Results 1 to 15 of 39

Thread: '94 LT1 F-Body/ $EE tuning change for '95 transmission (PWM)

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    84

    '94 LT1 F-Body/ $EE tuning change for '95 transmission (PWM)

    I created a thread on the TunerPro forum last fall but thought it might get more eyes here:

    Posted last fall:
    Need to know what I need to add or change for adding control of the PWM solenoid for a 95 4L60E in a 94 PCM. I already ran an extra pin from trans case connector ("U") to blue connector "C", pin 6.

    I had the PCM re-flashed by a reputable tuner in the southeast US. They said it'd be re-flashed with "95 base code" to handle the 95 trans in a 94 car (didn't know it was a 95 PWM trans, was there when I bought it 900 miles after installation of it) I want to make sure what I should see if this is so is there. Mechanically, it's all correct, but I still have no TC lockup or 4th gear.
    And an update from today (moved to a place where I can wrench almost every day!)

    07-20-16:
    I finally pulled the tune from the PCM after some troubleshooting connections to power the ALDL cable. I'm not sure what I'm looking for in TunerPro, but I sorted by parameter category to focus on transmission. I can't see anything that looks like PWM where I expected to see it under Torque Converter Lockup (TCC). I'm starting to doubt that the base tune I have is actually 1995 code. I cleared the code 84 and it came right back. I have a quick disconnect for the wire from PWM solenoid to case connector U on the trans. When I disconnected it I also got a code 83, which went away again after I reconnected the PWM/ Pin U wire.

    Maybe find a known 95 auto BIN and look at it to tell? I don't know at this point. If that's the answer I could merge the BIN I have with one that's a known 95 to transfer the mail order tune parameters to a known 95 BIN. Tedious, but one way to do it, I guess.

    .bin file and change log uploaded (I updated a couple of things that needed it while I was at it.

  2. #2
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,008
    tunerpro has a bin compare function, perhaps compare your bin to a factory '95 cal? i maintain a large archive of bin files at http://fbodytech.com/bin-files-2/bin-files/

    there's a guy here that has gone from a '94 trans to a '95 trans and knows all the tricks. i think it might be brian. he'll probably chime in soon, i don't know much bout autos...

    i bet the 'mail order tune' is pretty minimal too, you could pull the calibration ID from that bin and maybe compare with the stock one and see what changes are made

  3. #3
    Fuel Injected!
    Join Date
    Mar 2015
    Posts
    84
    Quote Originally Posted by steveo View Post
    tunerpro has a bin compare function, perhaps compare your bin to a factory '95 cal? i maintain a large archive of bin files at http://fbodytech.com/bin-files-2/bin-files/

    there's a guy here that has gone from a '94 trans to a '95 trans and knows all the tricks. i think it might be brian. he'll probably chime in soon, i don't know much bout autos...

    i bet the 'mail order tune' is pretty minimal too, you could pull the calibration ID from that bin and maybe compare with the stock one and see what changes are made
    I did a compare against a common bin out there (95 A4 z28 3.23) and saw across the board differences in the TCC vs. xyz tables. Not sure what else makes the difference, don't really know what I'm looking at with auto trans parameters or where the differences are between 94 & 95 in regard to using PWM to do the TCC apply strategy.

    This car has minimal mods- Moroso CAI, Pacesetter offroad headers, 3" X-pipe to 2.5" reduction off the back of the x to 2-chamber Flowtech Afterburners dumped at the axle. The mail order tune didn't even seem to adjust the O2 relocation stuff and missed a couple things in actually disabling EGR and AIR (just turned off codes). Tune was stated to have "adjusted the line pressure and shift firmness." I didn't get into the timing tables to see if anything was improved there.

  4. #4
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    1,022
    The info in Tunercat says the bin is from a 94.

    Attachment 10802

  5. #5
    Fuel Injected! jthompson122183's Avatar
    Join Date
    Jun 2014
    Location
    ohio
    Posts
    185
    the bin is indeed 94,calibration id 16202131. Attachment 10803 from fbodytech.comAttachment 10809
    the big difference is the addition of the tcc apply pressure(pwm) for 95
    but whoever did the tune used the 95 changes in the bin.

    in the 94 calibration these are 0 in the tables and some other parts of the bin. the tuner changed these to what the 95 has.
    yours is Attachment 10804
    factory is Attachment 10805

    the only operating system difference between the 94 and 95 is at subroutine 4db2 on tside chip Attachment 10806

    looking at ida here is the os subroutineAttachment 10807



    i've attached the factory 16202131 calibration

    hope this helps you out

    Jonathon
    97z28 A4 obd1 swap(16188051)
    Tunerpro Newbie

  6. #6
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    1,022
    Remember that Tunerpro and Tunercat both use definitions to map the bin. There are 2 tables for PWM control - PWM Apply Rate and PWM Release Rate. CATS or Tunerpro definitions can map these table areas and still be used for any year of bin. But, if the bin doesn't have the 95 PWM code Jonathan pointed out then the mapped areas are not legitimate tables and changing them does nothing useful. In 94 they are not really a table but rather just empty blank space on the chip.

    That compare Jonathan posted shows the tuner attempted to turn a 94 bin into a 95 bin, which doesn't work as you now know.

Similar Threads

  1. Replies: 22
    Last Post: 10-25-2021, 05:19 AM
  2. Some LT1 4L60E transmission tuning observations (8051)
    By sherlock9c1 in forum GM EFI Systems
    Replies: 17
    Last Post: 05-30-2021, 05:54 PM
  3. Replies: 0
    Last Post: 05-23-2016, 04:04 AM
  4. $ ee automatic transmission tuning
    By steveo in forum GM EFI Systems
    Replies: 0
    Last Post: 01-28-2016, 07:04 AM
  5. Transmission tuning...
    By Six_Shooter in forum GM EFI Systems
    Replies: 12
    Last Post: 10-05-2013, 11:03 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •