95_lt1_z28

i have a 1995 camaro lt1, recently the pcm got fried and i got my hands on a 1994 pcm. heard these are similiar pcms apart from the torque converter lockup. can anyone give me hand with tuning it? what can i disable or enable so the torque converter can lockup , i am using tuner cats. thanks

shoebox

You'll need a bin from a 1995.

timnfxr

I have a stock 95z28 A4 bin file I can send you. Check your private messages.

95_lt1_z28

thanks shoebox.. thank you , timnfxr i managed to find a bin from a site. now suddenly my speedometer shoots up when the car starts to accelerate and goes back down when i come to a stop. car has 3.42 gears and is calibrated with tunercats. anyone know what the problem could be? thanks guys

Injuneer

Are you sure its an A4 program? If you run an A4 trans (40 tooth VSS) with an M6 program (expecting a 17 tooth VSS signal) the speedo will read aboutt 2.3 X actual speed.

95_lt1_z28

yea if i go on the ecm switch table , automatic trans option is enabled. i can send u the bin file if anything , thanks

Injuneer

I'm not a tuner. Just suggesting a possible source of the problem.

rngilliland

Just because auto trans is enabled in the switch table doesn't mean the speed calibration is correct. A bin from the internet could have been modified. Check under the tools tab, speedometer calibration. The current calibration will be shown and you can make sure it shows 40 pulses per driveshaft revolution. Since you have 3.42 gears you need to calibrate the speedometer anyway. The program will ask if you want to modify the transmission shift tables. In my experience modifying the shift tables works good if this is a stock bin that has never been modified. If the shift tables have been modified before, and you modify them again, you may get some bad values.

My speedometer acted like you describe one time after I flashed a new bin. I never figured out why but flashing it with a different bin file fixed it.

95_lt1_z28

@ Tim, i flashed your stock bin file and the speedo seems to be fine now. cant thank you enough. @ rngilliland thanks for suggesting the idea of flashing another bin... the speedometer scaler was way off

timnfxr

Thanks for the update. I'm glad it was helpful, and corrected your speedo issue.