Okay, I've read as many articles as I could find, bought all the equiptment and opened and explored an example of my chip in tuner pro. I've tuned many fuel injected Harleys, but for the life of me, I can't find the fuel maps in the tuner pro software!!!

I've been embarassed to ask for quite some time, but this is a big stumbling block. WHERE are the FUEL MAPS?

 

Simple....there aren't any.

 

Well, you can add or subtract fuel from a few places. I use Tuner Cat so you will have to bear with me on the tables that we TC users use.

In the ECM Constants page you can change the injector flow rate constant to globally add or subtract fuel. If you enter a smaller constant the ECM will add more fuel because it thinks its a smaller injector, do the opposite and it will remove fuel.

There is a table in TC called Base Pulse Width vs Load vs RPM, in this table you can add or subtract fuel in specific load areas vs RPM.

You can also do the same in the MAF sensor calibration tables. I mess with those as a last resort.

For PE Fuel you need to use the PE Tables, called WOT %Change To Fuel/Air Ratio Vs. RPM and a temperature based table called WOT %Change To Fuel/Air Ratio Vs. Coolant Temp. The ECM uses the multiplier in the temp column to add or subtract fuel, changing the temp constant to a larger number will add fuel globally to the RPM table.

There is also a injector offset vs voltage table that you can globally add fuel. I normally do not use this table. Some do when replacing injectors with non GM injectors. Some people have had good luck, and some have totally mucked up their tunes using this table.

And lastly, make SMALL changes, and TAKE YOUR TIME. These days with a few key strokes in the wrong places you can melt your engine down.

 

If you haven't looked at a MAF program before, the Delphi paper here -
http://delphi.com/pdf/techpapers/2000-01-0546.pdf
- details how hot-wire flow sensors work, and the differences in design between
the ('89 & earlier) 8-bit voltage-out sensors and the ('94 and later) frequency-out
units.


Note the MAF-based systems have an exponential transfer function (signal =
flow*exponent ~0.3), compared to the ~linear transer function of a manifold-
pressure design. This is the fundamental reason for the way MAF airflow/BPW
calibration tables are constructed, and also the reason for the decrease of MAF
resolution as flows increase.

Having an idea of how the tables are built may help you re-calibrate them for
a non-stock appplication.

HTH

 

I have tunner pro, but have not started using it yet.I believe the "base pulse width vs load vs RPM is it. Most ECU,s call it "VE" (volumetric efficiency) In the 86 to89 vette (and maybe other years) it is called "LV8", not "VE", according to written material I have read. I agree tht the PE table is flexable and usefull for tunning. I'm not an expert so do more research. Hope this helps.

 

excellent

Thank you sir
Chris Macellaro