Thread: tcc engages at ~93*F. is this pcm controlled?

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  1. #1 tcc engages at ~93*F. is this pcm controlled? 
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    just noticed lately with my setup: 3.29 gearing, GM auxilary trans cooler, and 180* t-stat. th weather's been no higher than 40*F and i recently noticed my tcc wont engage until it reaches ~93*F according to my LS1M. i was told from a few others that their tcc engages at other temp ranges such as 70*F but i dont know if they were using a trans cooler or not and the trans fluid heated up quicker than mine. also on days where the ambient temps were above 40*F(which is rare since its still winter) i noticed my TCC wouldnt engage until roughly 110-115*F. anyone know why? trannyman? anyone? i havent paid attention to where my engine coolant temp(ect) was at when my trans temp reached 93*F or at 110-115*F. so is this PCM controlled or just how the fluid is being circulated based on the temp of the fluid or a little bit of both?
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  2. #2 Re: tcc engages at ~93*F. is this pcm controlled? 
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    There is a minimum trans temp for lockup to occur in the PCM... 93*F seems a bit high from all the stock values I can recall... Most are 20 or 25* C (68 and 77*F)...
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  3. #3 Re: tcc engages at ~93*F. is this pcm controlled? 
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    yea i was thinking the same. however since im running a trans cooler, the additional pathway might take longer for the fluid to reach 68-77*F along the way somewhere depending on where the pcm picks up the trans temp and the other area its already reading 93*F or warmer. thats one theory anyway.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  4. #4 Re: tcc engages at ~93*F. is this pcm controlled? 
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    Hmm. Highly possible it takes longer.

    Curious, what year of car do you have? The setting might be at the higher 25*C and could be lowered to the later lower stock value of 20*C.. You have access to a tuner?
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  5. #5 Re: tcc engages at ~93*F. is this pcm controlled? 
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    my car's a 98 gtp. i do have a powertuner but it doesnt show any tables that involve when the tcc engages on a cold motor. i also looked into a program a few members on CGP put together called tiny tuner that has access to a few other tables the powertuner doesnt include but unfortunately doesnt show any tables regarding this particular issue.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  6. #6 Re: tcc engages at ~93*F. is this pcm controlled? 
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    Hmm. Yeah, it wont be in PowrTuner or HPT yet. Might be in latest version of tiny tuner database.. I have it in my copy of TinyTuner database as I work with Eddie and a few other guys on the db..

    A 98 GTP pcm/bin will have a stock value of 25*C required before the tcc will lockup.. Let me know if it is in the copy of TinyTuner you can get.. If not, it should be in a release shortly if eddie updates the download.. I could change the value for you to if needed. I changed my 97 from 25*C to the lower stock value of 20*C seen in later years.
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  7. #7 Re: tcc engages at ~93*F. is this pcm controlled? 
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    bilemke, its not in my version of the tiny tuner. any chance u can email me the latest version and under what folder it is in? my email's ftcheou@gmail.com
    thanks bilemke =)
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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