Lt1 4l60e 3.42 rear end SHIFT TABLES

[yoheer]

Does anybody have decent tables for 3.42 rear end setup?
Are D-body towing package tables good enough for f-body?

[dave w]

BlueCat Transmission Table Software can be found on this link: https://www.camaro5.com/forums/showthread.php?t=548319

The HP Tuner link to download BlueCat is dead but the HP Tuner Thread has useful information: https://forum.hptuners.com/showthread.php?44953-Bluecat-Transmission-Table-Software

BlueCat is useful for Tuning:
Normal Mode Up/ Down Shift Points MPH vs. Gear vs. TPS%
TCC Normal Mode Engage MPH vs. Gear vs. TPS%
TCC Normal Mode Release MPH vs. Gear vs. TPS%

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[yoheer]

Thnx a lot
Im trying to compare Bluecat data with OEM
Original table seems to be more agressive than Bluecat.
What am doing wrong?
Could you please make a picture with parameters for a stock f body.
Any rear end.
It should be like the same i think

[dave w]

Thnx a lot
Im trying to compare Bluecat data with OEM
Original table seems to be more agressive than Bluecat.
What am doing wrong?
Could you please make a picture with parameters for a stock f body.
Any rear end.
It should be like the same i think

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[dave w]

Does anybody have decent tables for 3.42 rear end setup?
Are D-body towing package tables good enough for f-body?

Link to gearhead-efi LT1 information with .bin files too: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?335-16188051-and-16181333-PCM-Information-EE-EEB

[scooterwrench]

I'm pretty new at this tuning game,have yet to burn my first chip. Maybe lower the shift points and turn down the line pressure a little at the lower TPS and MAP areas for smoother low throttle shifts. I wouldn't get too carried away with reducing line pressure,you don't want to burn you clutches. Maybe delay your TCC another .5sec in the same areas.

[yoheer]

3.23 orig vs bluecat normal shift tables @100% throttle
2nd - 36 vs 42
3rd - 73 vs 80
4th -126 vs 133
Won't it stuck in a gear with a rev limiter even with 3.23 gears?

[scooterwrench]

The idea is to keep your shift points in the torque range of your cam. You will have to determine what the RPM's are going to drop down to when it shifts and tailor the shifts so that that you're about 200 RPM's into the beginning of the torque range. You will need wheel speed,final drive ratio and tranny ratios to determine that. It's all about tuning to what [I]you[I]have in your car.
If you're banging the rev limiter before you reach the shift point then yes,it's not going to upshift until you back off the throttle.

[yoheer]

Im just trying to say that tables generated for a stock car by bluecat differ from original tables.

[scooterwrench]

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.

[yoheer]

And bluecat 3.42 tables are almost the same as original 3.23 :)

[dave w]

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):thumbsup:

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[lionelhutz]

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.

[NomakeWan]

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?

[yoheer]

Remember that Bluecat doesn't duplicate stock tables, it uses calculations to create new shift curves.





Exactly what I wanted to hear

[dave w]

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.

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?

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