...change speedo pulses? Meaning, do I HAVE to by a SGI-5 box to convert signal because of my T56 swap, or can I manipulate the signal somehow through Tunerpro?

 

i don't know about the 89, but on the 91 if it still has the 7730 ECM with 8d mask, yes.
in TunerPro look in Constants/Scalars for "VSS, Speed Sensor Pulses".
changing the pulses per mile will change the speed the ECM sees/outputs.

 

Yeah, that is what I figured, but when looking through the scalars, the only thing that has anything to do with the VSS says "DFCO Disable low speed VSS speed limit".

7730 ECM using 8D.

 

Try a different XDF, also look in tables.

 

You'll have to forgive me, I'm pretty ignorant when it comes to using the TP. Just deadly enough to mess something up.

Nothing in the tables either.

Using the tune that my tuner emailed to me, I select the XDF with the label "6E.xdf" and open the BIN he has created. Under the "Mask ID" in the scalars it says it's an 8d mask.

With that said, when you say use a different XDF, what are you telling me to do? Do I need to download it from TP's site? Is it going to be able to modify my existing tune?

 

the 6E.xdf is for the 165 ECM that your two 89 cars use.
for the 91 with the 7730 ECM you need to get the right def files and load them into TunerPro.


go to Moats file manager and sign in.
https://www.moates.net/
on the left side look for "File Uploads and Downloads"
to access the file area, you'll need to setup an account if you don't have one already.
its free to setup an account to get into the file area.

then look for,
2) User-Contributed ECU Files
now find these 2 files and download them. use right click and then "save as" and save them to your hard drive.
one, if not both of these 2 files should have the setting you need listed.

1227730_8d.ecu
super 8dm2.ecu

once you have them on your hard drive, find and rename them both by removing the ".txt"

at this time i recommend moving these 2 new files to the "Bin Definitions" folder in TunerPro.
now open TunerPro.
click the "XDF" tab and then "import" then "from ecu" and select "super 8dm2.ecu"
now looking in "Constants/Scalars" you should find "Vehicle Speed Sensor" down near the bottom of the list.

the reason for getting both files is because each file is a little different.
when i started chip tuning, i used these 2 def files for editing the bin.
it seems like i may have also used one other bin def file, but i don't remember right now.

while in file manager at Moates, go to "4) Datastream Definitions" and find
"FIRST THRID GEN 1227730.ads"
this is a good data stream file and was what i used most of the time for data logging.



once your comfortable using the above files, you may want to look into the following.

S_AUJP_V4 1024.zip
S_AUJP_V4 Inputs.zip
S_AUJP_V4_1026.zip
these are the most expanded files for the 7730 ECM using the 8D mask.
before you try them, look for the threads on S_AUJP_V4 by JP86SS and read them carefully because there are some changes that have to be made to the files and also because not everything works the same as the other older def files.

 

To further confuse you, the VSS PPM parameter in the calibration will only affect the ECMs internal MPH calculation. It won't change the pulse streams that the ECM creates to the speedometer and cruise control.

The VSS PPM parameter at location $15 in the PROM is the one for the internal MPH calculation.

Need to change the instrument panel divider value at PROM location $14 for the output streams. The divider bits are the 3 high order bits (7, 6 & 5). And ONLY change/set those, otherwise you will be changing other items in the ECM hardware.

Note that the two above parameters are ONLY available when using the magnetic VSS input to the ECM. Which in your case is OK as that is what the T56 provides.

RBob.

 

Whew. Ok. So it can be done, but I may be pulling my hair out by the time I figure it out. Thanks for the help guys. I'll probably be back on this topic once I get to that point. Still need need to finish the swap and get a new mid pipe built.