re: [doc] Auto trans


> 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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