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Speedo help

This is a discussion on Speedo help within the General Help forums, part of the LSx Technical Help Section category; Tires were changed from stock 16" to a 17" speedo is 10mph off how do i fix that stock tires ...

  1. #1
    Junior Member CARHAULIN's Avatar
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    Speedo help

    Tires were changed from
    stock 16" to a 17"
    speedo is 10mph off how do i fix that
    stock tires 245 50 16
    new 315 35 17

  2. #2
    Member Benner's Avatar
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    10mph off at what speed? Your speedo shouldn't be off by more than 1 to 2 mph at 60mph between the 2 tire sizes. They have less than .05 inches difference in overall height so basically the same circumference. Chances are you speedometer was off before you changed tire sizes.

  3. #3
    Veteran 0rion's Avatar
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    yep, the tire calculator says if your speedo says 65mph you're actually going 65.09mph so less than 1mph difference between those 2 sizes.

    You can fix your speedo by getting a tune or with a handheld tuner. What makes you think it's 10mph off?

  4. #4
    Junior Member CARHAULIN's Avatar
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    Speedo off all speeds
    dont know if factory gears were changed

  5. #5
    Member Benner's Avatar
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    take it to a gm dealership and have them check it and fix it. Simplest way to take care of that.

  6. #6
    Junior Member CARHAULIN's Avatar
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    I feel its off because i fly by like
    every one is sitting still
    plus ive followed a few semis i know are govened speed at 62
    and my speed reads 52

  7. #7
    Junior Member CARHAULIN's Avatar
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    Gm dealer told me to buy a
    vss buffer ..
    Would a tranny shop be able to help??

  8. #8
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Trans Am WS6 M6

    Quote Originally Posted by CARHAULIN View Post
    I feel its off because i fly by like
    every one is sitting still
    plus ive followed a few semis i know are govened speed at 62
    and my speed reads 52
    Um...no they're not...I've been with a few semis that are going 70-75mph

  9. #9
    Junior Member CARHAULIN's Avatar
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    All day every day im out there
    i know what companys are and which
    are not. But thank for a reply.
    Stopped at tranny shop tonight they
    said something about a drac modgule being bad
    and to go the dealer??

  10. #10
    Veteran 0rion's Avatar
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    let us know how it works out for you

  11. #11
    We'll be back... GatorSS's Avatar
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    It is simple to correct with tuning software or even a handheld tuner. But first, you need to know what the rear end gear is.

  12. #12
    Junior Member CARHAULIN's Avatar
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    Thanks that seems to be my best option

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