[Diy_efi] 4L80E into 6.2 diesel application

[Ray]

Start by using a comparator to compare the engine speed with some reference.
When the engine is going too fast, shift up.  When it's going too slow,
shift down.

The comparison speeds will be based on engine load, but there will be a
hard-defined maximum speed (a little below redline) and minimum speed
(around idle).  A greater load (vacuum in a gasoline engine, probably
throttle position in a diesel engine) will cause the desired shift speed to
go up.  Reduced engine temperature can do the same.

The "shift up" and "shift down" signals can be fed into some simple
(probably TTL) logic and, if necessary, some driver transistors (2n2222 or
2n3055 -- we're talking low budget here).

Once you're satisfied with the results, build it again with milspec parts.
Or, build a spare and mount the original in the passenger compartment
instead of the engine compartment.


Ray Drouillard


----- Original Message -----
From: <bcroe at juno.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, July 14, 2003 10:24 PM
Subject: [Diy_efi] 4L80E into 6.2 diesel application


> The problem is defining what exaactly the function
> needs to be, and how the trans needs to be wired.
> The circuit design then becomes routine.
>
> Bruce Roe
>
> 14 Jul 03 "Ray" <RayLists at quixnet.net> writes:
> > If you have the pinout of all the connectors, you can probably put
> > together an analog shift computer that uses a few op-amps and some
> > driver transistors.  You will need to send the engine speed and load
> > into the computer.  If you want to have something a little better,
> > adding inputs for things like engine temperature and road speed will
> > help.




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