Now that everyone has my HYway spark figgured out and working quite well I have a new question.

After a lot of work an about 200 miles up and down the street in front of my house I have my camper humming very well. Today I ventured out to the hiway where I can get it up to about 65-70 MPH.

Due to the low gearing and heavy weight I am doing 3400-3700 RPM to motor down the road. This puts me into Power Enrichment mode when I get to about 60 MPH.

This is where I could use a little help ot save time on a lot of gas doing trial and error.

WinBin with V8Astro-Captian's 747-mine.ECU file and Tuner Cats have different values for %TPS Vs RPM to turn on PE. And Neither one seems quite right. The Bin calls for 50% TPS to enter PE but I seem to be going inot PE at about 35%

I changed all areas to 85% and it didn't seem to go into PE at alll.

So just what is this scale??????

 

The TPS% scale for the PE table is the bin value * 0.39. This gives a value of 100% for 255 (255 * .39 = 99.5).

The '747 PE mode can seem a bit wacky. There are coolant windows, RPM thresholds, and delays that all come into play. Check the parameters between $D2C9 through $D2D0. There is also a baro ompensation table that adjusts the actual TPS value.

RBob.

 

The question is how it relates to rpm
Win Bin uses 0-3200 rpm (3200 should PE at 102 raw 204 calc volts)
Tun Cat uses 0-6400 rpm ( 3200 should PE at 50% TPS)

It seems to engage at around 32% TPS which doesnt match either one.
Just all kinda confusing, I may just have to do the trial ans error .
Started burning chips 5% TPS apart to see where it all goes.

IS there a "PE flag" I can watch? to make it easier to see exactly when it goes into PE.

 

i dont know about PE mode flag but the O2 voltage should give it away.

 

I believe the "learn control" flag should turn off when you hit PE mode.

 

Thanks for helping me find this mistake. The table at 0x47D (PE enable vs. TPS) was one of the original tables in the ecu file. Like many others, the conversion was wrong. I found in my hack two different ways to convert the decimal numbers...decimal to TPS volts, and decimal to %TPS. Personally I like %TPS so I changed it.

RBob, you are correct once again on the conversion factor. Using the ARJU hack as a guide, I also found .39 to be the correct conversion.

Chop Top, I will e-mail the new ecu file to you.

 

I tried out the new ECU and the position is now readable ( I like it thanx) but I still need help understanding what i am seeing.

I get engage at 32% when it calls for it in the table at 39.8% and the multiplyer Astro Captain added is 1.99 which should double this number. I don't understand this multiplyer at all...

I have been able to move the PE engage around with this table.
So I guess there is really no real problem because I can move it...
I just bias my guess up a littlt bit.

 

The TPS% discrepancy is due to the ALDL & scan tool. The ALDL only outputs the raw TPS value, not the % value. The ECM's TPS% value is derived from the minimum seen TPS (idle) and a scalar term.

RBob.

 

Chop, do you have WinALDL calibrated to your TPS? If not do this:

turn key on (engine off), look at the TPS voltage. Write it down. This is the minimum setting.

With the key still on (engine off) floor the pedal. Make sure you get it all the way down. Now look at the TPS voltage again. Write it down, this is max TPS voltage.

While in WinALDL click the configuration button at the top. You should see TPS voltage for 0% and the same thing for 100%. Put your values in these boxes.

Now it should be close...but I think what RBob is saying is that the ECM calculates TPS% differently.

 

I'll have to get after the calibration. The only thing I have done is to adjust my TPS to read zero position in WinALDL at idle.