[Diy_efi] WOT tuning tool

[Karl Walter]

Hello,

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


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