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Thread: '05 "T" and "Z" motor differences

  1. #1
    Lifetime Member Boost's Avatar
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    Question '05 "T" and "Z" motor differences

    Could someone please tell me the difference between a "T" motor in an '05 Silverado and a "Z" motor in an '05 Avalance? They are both 5.3 and I don't think either has VVT or DOD. Is one Flexfuel? What are the mechanical differences that would affect tuning? I asking because I flashed one of my "T" motor experiments into a "Z" and it runs GREAT, just wondering about the details. Thanks!
    '01 Z28 LS1 / T56
    7.59 @ 94.45 (1/8 mile)
    YouTube channel
    '02 C1500 L59 / 4L60E
    8.24 @ 85.08 (1/8 mile)
    www.lsxnos.com

  2. #2
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    Both VIN "T" & "Z" are iron block 5.3 L Gen III engines. VIN "T" is the LM7 variant. VIN "Z" is the L59 Flex Fuel variant.


    Regards,
    Taz

  3. #3
    Lifetime Member ChipsByAl's Avatar
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    The "Z" engine is flex fuel. It has larger injectors so it can run on E85. It also uses a flex fuel sensor to determine the ethanol content. A "T" engine file cal or full flashed in a vehicle with a "Z" engine would run quite rich.
    Al
    "Trash that carb and get Injected!"

  4. #4
    Lifetime Member Boost's Avatar
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    Thanks for the info! I am guessing its not running rich because I only flashed the script from stock to tune from the "T" engine onto the "Z" cal. Thoughts on this?
    '01 Z28 LS1 / T56
    7.59 @ 94.45 (1/8 mile)
    YouTube channel
    '02 C1500 L59 / 4L60E
    8.24 @ 85.08 (1/8 mile)
    www.lsxnos.com

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