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My Speedo Is Lying !!!

This is a discussion on My Speedo Is Lying !!! within the General Help forums, part of the LSx Technical Help Section category; sooo, yesterday i went on the autobahn with my gps navigation on and guess what: my speedo shows between 1.5 ...

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    This Light Dinner Is Over hamburger68's Avatar
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    My Speedo Is Lying !!!

    sooo, yesterday i went on the autobahn with my gps navigation on and guess what: my speedo shows between 1.5 and 2.5 miles less than the gps system... shouldn't the speedo lie in favor of you? speedo 160 kmph, gps 164 kmph.
    btw: stock tires and gear ratio.

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    Sarge for AAG Emperor hutch1999's Avatar
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    usually the speedo is off a little bit at high speeds but you were only running 102mph. Id say it was just off a little bit from the factory I wouldnt worry to much 1.6mph

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    Sarge for AAG Emperor hutch1999's Avatar
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    Quote Originally Posted by hamburger68 View Post
    sooo, yesterday i went on the autobahn with my gps navigation on and guess what: my speedo shows between 1.5 and 2.5 miles less than the gps system... shouldn't the speedo lie in favor of you? speedo 160 kmph, gps 164 kmph.
    btw: stock tires and gear ratio.
    you do mean kilometers per hour, correct?

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    This Light Dinner Is Over hamburger68's Avatar
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    Quote Originally Posted by hutch1999 View Post
    you do mean kilometers per hour, correct?
    correct, it was off between 2 and 5 kilometers at speeds between 130 and 180 km/h. usually those gps systems are really accurate.
    and no, i'm not worried, just found it interesting. here, car manufacturers are bound by law to have their speedos never show less than the actual speed, so they usually add up to 7 or 8%.

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    Sarge for AAG Emperor hutch1999's Avatar
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    Quote Originally Posted by hamburger68 View Post
    correct, it was off between 2 and 5 kilometers at speeds between 130 and 180 km/h. usually those gps systems are really accurate.
    and no, i'm not worried, just found it interesting. here, car manufacturers are bound by law to have their speedos never show less than the actual speed, so they usually add up to 7 or 8%.
    wow stiff law lol. so have you top the car out yet?

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    This Light Dinner Is Over hamburger68's Avatar
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    Quote Originally Posted by hutch1999 View Post
    wow stiff law lol. so have you top the car out yet?
    naa, but this spring when it gets warmer... 155 mph is my max by now, there should be a little headroom. but 110 mph on cruise control is nice too...

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    Sarge for AAG Emperor hutch1999's Avatar
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    Quote Originally Posted by hamburger68 View Post
    naa, but this spring when it gets warmer... 155 mph is my max by now, there should be a little headroom. but 110 mph on cruise control is nice too...
    oh yeah lol it cuts trips in half lol

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    Mr. YUK BigBrian442's Avatar
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    While scanning my car with HPtuners I find the Speedo shows a few MPH off from what the PCM is showing.

    Brian

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    Rice Killa JwMonE99's Avatar
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    Must be nice to live on near autobahgn lol

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    I think the the U.S. manufactures can be off as high as almost 5%. The pigs on the other hand have to have there speedos calibrated with in 2%.

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    This Light Dinner Is Over hamburger68's Avatar
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    Quote Originally Posted by tylerdurden1 View Post
    I think the the U.S. manufactures can be off as high as almost 5%. The pigs on the other hand have to have there speedos calibrated with in 2%.
    pigs = cops?

    and by off you mean in both directions?

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    🤔 11s. blackbirdbrain89's Avatar
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    u guys know whats bad i live in the u.s and i have had my car as fast as u.... 155 mph thats only 5th gear thats not even the top of 5th.. i have a ? what is the top speed in 5th gear?

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    Quote Originally Posted by blackbirdbrain89 View Post
    u guys know whats bad i live in the u.s and i have had my car as fast as u.... 155 mph thats only 5th gear thats not even the top of 5th.. i have a ? what is the top speed in 5th gear?
    believe its low 180s ....im sure somone has a link to the fbody gear calulator though....its around 190 in my car wheni looked it up...stock 3.42s but my redline is raised to 6800 so at 6100...180ish
    Last edited by tonyjnjz; 01-04-2008 at 10:08 AM.

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    This Light Dinner Is Over hamburger68's Avatar
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    Quote Originally Posted by tonyjnjz View Post
    believe its low 180s ....im sure somone has a link to the fbody gear calulator though
    150 or little over is the top of 3rd gear in my auto, so...

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