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Thread: Kindly Share your bike's GPS speed

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    Smile Kindly Share your bike's GPS speed

    Hi everybody,
    For long time, i had the doubt that bikes 100cc and below usually show much higher than actual speed on the meter.
    So today i decided to check my Junoon's meter with my HTC GPS speedometer and i was ready to see about 10Km/h error at high speed but result was much more shocking.
    I took the bike to 90Km/h and my pillion friend holding my mobile reported that i am going at 76Km/h only i was shocked to hell, so i told him to hold on and then raved the ***** out of bike , was able to do 110Km/h (on a slight slopy road) but my friend reported again that i am actually going at only 90Km/h according to mobile GPS.

    Severely disappointed to know the inaccuracy of my bike's meter and also to know that usually when it is maxing out at 90Km/h, it is actually doing only 76Km/h.
    So
    Bike meter 90Km/h= 76Km/h actual speed
    Bike meter 110Km/h= 90Km/h acutal speed


    So if anyone of you has ever checked your bike's meter with GPS , kindly share it here so that everybody can get the idea of which bike is actually doing the real speed instead of just showing it on the meter.....
    Kindly do speed tests in controlled environment only (preferably on some empty road outside the populated areas), and please must wear the helmet at least before you unleash your rides.

    PS: I have matched my mobile's GPS speedometer with Car's meter and it shows exactly same speed as on the car's meter so no doubt about its acccuracy. By the way my bike has Alson's speedometer which i think is considered more accurate.
    Below is the screenshot from mobile showing maximum achieved speed aka 90Km/h. App name is "Ulysse Speedometer"
    Tip to take screenshot in Android: Press and hold down power button, and then press the home button, screenshot will be saved to your camera shots folder.


    Disclaimer: Speed thrills but kills. Please do not abide speed limit

    Pakwheels is not responsible for any loss/damage to any one.
    Pakwheels strictly suggests all the drivers/bikers to drive/ride within speed limit and avoid over speeding.

    Attached Images Attached Images  

  2. #141
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    Quote Originally Posted by irfan834u View Post
    Hello All,

    FYI, all of you are using cell phone's GPS to measure speed which is built only for commercial use (accuracy is around 100~200 meters which is a big tolerance).... if you want these result to be real you have to use GARMIN GPS which normally pilots use then you will get same speed which you bike's meter is showing.

    bikes meter is more accurate because its a mechanical speedometer, it is not connected to any third party satellite or so...

    there is another option to check accuracy of your bikes meter, ask some of your friend to catch you on some CAR like GLI, CITY etc and then compare your bike's speed with the car speedometer, i am sure they will be exactly same.. i have mapped the speed o meter of yamaha junoon and CD70 and TOYOTA GLI all are giving same speed.
    i got 10 meters accuracy consistantly ..
    may be i also got sometimes 8 meters ..

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    Quote Originally Posted by asjdsm View Post
    i got 10 meters accuracy consistantly ..
    may be i also got sometimes 8 meters ..
    screenshot in my first post is showing 5 meter accuracy, i know when you are stationary, it can't give you pinpoint accuracy of your location. But once you are on the move, it's calculation of speed is almost perfectly accurate, tested many times in car. If you still have doubt, you can go to android market and read reviews on this app.

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    Quote Originally Posted by gull_s_777 View Post
    screenshot in my first post is showing 5 meter accuracy, i know when you are stationary, it can't give you pinpoint accuracy of your location. But once you are on the move, it's calculation of speed is almost perfectly accurate, tested many times in car. If you still have doubt, you can go to android market and read reviews on this app.
    I have a question gull bhai, why are you saying that your speed measured by GPS is more accurate than speedometer of your bike...

    also please tell me which oil you use in your bike i use caltex havoline 20w50 i think, and after how much km you change oil..

    also tell your tuning intervals means after how many km you take ur bike for tinning..

    regards

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    ^^^^
    I am saying so because when i am at 110Km/h on my bike meter, a CG125 clocking 100Km/h passes me easily. So there must be something fishy right?? so i checked via GPS, and my bike's 110Km/h is 90Km/h on GPS, while CG125's 100Km/h is 93Km/h on GPS.
    So that clears it all.

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    OK thanks for clarification,

    i have downloaded that application on my nexus s and i will check this in evening and share results with you.
    but i have checked my junoon's meter with corolla and it was giving same reading.. but my junoon never crossed 93km/h but your junoon is giving 100+ that means there could be some problem in your meter or your engine setting is perfact.

    i am also working on doing some geeks in the engine to achieve more speed on junoon, as my spark plug reading is not good at all after first tune up.. i am very angry on that mechanic..

    please also answer my other questions on you junoon's thread...

  7. #146
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    Quote Originally Posted by irfan834u View Post
    but i have checked my junoon's meter with corolla and it was giving same reading.. but my junoon never crossed 93km/h but your junoon is giving 100+ that means there could be some problem in your meter or your engine setting is perfact.
    hmmm, my bike crossing 100 is all due to meter error. And your bike never crossing 93 most probably indicate your meter error is gonna be much less than mine. anyway , try the app and result will tell how fast are you going actually.

