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Thread: Question about ECU and tire size

  1. #1
    Registered Member Anzi's Avatar

    2002 Protegť5 manual

    Join Date
    Feb 2018
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    SF Bay Area, California
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    63

    Question about ECU and tire size

    So Iím considering putting the Mazdaspeed wheels and tires on my P5, but Iím the type of person to want to have my speedometer and odometer stay accurate. With my Chevy truck, tire size can be programmed in the ECU by a dealer, though Iím unsure if thatís possible for the P5, and one dealer told me it isnít, despite my hearing mixed things on forums. That said, my other curiosity is if itís possible to take an MSP ECU and reprogram the ignition timing and fuel map so it works fine for my NA P5 and runs 87 octane well.

    Any thoughts or insight?

  2. #2
    Registered Member

    Protege5

    Join Date
    Jan 2015
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    Springfield, MO Area
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    You can't program the PCM.

    The MSP wheels and tires are close enough in diameter to the stock setup that there's no need to anyway.

  3. #3
    Registered Member Anzi's Avatar

    2002 Protegť5 manual

    Join Date
    Feb 2018
    Location
    SF Bay Area, California
    Posts
    63
    Someone reminded me of the Yellow Box speedo correction thing, so I can fix it anyway

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