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  1. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    8.1 chevelle

    https://youtu.be/_4pcT2mgQ7c
  2. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    There is a ton of torque management. If you have...

    There is a ton of torque management. If you have a stick I would remove all of it. They are horribly de tuned. I removed a lot in my truck but keep some because it is my DD. My chevelle though has a...
  3. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    Yes I am still working with these 8.1s. I am in...

    Yes I am still working with these 8.1s. I am in the process of tuning my chevelle with the highly modified 8.1
  4. Yes it is. I use the MPVI and the MPVI2 to tune...

    Yes it is. I use the MPVI and the MPVI2 to tune those. It can tune the Allison too.
  5. Replies
    4
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    2,329

    I tune 8.1 Vortecs all the time. What are you...

    I tune 8.1 Vortecs all the time. What are you looking for?
  6. Replies
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    888

    Writing tune file

    I tried to write a tune file into the car and it won?t let me because it says the OS is different. Do I need to do a write entire because the OS on the virtual ECU hp tuners supply?s is different.
  7. Also make sure you have enough overlap on the...

    Also make sure you have enough overlap on the cam. Automotive can run less overlap or negative overlap. On the marine side with water injected headers if you don?t have enough overlap water will back...
  8. Post a log with the new tune.

    Post a log with the new tune.
  9. Replies
    2
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    1,081

    You have a lot more air flow now so you need to...

    You have a lot more air flow now so you need to do your VE and MAF. The motor homes have a tendency to break pistons because PE never kicks in. Your pulling a big hill with tons of weight at 14.6 afr...
  10. Mine starts at 12.5 and jumps to 13.5 fairly...

    Mine starts at 12.5 and jumps to 13.5 fairly quickly. Too much fuel will wash the cylinder walls.
  11. I looked at your last log. Your IAC counts are...

    I looked at your last log. Your IAC counts are really high and your commanding 9.5 stioch. Check your after start enrichment. It shouldn?t be commanding that low unless your running e85 or higher....
  12. https://www.ls2.com/forums/showthread.php/24168-Fu...

    https://www.ls2.com/forums/showthread.php/24168-Fuel-Trim-Cell-breakdown-by-MaP-vs-RPM
  13. I believe 20 is an idle cell in open loop. and...

    I believe 20 is an idle cell in open loop. and 21 is decel and 22 is wot PE. These are open loop. If you go closed loop it would be 19. I?m tuning closed loop first.
  14. When you are in fuel trim cell 19 or 18 the ECU...

    When you are in fuel trim cell 19 or 18 the ECU will reference the idle tables. If you are in cell 20/21/22 it will use other tables such as decel, PE, steady state. If you are not in the idle cell...
  15. You need to be in the idle cell to use the idle...

    You need to be in the idle cell to use the idle tables.
  16. Your TPS voltage it too high, you are not in the...

    Your TPS voltage it too high, you are not in the idle fuel trim cell. Your ECU is not running on the idle tables. you need to log your fuel trim cell and lower your TPS voltage until you are in the...
  17. Replies
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    4,156

    I copied all tables it would let me

    I copied all tables it would let me
  18. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    My best mpg mod was a 1/2inch thick piece of...

    My best mpg mod was a 1/2inch thick piece of rubber under the gas petal to keep it from going wot. Lol
  19. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    It not going to make enough impact to help with...

    It not going to make enough impact to help with mileage. If you are searching for maximum horsepower then spend the money, but I wouldn?t do all that for mpg hunting.
  20. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    I run a lot more timing for a non tow tune. Also...

    I run a lot more timing for a non tow tune. Also remove most of the burst knock, have a leaner PE, and lower lock up and shifting. There?s no point to flow the intake, just have the inside plate...
  21. I have a stock 2005 8.1 Allison tune file if you...

    I have a stock 2005 8.1 Allison tune file if you need one. 05 was a year that they changed the TAC and they changed it again in 06. Some 04s got the upgraded TAC though. Let me know if you want the...
  22. Replies
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    4,156

    The ECU is requesting IAC counts so it should...

    The ECU is requesting IAC counts so it should move. If you dout it put your finger over the hole while it is running. From what I?ve seen the 8.1 os won?t drive the IAC.
  23. Replies
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    4,156

    I just looked at your file and I was fighting the...

    I just looked at your file and I was fighting the same issue. Your OS makes the ecu think that you are still a dbw engine. You need to write entire a file from a express van with a 411 and 4l80,...
  24. Replies
    10
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    4,156

    You need to write an operating system from a...

    You need to write an operating system from a vehicle with a factory DBC over the DBW OS.
  25. Thread: 8.1 4l85e

    by 1970ss8.1
    Replies
    51
    Views
    20,777

    Tremec T56 magnum with 0.50 6th. Mcloud clutch...

    Tremec T56 magnum with 0.50 6th. Mcloud clutch and throw out bearing. Hayes 427 flywheel. Ford 9? with 3:00 gear. We engineered it to do 75mph at 1400 rpm.
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