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> speed km/h on car and motorcycle, why not tally..should be the same rite?

li_hat
post Jun 5 2012, 12:03 PM


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hello /k/

want to know why speedometer on motorcycle and car not the same, i mean some people say 100km/h on motor is not the same with 100km/h on car..

it should be the same for both speed either on motor and car as we calculate speed..need your opinion..thanks
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MyKy44
post Jun 5 2012, 12:05 PM


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shud be same wat.

u try la go side by side wit your kawan on a motor, u in car. then check each other's speedometer (ask him ride at driver side)

and then crash into each other bing bong biang kena divider
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zeese
post Jun 5 2012, 12:06 PM


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speedometer on cars also not accurate...
if you want accuracy, use gps..
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queenc
post Jun 5 2012, 12:07 PM


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civic accurate?
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alvin ong
post Jun 5 2012, 12:08 PM


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use a gps.
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mabaw
post Jun 5 2012, 12:08 PM


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actually its very hard for the speedometer to be accurate be it in a car or bike
thats why when accurate reading of vehicle is needed, people use gps
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WaCKy-Angel
post Jun 5 2012, 12:09 PM


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why not same??

If u drop 1KG metal vs 1KG wool (benang) from 100th floor building, which one reach the floor 1st?


The reason not same is coz the meter are actually cycle count/turn from your car tyre..
It can be tuned so slight tuning may cause different accuracy.
Especially if ur rim is 14" and u change to 15" surely it will different alot if they didnt tune it.
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li_hat
post Jun 5 2012, 12:09 PM


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some say 140km/h on motor only equivalent to 100km/h on car

some say 200km/h on merc car are not the same with 200km/h poton car
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deodorant
post Jun 5 2012, 12:10 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:09 PM)
If u drop 1KG metal vs 1KG wool (benang) from 100th floor building, which one reach the floor 1st?

metal reaches the floor first because it has a far greater terminal velocity icon_idea.gif
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MyKy44
post Jun 5 2012, 12:11 PM


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seems like i very dum fak.. tenkiu this tered for enlightening my brain notworthy.gif
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RitchieV
post Jun 5 2012, 12:11 PM


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Errr i think its different cause weight difference......

Not really sure also..... icon_rolleyes.gif
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TearsRainzz
post Jun 5 2012, 12:14 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:09 PM)
why not same??

If u drop 1KG metal vs 1KG wool (benang) from 100th floor building, which one reach the floor 1st?
The reason not same is coz the meter are actually cycle count/turn from your car tyre..
It can be tuned so slight tuning may cause different accuracy.
Especially if ur rim is 14" and u change to 15" surely it will different alot if they didnt tune it.
*
actually is metal reach first, because 1 kg wool is bigger in size, so it will face more air resistance.
If the experiment is regardless of the air resistance (means in a vacuum space), then both will reach floor at the same time.

Just my thought, correct me if i were wrong
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WaCKy-Angel
post Jun 5 2012, 12:14 PM


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QUOTE(deodorant @ Jun 5 2012, 12:10 PM)
metal reaches the floor first because it has a far greater terminal velocity icon_idea.gif
*
U should try it sometimes

QUOTE(RitchieV @ Jun 5 2012, 12:11 PM)
Errr i think its different cause weight difference......

Not really sure also..... icon_rolleyes.gif
*
So lori moving at 80kph is slower than motor moving at 80kph?
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WaCKy-Angel
post Jun 5 2012, 12:17 PM


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QUOTE(TearsRainzz @ Jun 5 2012, 12:14 PM)
actually is metal reach first, because 1 kg wool is bigger in size, so it will face more air resistance.
If the experiment is regardless of the air resistance (means in a vacuum space), then both will reach floor at the same time.

Just my thought, correct me if i were wrong
*
Does the egg comes 1st or the chicken?

Hahaha theoretically u are correct, but metal also comes in many forms... Mercury also is considered "metal" so size does not matter in this experiment
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li_hat
post Jun 5 2012, 12:17 PM


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i tumpang my pakcik bmw, saw he drove over 120km/h

then he said proton car should be 140-150kmh with the same speed with his bmw

then i said no lah, should be the same wat..

he counter back said different cc different speedometer speed, i like what the fuk..
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spikeman
post Jun 5 2012, 12:17 PM


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QUOTE(li_hat @ Jun 5 2012, 12:09 PM)
some say 140km/h on motor only equivalent to 100km/h on car

some say 200km/h on merc car are not the same with 200km/h poton car
*
user posted image
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SonnyCooL
post Jun 5 2012, 12:18 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:09 PM)
why not same??

