[Diy_efi] WOT tuning tool

[Daniel Nicoson]

Karl,

>>From your discussion below I am assuming that you can change all the
parameters on your ECU? I'm only familiar with the Ford EEC computers, I
tune mine with a TwEECer which allows full control of spark and fuel tables
and much more.

If you use a wide band O2, why can't you just change the commanded pulse
widths in the ECU to handle WOT? Tune the MAF curve or MAP table.  Am I
missing something?

The hardware route you are proposing is a significant step, I've done it on
a sequential water injection system.  It has been a year and a half of hard
work learning all about the electronics and figuring out the circuits etc.
I let the Ford computer run the gasoline fuel injectors per normal but I
also take a signal off each injector line and take that to my secondary
injector controller where I use a delay (variable by dash controller) to
give a shorter water pulse width that ends the same time as the fuel pulse
width.  I run a second "fuel rail" to handle the water/methanol just like a
regular EFI system, using 14# injectors in each intake runner.

I still don't have a turbo mounted so I don't really get full benefit yet
(this was supposed to be a supporting project to the turbo install - I've
been 1.5 years on the secondary controller).  I tested the unit this fall on
the dyno, works fine.  I got a little side tracked and started experimenting
with methanol/nitro trying to up the Hp in NA form.  It snowed before I got
very far with nitro, will resume in March...

I'm currently re-designing the controller to make it more simple, gain some
better control etc.  Project on my web site www.myo-p.com  The redesign may
include the ability to achieve longer pulse widths than commanded by the
ECU, I haven't finalized that part yet.

I would tune your WOT with a WB and change the parameters on the chip if you
are able, much less work, trust me.

Have fun.

Dan Nicoson


-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Karl Walter
Sent: Wednesday, February 16, 2005 1:22 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] WOT tuning tool


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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