[Diy_efi] WOT tuning tool

[Scott Peitzsch]

> I have been tuning 1227747 ECU eproms for several throttle body injected
> applications with pretty good sucess.  Idle is easy with a CO meter and an
> eprom emulator.  Cruise tunes itself, but Open Loop wot mode is a guess
> and check, with tons of test drives.    A mixture meter on a second o2
> sensor helps, as does datalogging with winaldl, but I'm dreaming of
> something like this:
>  A unit that the fuel injector connectors plug into, and plugs into the
> fuel injectors (i.e. inline)and could scale the pulse width by turning a
> knob.  It could be activated by tps ,and would need to run the comouter's
> output through a resistor, and measure the pulse width, calculate a new
> scaled pulse width, and run an injector driver circuit.
>
> Has anybody seen such a unit?  Could this be done by cutting into the ecu
> just before the injector output stage, and making a scaler circuit that
> feeds at that point?  I have no problem sactificing an ECU To make a
> tuning tool.
>
>
> Maybe a stand alone unit with an extra injector or two, temporarily set up
> to richen as needed.  Wouldn't be able to lean out, but might be helpful.
> Could be made with all off the shelf parts, but would need fuel supply.
>
> What do you think?  --Karl

Sounds to me like you just described a DynoJet Power Commander.
Its most common use is as a tuning bandaid on EFI'd motorcycles, but
you could fairly easily adapt it to an automotive TBI application

-Scott

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