If u drop 1KG metal vs 1KG wool (benang) from 100th floor building, which one reach the floor 1st?
The reason not same is coz the meter are actually cycle count/turn from your car tyre..
It can be tuned so slight tuning may cause different accuracy.
Especially if ur rim is 14" and u change to 15" surely it will different alot if they didnt tune it.
*
what u said is totally not related ......
this thread is abt meter ? KM/H not how speed to be calculate ...

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WaCKy-Angel
post Jun 5 2012, 12:19 PM


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QUOTE(li_hat @ Jun 5 2012, 12:17 PM)
i tumpang my pakcik bmw, saw he drove over 120km/h

then he said proton car should be 140-150kmh with the same speed with his bmw

then i said no lah, should be the same wat..

he counter back said different cc different speedometer speed, i like what the fuk..
*
He got a point... bmw at 120kmh the needle should be pointing around "10-12o'clock" position, so for a protong car it should be atleast pointing at position between "2-4o'clock"
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deodorant
post Jun 5 2012, 12:20 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:14 PM)
U should try it sometimes

QUOTE(WaCKy-Angel @ Jun 5 2012, 12:17 PM)
but metal also comes in many forms... Mercury also is considered "metal" so size does not matter in this experiment

i'm not going to bother arguing physics with someone who very obviously doesn't know what he's talking about
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MISMan
post Jun 5 2012, 12:20 PM


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there's a thing called CALIBRATION, apart of tolerance %.

Meter Manufacturer claims to include ~5% tolerance on accuracy. TAMBAH with car manufacturer's claim to include another 5% tolerance level, total around 10%.

use a gps for precise reading!

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SonnyCooL
post Jun 5 2012, 12:21 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:19 PM)
He got a point... bmw at 120kmh the needle should be pointing around "10-12o'clock" position, so for a protong car it should be atleast pointing at position between "2-4o'clock"
*
then my bike is reverse how ? my meter go from right to left .... so when i in 0 km/h all car must be on 200 ++ lo ....

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SonnyCooL
post Jun 5 2012, 12:21 PM


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QUOTE(deodorant @ Jun 5 2012, 12:20 PM)
i'm not going to bother arguing physics with someone who very obviously doesn't know what he's talking about
*
yah that is so true ....
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Coldf3ar
post Jun 5 2012, 12:21 PM


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Then how those police traffic trace us? Can select what car what car eh?
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SonnyCooL
post Jun 5 2012, 12:22 PM


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QUOTE(MISMan @ Jun 5 2012, 12:20 PM)
there's a thing called CALIBRATION, apart of tolerance %.

Meter Manufacturer claims to include ~5% tolerance on accuracy. TAMBAH with car manufacturer's claim to include another 5% tolerance level, total around 10%.

use a gps for precise reading!
*
this is so far best answer .....
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dma0991
post Jun 5 2012, 12:25 PM


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QUOTE(li_hat @ Jun 5 2012, 12:03 PM)
hello /k/

want to know why speedometer on motorcycle and car not the same, i mean some people say 100km/h on motor is not the same with 100km/h on car..

it should be the same for both speed either on motor and car as we calculate speed..need your opinion..thanks
*
If you're comparing big CC bikes 250CC and above like the Kawasaki Ninja 250R, it is the same as the car. If you're comparing against kapcai with a normal car, then there is a difference. My mechanic told me last time that those kapcai, including 135LC got "meter ringan", made it to feel as though you're faster on the speedometer but in actual fact you're not going as fast it says it does. That is why people think that the Kawasaki Ninja 250R is slow compared to a normal kapcai because of the rated top speed but on the road or a race, almost any kapcai will lose.

