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Thread: 6th getting locked out at high speed!

  1. #41
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    I change it from serial
    to wheel.
    seems to be just the tach signal.
    last night i read something about the tcc.
    someone told that he use the 6th by disable tcc lock . as long as not at wot it works...but I have just not try this.

  2. #42
    Lifetime Member Tre-Cool's Avatar
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    So thread dig again, now that i'm have been building cax files and going through some t43 bin files. I did some testing on 2 of my own cars which are running the same os/cal but have different gear ratio/tyre sizes.

    In short I believe i've worked it out to be an input shaft speed limit for 6th gear of 3757rpm.

    Click image for larger version. 

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    Click image for larger version. 

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    Now just need to find where this value is coming from.

  3. #43
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    Hiya Tre-Cool,
    Do you have the ability to post a .bin file for this t43? If not, can you let me know year/make/model/OS and the 3 other module #'s so I can see if I have one in my archives to look at?

  4. #44
    Lifetime Member Tre-Cool's Avatar
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    T43.0.OS-24256025_2022.08.19_11-58.AM.bin.zip
    T43.0.OS-24254909_2022.08.19_03-08.PM.bin.zip
    Heres 1 of my cars with the 24256025 OS. For comparison i've attached a compatible OS that i normally replace with the 6025.

    I spent some more time playing with 1 of them yesterday and now believe it's an OSS not ISS limit. I'll be pissed if it's some sort of calculation of ISS to OSS for 6th gear lockout as I have no idea how or where to find that.

    To test i changed the vss pickup teeth from 36 to 18 & with the car jacked at the diff, went up to the kick back speeds. Actual wheel speed was half of what was expected along with the ISS. Since it effectivily doubled the OSS speed it hit the limiter at roughly the same 5640rpm'ish drop down area.
    Click image for larger version. 

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    I'm confident it's not a torque value either because there is really no actual engine load to get it up to speed free wheeling. (it's not pushing the car on the road)

    I'm basically looking for rpm's referenced around that area searching in the bin trans segment & blindly testing.... *however it would not suprise me if there is an area in the OS level where they define this limit?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Tre-Cool; August 19th, 2022 at 03:37 PM.

  5. #45
    Lifetime Member Tre-Cool's Avatar
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    So i found the limiter & it is linked to Output Shaft RPM.

    In the 2 os files i have which are compatible, the raw hex value is the same.

    01 00 B0 40 AD 70
    Click image for larger version. 

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  6. #46
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    Hi Tre-Cool,
    I'm not seeing anything RPM related but to me all the tables that do the 6-5 shift are too high, maybe I am looking at it wrong. If you are at a tps and your mph is lower, it will downshift.

    Code:
    	Normal Shift Speed (MPH) Vs. TPS Vs. Shift - 5->6
     
      %TPS      Shift
              5->6   6->5 
         0.0  52.8   49.7 
        6.25  52.8   49.7 
        12.5  52.8   49.7 
       18.75  55.9   52.8 
        25.0  60.9   55.9 
       31.25  69.0   62.1 
        37.5  83.3   65.9 
       43.75 102.5   74.3 
        50.0 116.8   82.6 
       56.25 131.1   96.3 
        62.5 145.4  110.0 
       68.75 159.7  121.8 
        75.0 174.0  135.5 
       81.25 174.0  167.8 
        87.5 174.0  167.8 
       93.75 174.0  167.8 
       100.0 174.0  167.8
    Have a look through this .txt doc and see if you see anything else.T43.0.OS-24256025_2022.08.19_11-58.AM.txt

  7. #47
    Lifetime Member Tre-Cool's Avatar
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    "If you are at a tps and your mph is lower, it will downshift."

    Correct, but if you look at the TUTD shift speeds, the factory generally max's the upshift out but it still lets you control the upshift. same for going down, but it will follow the downshift for once it reaches the lower target.

    so if your in 6th at say 160kph and then accelerate the trans will force a downshift whether your using 100% or 10% pedal input regardless of the value in the shift table as the output shaft speed overrides it.

    I've found the same value/limit in a few other calibrations now too.

    I do have a question that you might know, is it possible to turn a unsigned data input to a signed input & the ecu understanding the change? I'd think not.

    Do you sell these definitions? that is killer! I'd love to get some T43 lovin but it's not really on efi's radar anymore.
    Last edited by Tre-Cool; August 20th, 2022 at 11:58 AM.

  8. #48
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    Hi Tre,
    I am not sure what you are asking(signed/unsigned doesn't bother me, but there are variants). Can you provide an example of an area this is used? I don't have a lot of experience with the t43 or t87 so I am learning as well. Since these are "torque" as well as other inputs, it does get confusing to me.
    Thanks

    p.s. from memory an unsigned is an odd decimal and signed is even(like a supposed checksum or intel type checksum) It's been a while since I did any of this older stuff I like it

  9. #49
    Lifetime Member Tre-Cool's Avatar
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    scrap the unsigned/signed question. i kinda worked it out myself. 10k rpm for instance would never work as a 16 bit integer.

    I was wondering if it was possible to go above the 8192rpm limit.

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