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    Quote Originally Posted by gull_s_777 View Post
    hmmm, my bike crossing 100 is all due to meter error. And your bike never crossing 93 most probably indicate your meter error is gonna be much less than mine. anyway , try the app and result will tell how fast are you going actually.
    but let me tell you one thing i will never believe on GPS of mobile phones it will always give you 5-10 km less speed then your actual speed, i have tried it using nokia5800 on toyota corolla and samsung wave525 on honda civic both of them gave 10km less reading but one of my friend have GAMIN GPS he is a pilot and that GPS give accurate speed in honda civic,

    now i will also check my nexus s gps with junoon and i am sure it will give 10km less, but i will tell exact result in night.

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    ^^^ ok bro, now can't force you to believe
    looking forward to your results...

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    Quote Originally Posted by vickytulla View Post
    Hey Silver_Knife why dont you give a hit to your paiggo, I really want to know what it actually does, I could have done it on my bike but its old and as I have abused so much I know it cant, it has only8~9 PSI pressure left in rings.

    beside I have read alot in your post that it hits 120 easy wesi while traveling to karachi so lets see if it really does because mine never did... may be because I have been a bad rider lollzzzz
    Will do that soon InshAllah

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    This app is a serious one... previously all other apps had pathetic accuracy, but this one is really good.

    + I have read on the net that our hand held phones are capable of an avg 20M accuracy...

    Some older phones and older apps would show much poor results.

    I myself have fair faith in the results from this app as compare to cheap speedometers... my old Cd70 used to show 115kmph and I was extremely excited about it , some time ago... now that speedo is dead

    So u can't exactly believe on cheap bikes and their speedos...
    Speed guns and GPS is the more accurate way..

    Sent from my Nexus S using Tapatalk 2

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    here comes the results uptill 50km/h speedo meter and GPS gave same speed but on high speed error started to induced, my junoon hit max speed of 90km/h and GPS shows 83km/h max. i will say it is the error of GPS reading on high speeds but you people can say that its speedo meter error... i will also borrow GARMIN GPS from my friend and than again do this speed comparison and will surely share with you people...
    Kindly Share your bikes GPS speed -1083523

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    Quote Originally Posted by irfan834u View Post
    my junoon hit max speed of 90km/h and GPS shows 83km/h max.
    most of the time , my junoon also tops at this speed only (83km/h GPS).... but my meter error is more than everybody here and it shows 100Km/h on meter for that speed. So in my opinion, you have got much more accurate meter than most of us.

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    Quote Originally Posted by gull_s_777 View Post
    most of the time , my junoon also tops at this speed only (83km/h GPS).... but my meter error is more than everybody here and it shows 100Km/h on meter for that speed. So in my opinion, you have got much more accurate meter than most of us.
    My speedo is more accurate than urs but my fuel gauge is v.inaccurate... though I know how to read it correctly, I know its error margin and I correct it

    Sent from my Nexus S using Tapatalk 2

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    Quote Originally Posted by Automotorsport_Lover View Post
    My speedo is more accurate than urs
    offcourse it is, my speedometer error is just crazy...

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    As per my experience, the speedometer of your bike is relatively more reliable than the GPS of your cell phone.
    The GPS readings could be inaccurate upto 10ft. or at times even more than that, which means that the speed calculations are not accurate... so you don't have anything to worry about.

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  24. #156
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    As I have said i don't trust on these apps
    because they do give wrong & inaccurate readings
    Today in Gli Corolla this app was showing inaccurate speed consistently
    & also have tested this on Suzuki Cultus it was giving error of 4 to 7kmph
    while Gli was meter was on 100kmph GPS was showing 92 & than on second time it showed 95kmph
    When Gli meter was 120kmph this app was showing 112/115kmph


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    Quote Originally Posted by amjad635 View Post
    As I have said i don't trust on these apps
    because they do give wrong & inaccurate readings
    Today in Gli Corolla this app was showing inaccurate speed consistently
    & also have tested this on Suzuki Cultus it was giving error of 4 to 7kmph
    while Gli was meter was on 100kmph GPS was showing 92 & than on second time it showed 95kmph
    When Gli meter was 120kmph this app was showing 112/115kmph

    completely agreed, there is always error of ~10km/h i have also checked it many times...

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    Quote Originally Posted by dadvoc View Post
    As per my experience, the speedometer of your bike is relatively more reliable than the GPS of your cell phone.
    The GPS readings could be inaccurate upto 10ft. or at times even more than that, which means that the speed calculations are not accurate... so you don't have anything to worry about.

    exactly...

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    GPS devices are positional speedometers, based on how far the receiver has moved since the last measurement. Its speed calculations are not subject to the same sources of error as the vehicle's speedometer (wheel size, transmission/drive ratios). GPS speed calculations generally are more accurate than a vehicle’s speedometer since it is not affected by the same inaccuracies, including the vehicle’s wheel size or drive ratios .GPS calculations are dependent, however, on satellite signal quality — although with the use of moving average calculations, any errors are considered minimal.\Vehicle speedometers also require calibration to maintain accuracy because general wear and tear, changing wheel sizes, and the manufacturer’s ‘erring on the side of caution’ .Sources of error due to tire diameter variations are wear, temperature, pressure, vehicle load, and nominal tire size. Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle and setting the speedometer to read higher than the actual speed — all contribute to inaccuracies. including the ratios of the gears in the drive cable, the final drive ratio in the differential and the diameter of the tires. ..

    P.S.

    also read about speedometers error on wikipedia ...
    Rise from the ashes,.....

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    i love this threead .....
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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