Speedo problem
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This is a discussion on Speedo problem within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So this is a consistent problem. I have an 04 STi and the speedo is consistently off by 5 mph. ...

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    Registered User khmer04sti's Avatar
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    Speedo problem

    So this is a consistent problem. I have an 04 STi and the speedo is consistently off by 5 mph. I've checked tire pressure and the tire treads look fine, but still off by 5. Any ideas as to why this is occurring? I've checked some threads and all I've found are speedos that don't work. Thanks in advance.

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    Administrator RayfieldsWRX's Avatar
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    Registered User wrx wagone's Avatar
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    How are you checking your speedo?

    Rarely is a stock speedo accurate anyway.
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    Registered User khmer04sti's Avatar
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    Quote Originally Posted by RayfieldsWRX View Post
    Are you running the stock wheels?
    Yeah, I'm running off the stock tires.

    Quote Originally Posted by wrx wagone View Post
    How are you checking your speedo?

    Rarely is a stock speedo accurate anyway.
    I know the stock speedo isn't the most accurate, but 5mph is a bit much don't you think?

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    Administrator RayfieldsWRX's Avatar
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    Quote Originally Posted by khmer04sti View Post
    Yeah, I'm running off the stock tires.
    I know the stock speedo isn't the most accurate, but 5mph is a bit much don't you think?
    Depends on what speed range we're talking about. Is it 5mph off when you're going 20mph, or 70mph?
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    Registered User wrx wagone's Avatar
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    Quote Originally Posted by wrx wagone View Post
    How are you checking your speedo?
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    Registered User khmer04sti's Avatar
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    Quote Originally Posted by RayfieldsWRX View Post
    Depends on what speed range we're talking about. Is it 5mph off when you're going 20mph, or 70mph?
    It's a consistent 5 off at any speed as far as I can tell.

    Quote Originally Posted by wrx wagone View Post
    How are you checking your speedo?
    I actually didn't notice it until I was clocked with a radar gun. Then I compared my speed to my brother's dsm and my fiancee's old beater. I was rather annoyed that a 1984 plymouth horizon had a better speedo than mine.

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    Administrator RayfieldsWRX's Avatar
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    Take it to the dealer, and have them calibrate the offset?
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    Registered User khmer04sti's Avatar
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    I'm in Longview, TX for uni. and the only dealership I trust is in Plano

    I talked to a sales rep today and explained the problem. He told me to call them monday since the shop was closed. I'll let you guys know what comes of it.

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    i really cant find a reputable dealership in texas for subaru. ive only been 2 a couple..and they were horrible. send me some feedback on that one in plano
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    Registered User khmer04sti's Avatar
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    update

    I called the Plano dealership again today and talked to the shop foreman. He said that there's variance of 2-7mph on each individual car that he's seen and that there's nothing they can do to correct that. I asked about calibration and electronic offset to which his reply was: Nope, we can't do anything like that. So I guess I'm stuck with a 5mph difference until I get new tires (and then we'll see where that leaves me).

    But anyway, regarding the Plano dealership. I was happy with their customer service. They answered right away which surprised me and it didn't take too long to transfer me to the shop. I was annoyed that they couldn't do anything but that's my only complaint.

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    lor
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    I just got an 05 STi. I was clocked going about 5mph slower than indicated on my speedo. I thought that the radar detector had something to do with it until I found this thread. I was wondering how many people are having the same problem. I guess if there is no way to correct it, then I can live with it. Don't have to worry about getting ticket. Everything is stock.

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    i just noticed that i am having a similar problem in my 02 bug eye, i was following some family and i look over and see that my 75 is his 65. i thought that it was his car but we checked it with another car and i was still 10 mph slower then what was reading. is there anything that can be done that anyone has discovered?

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    anyone?

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    Administrator Trainrex's Avatar
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    Quote Originally Posted by khmer04sti View Post



    I actually didn't notice it until I was clocked with a radar gun. Then I compared my speed to my brother's dsm and my fiancee's old beater. I was rather annoyed that a 1984 plymouth horizon had a better speedo than mine.
    An old DSM, and a 20+ year old Horizon aren't exactly the best ways to check your speedometer. Use a GPS.

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