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Bigger tires and downshifting

Discussion in 'Wheels & Tires' started by Krazie Sj, Oct 14, 2009.

  1. Oct 14, 2009 at 11:12 PM
    #1
    Krazie Sj

    Krazie Sj [OP] Resident Jackass

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    Power Serge
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    So I went from 255x60x16 to 265x75x16 and now on my 180mile drive to work I noticed my truck downshifts on some really stupid small inclines as well as the big ones. I don't doubt that my truck may be putting out less power due to antifreeze in the gas, but this is ridiculous. I'm pretty sure I'm getting better MPG due to the larger tires, but I'm curious as to whether or not the truck will remap itself to make it more efficient and powerful with the larger tires.

    Possibility or complete bullshit?
     
  2. Oct 15, 2009 at 4:22 AM
    #2
    Brunes

    Brunes abides.

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    You might have to pull the neg lead off the battery to get the ECU to forget the old shift points.

    I kinda doubt you are getting better MPGs tho....But I'd be interested to see your numbers when you get them.
     
  3. Oct 15, 2009 at 8:08 AM
    #3
    Janster

    Janster Old & Forgetful

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    You're overall RPM range will be lower with the larger tires.... which I'm guessing is why the truck is downshifting.
     
  4. Oct 15, 2009 at 11:54 AM
    #4
    Krazie Sj

    Krazie Sj [OP] Resident Jackass

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    I do a lot of highway, so I'll get better cruising with the slightly bigger tires than I did with the smaller ones. (Although with the smaller ones my truck MOVED. Fast.

    Correct, it's not much but it's still there.
     
  5. Oct 15, 2009 at 11:57 AM
    #5
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    You put the antifreeze in the gas this time? Didn't you learn the first time?












    I keed, I keed, :drevil:
     
  6. Oct 15, 2009 at 12:07 PM
    #6
    Krazie Sj

    Krazie Sj [OP] Resident Jackass

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    You know what I mean you fart knocker.
     
  7. Oct 15, 2009 at 12:08 PM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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