Tire size change alfaOBD

Discussion in '4th Gen DIY' started by Redheadhunter21, Nov 9, 2018.

  1. Redheadhunter21

    Redheadhunter21 Senior Member

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    Quick write to help with this. However I bear no responsibility for any changes that you might not like. Only ones you do.

    Start off with key in run.
    Open app
    Select dodge/ram button, Ram 1500 or 2500 From drop down, Body Computer, then body computer MY2013-2017
    Connect then click on the icon at the bottom with the hood open
    From the drop menu select "Program tire size"

    Right above start on this page is a text box that allows you to input the tire circumference in mm or you can use the drop menu to select a preprogrammed size. (Best way to get your mm number is to measure mounted height and then do your conversion, always round up or down to a whole number. This might take a couple adjustments from that to get perfect at 60.)
    IMG_0174.PNG

    Press start and it should take a couple seconds to complete.
    Once done back out to main page.

    Cycle the key, at this point you can get all kinds of lights on the dash, so then you need to do the abs module.

    Now select dodge/ram button, Ram 1500 or 2500 From drop down, ABS, then ABS Ate/Continental
    IMG_0173.PNG


    Connect then click on the icon at the bottom with the hood open
    From the drop down select ABS iniatiliazation
    IMG_0172.PNG

    Read the instructions

    IMG_0171.PNG

    Go back to the drop down and select static ECU initialization
    Press start and wait to complete
    Click on the check engine icon and clear faults
    Then cycle key
    Click back on the car icon
    Select clearing Rolls Information from drop down, then start
    After complete clear faults in the Body control module and the engine.
    Cycle key
    Once complete start your ram and take it for a spin, and check speed vs a gps. If your still off you can redo the process and adjust as needed.

    This was performed on a 2018 Ram 2500 with version 2.1.4.0 on a android with OBDlink MX and a bypass cable

    If anybody has noticed any differences on their vehicles or has any input to edit this let me know.
     
    Last edited: Jan 5, 2019
  2. WTM75

    WTM75 Senior Member

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    Nice write up!
     
  3. gypsy400

    gypsy400 Senior Member

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    I didn't even know there was such an app.

    What do you use to connect to OBD2?

    Sent from my SM-G903W using Tapatalk
     
  4. JB1

    JB1 Senior Member

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    jasonjoyal82, Ghost_RAM and McBroom like this.
  5. Redheadhunter21

    Redheadhunter21 Senior Member

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    https://www.scantool.net/obdlink-mxbt/

    Here's the link to what I used
     
  6. McBroom

    McBroom U.S.Marine Veteran Retired 88-2000 Military

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  7. JB1

    JB1 Senior Member

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    I haven’t tried it yet, but I bought everything needed and just got it all delivered yesterday. I was on the fence about all this but these guys have done all the research and testing of what works so I’m confident in following their lead. I’m going to start off with a few simple upgrades that they have all done and proven to work, then go from there.

    I wanted a Bluetooth code reader so I needed to buy the OBDmx anyway. The Alphaobd APP is $49 so really that’s the only additional cost.
     
    Last edited: Nov 9, 2018
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  8. nick00less

    nick00less Member

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    Was this done on a stock Ram or a deleted Ram?
     
  9. Redheadhunter21

    Redheadhunter21 Senior Member

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    Stock, should not affect a deleted Ram as changes are to the bcm. But you never know, you could always return to stock then change the tire size, then reload your tunes.
     
    nick00less likes this.
  10. Ghost_RAM

    Ghost_RAM Senior Member

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    @Redheadhunter21 Linking from OP in Alfa thread if you don't mind. Great write-up!
     
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