Of course they do. That .bin was probably set up for another application that worked good for his or her desired outcome. You are going to have to retune it for yours. Considerate a starting point. Save it,copy it and tune the copy.
Of course they do. That .bin was probably set up for another application that worked good for his or her desired outcome. You are going to have to retune it for yours. Considerate a starting point. Save it,copy it and tune the copy.
And bluecat 3.42 tables are almost the same as original 3.23 :)
BlueCats is a very helpful tool intended for HP Tuners likely for OBD2 vehicles. Excel is helpful transposing the BlueCat shift tables for OBD1.
Often starting with a factory .bin file that has the 3.42 gear ratio is a good plan.
I use TunerCats for OBD2, not HP Tuners.
For an experiment, I changed the gear ratio of a 1996 Buick Roadmaster to 3.42 gears. TunerCats changed a total of 25 parameters. The .txt file of the changes is attached. Likely a factory .bin file with 3.42 gears will NOT require all 25 changes listed in the attached .txt file (assuming same tire size)
96 Roadmaster 01.jpg
96 Roadmaster 02.JPG
96 Roadmaster 03.JPG
96 Roadmaster 04.JPG
Saying 25 parameters is a little misleading because for every table listed it would have scaled every data point in that table. 100's of actual data points get changed.
Did you check that you had the RPM and tire size/diameter correct in the Engine/Drivetrain box in Bluecat? That can make a big difference.
Remember that Bluecat doesn't duplicate stock tables, it uses calculations to create new shift curves.
Whatever you do, don't go changing the maximum line pressure scalar unlike what you might run into reading how to tune your transmission on the internet. The PCM is coming up with a number between 0-96 and then using that to look up the force motor current in the force motor current tables. Since 96 is the highest column, you want to leave it at 96 to limit the calculation to 96.
You mean you guys don't tune OBD1 shift tables just by doing math on tire diameter, gear ratio, and desired RPM? Have I been missing out on a shortcut all these years?
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
Yes, misleading.
Pictured below is a compare of OBD1 $EE .bin files 3.42 vs. 3.23 The OBD1 compare is showing 4402 differences, not all the compare differences are transmission, and some of the compare differences are undefined. Tables shown have "Compare On".
Possibly using the 3.42 .bin file as the starter tune is a good plan?
3.42 vs. 3.23.jpg
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