Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Page 1 of 6 123456 LastLast
Results 1 to 15 of 78

Thread: The ultimate LT1 $$EE patch thread

  1. #1
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432

    The ultimate LT1 $$EE patch thread

    After digging through the code for the last year and define most of the unknown tables, recently I was busy with hardware breakdown.
    I mapped almost all pins on the PCM and for most of them found the software addresses.
    There is alot of unused input pins, AD pins, 1 freq input pins and some output control pins, pwm output pins. It wont be hard to add three more drivers for output control(but still need to find software input for them). There is still some work to do for couple of pins.

    The mystery 3rd processor with mask id D84G, works with conjuction with the main eside processors and is reponsible for 4 freq inputs and knock count inputs. Also makes internal calc for speedometer and possibly drives the spark and injectors relays. It might have its own Rom or EEProm which needs to be read someway. I will be glad if someone can help read the 3rd processor internal memory.

    The patching possibilities are endless and requests are welcome, testers also needed.

    Alot of info to follow

  2. #2
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,399
    i'll help however i can.

    i plan to get eehack program a bit more useful to you in the next release if i have time, with some places for arbitrary mode4 comm requests from both t-side and e-side.

    the code patches i'm most interested in right now are simple, such as open loop idle, i think maybe open loop if tps=0% or open loop if blmcell=16 would be ideal? also dropping charcoal canister purge without disabling blm cells >15 along with it would be useful.

    my personal goal right now that i got that decel crap worked out is to finish understanding the flash routine.

  3. #3
    Fuel Injected! jthompson122183's Avatar
    Join Date
    Jun 2014
    Location
    ohio
    Posts
    181
    anyway to patch for using the 96-97 4l60e?
    97z28 A4 obd1 swap(16188051)
    Tunerpro Newbie

  4. #4
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,399
    anyway to patch for using the 96-97 4l60e?
    that would be an excellent goal - i've been asked this before too, and since i don't care about automatic transmissions much, i haven't come up with an answer. there are solenoid behavior differences of some kind, right?

  5. #5
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432
    Open loop Zero tps patch can be easily done. There is 32 bytes space(it`s used for rear 02 sensor) for that to achieve. Alot of variables can be put in place like timer, map range, or mph range. I will have to think about it. BLM cell cant be implemented because it needs to be in closed loop for cells to be updated. CCP is also doable but the way i see it there is no need for patch, just disable the ccp related errors, disconnenect valve and leave it as is(patch can be made also to save some processor load).

    Pinout for 95 and 96-97 transmission is the same. I suppose it can work with 95 code, but if there is difference in solenoid resistance, that might be a problem. I need to find out what`s the exact difference between 95 and 96-97 solenoids.
    I have been thinking for 98+ls1 transmission with plate and older 4l60 for tcc control.

    What do you think of external switches which can change MAF to speed density or loading second spark table.

  6. #6
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,399
    What do you think of external switches which can change MAF to speed density or loading second spark table.
    definitely a good idea.

  7. #7
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    887
    I'm running a 96 transmission with a 8051. Best I could find was the downshift solenoid is a higher resistance. It doesn't seem to matter because it works fine and didn't throw any codes.

  8. #8
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432
    Initial version for OL zero tps patch.
    Different version for manual and auto.
    Forced Open loop with external switch on pin B23. ground needs to be applied on this pin through light diode and resistor, for visual confirmation.
    Also MAP and MPH check to enable.

    Initial version so use at your own risk.
    Feedback needed.

  9. #9
    Super Moderator
    Join Date
    Mar 2011
    Location
    Camden, MI
    Age
    29
    Posts
    3,026
    Quote Originally Posted by lionelhutz View Post
    Best I could find was the downshift solenoid is a higher resistance.
    less load on the quad/output driver, so I'd say that's not a problem. if inductance of the solenoid changed as well then it may want to be driven at a different frequency, but it sounds like it works as-is.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  10. #10
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,399
    Quote Originally Posted by kur4o View Post
    Initial version for OL zero tps patch.
    Different version for manual and auto.
    Forced Open loop with external switch on pin B23. ground needs to be applied on this pin through light diode and resistor, for visual confirmation.
    Also MAP and MPH check to enable.

    Initial version so use at your own risk.
    Feedback needed.
    awesome, i'll test it (except the auto version, i can't test)

  11. #11

  12. #12
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432
    That`s good to know. Most likely something jumps not as expected. Bad news is, I don`t have access to running vehicle now and debugging will be very hard.
    I`ve been thinking to take new approach. Cell 16 is zero tps, zero mph, cell 17 is zero tps, very low map, cell 18 is zero mph, tps>0.
    Do you want open loop only in cell 16 and keep closed loop in other cells. I want to try to duplicate conditions for OL with the conditions of entering this cells.

  13. #13
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432
    I`ve switched the settings for forced open loop commanded by PIN b23. (in open state I thought it was 0, but actually it`s 1)
    Now is fixed I hope the other part works as expected.

  14. #14
    Fuel Injected! steveo's Avatar
    Join Date
    Aug 2013
    Posts
    2,399
    Quote Originally Posted by kur4o View Post
    That`s good to know. Most likely something jumps not as expected. Bad news is, I don`t have access to running vehicle now and debugging will be very hard.
    i know that story... im afraid to experiment too much with my car since its my only car! but i'll try again soon

    Do you want open loop only in cell 16 and keep closed loop in other cells.
    that would be perfect...

  15. #15
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    432
    Added a new patch. It duplicates conditions for entering cell 16. If all conditions met it goes to open loop.
    This patch depends on CCP functionality in the part of selecting blm cells.
    If, BLM min ccpDC% enable byte_2626 is changed it might not work as expected.

Similar Threads

  1. Replies: 0
    Last Post: 02-02-2015, 05:38 PM
  2. EFI Live E38 VATS patch?
    By dave w in forum OBDII Tuning
    Replies: 1
    Last Post: 04-05-2014, 03:41 PM
  3. $42 hack and hiway lean cruise patch
    By jim_in_dorris in forum GM EFI Systems
    Replies: 73
    Last Post: 05-07-2013, 02:54 AM
  4. Ultimate RPO Codes Complete GM PDF Database
    By EagleMark in forum Fuel Injection Writeups Articles and How to New and Old
    Replies: 6
    Last Post: 12-29-2012, 08:11 AM
  5. Patch Bin From S19 record
    By EagleMark in forum TunerPro Tuning Talk
    Replies: 3
    Last Post: 11-19-2012, 12:59 PM

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
  •