For a superbike vs a car in terms of speed you read on the meter, it is the same except that motorcycle has way faster acceleration but slightly lower top speed.
» Click to show Spoiler - click again to hide... «

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WaCKy-Angel
post Jun 5 2012, 12:26 PM


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QUOTE(deodorant @ Jun 5 2012, 12:20 PM)
i'm not going to bother arguing physics with someone who very obviously doesn't know what he's talking about
*
LOL whatever dude.. Your point is 1KG metal should be "relatively small" compared to 1KB of wool.
My point is there are many types of metals that has different weight, you just have to find one that has the same size/width or whatever fk u think can affect the physics of yours.
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li_hat
post Jun 5 2012, 12:26 PM


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another situations,

i ride my friend lc then i told him i manage to get 140km/h

then other friend of mine said that speed is the same with 100km/h on car..

hmm..
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jonn zee
post Jun 5 2012, 12:26 PM


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In many countries the legislated error in speedometer readings is ultimately governed by the United Nations Economic Commission for Europe (UNECE) Regulation 39[3] which covers those aspects of vehicle type approval which relate to speedometers. The main purpose of the UNECE regulations is to facilitate trade in motor vehicles by agreeing uniform type approval standards rather than requiring a vehicle model to undergo different approval processes in each country in which it is to be sold.

European Union member states must also grant type approval to vehicles meeting similar EU standards. The ones covering speedometers [4] [5][6] are similar to the UNECE regulation in that they specify that:

The indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading.
The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. For example, at 80 km/h, the indicated speed must be no more than 92 km/h.


sos speedometer
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mi-g
post Jun 5 2012, 12:31 PM


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i test edy using GPS.. motor (EX5) gps show 100km/j, meter show 120km/j

potong saga - gps show 120km/j, meter show 130km/j

its all about tolerance
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deodorant
post Jun 5 2012, 12:34 PM


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QUOTE(WaCKy-Angel @ Jun 5 2012, 12:26 PM)
LOL whatever dude.. Your point is 1KG metal should be "relatively small" compared to 1KB of wool.
My point is there are many types of metals that has different weight, you just have to find one that has the same size/width or whatever fk u think can affect the physics of yours.

don't try to cover line lar. you were trying to make a point saying 1kg of metal falls the same speed of 1kg of wool, that is only accurate in a vacuum. in the atmosphere, assuming both materials are formed in the same shape, the vast majority of metals have a higher specific density than wool, and therefore will fall quicker.
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MISMan
post Jun 5 2012, 12:35 PM


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QUOTE(dma0991 @ Jun 5 2012, 12:25 PM)
If you're comparing big CC bikes 250CC and above like the Kawasaki Ninja 250R, it is the same as the car. If you're comparing against kapcai with a normal car, then there is a difference. My mechanic told me last time that those kapcai, including 135LC got "meter ringan", made it to feel as though you're faster on the speedometer but in actual fact you're not going as fast it says it does. That is why people think that the Kawasaki Ninja 250R is slow compared to a normal kapcai because of the rated top speed but on the road or a race, almost any kapcai will lose.

For a superbike vs a car in terms of speed you read on the meter, it is the same except that motorcycle has way faster acceleration but slightly lower top speed.
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*
all motorbikes have meter tolerance of ~5 to ~10% higher tolerance (5 to 10% higher than actual speed) reading.

ALL meters developed to be the same except that (lack of) calibration and tolerance. Otherwise, U WON't NEED A STANDARD METER anymore.

Most SBK have higher top speed than a car, depending of type (chopper, cruiser, supersports, ect)

Just 2 cents from owning a lc135, 250r, zx-10r n dugong.



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suicideroach
post Jun 5 2012, 12:38 PM


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GPS also not 100% accurate la.... have u all heard about satellite lag?
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WaCKy-Angel
post Jun 5 2012, 12:38 PM


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QUOTE(deodorant @ Jun 5 2012, 12:34 PM)
don't try to cover line lar. you were trying to make a point saying 1kg of metal falls the same speed of 1kg of wool, that is only accurate in a vacuum. in the atmosphere, assuming both materials are formed in the same shape, the vast majority of metals have a higher specific density than wool, and therefore will fall quicker.
*
U win teh internut bro thumbup.gif thumbup.gif

Cover or not, its legal. I mentioned 1KG but never mentioned about width or whatsoever..
I also never mentioned about this physics or even gravity that u mentioned but u added it in..
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dma0991
post Jun 5 2012, 12:42 PM


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QUOTE(MISMan @ Jun 5 2012, 12:35 PM)
all motorbikes have meter tolerance of ~5 to ~10% higher tolerance (5 to 10% higher than actual speed) reading.

ALL meters developed to be the same except that (lack of) calibration and tolerance. Otherwise, U WON't NEED A STANDARD METER anymore.

Most SBK have higher top speed than a car, depending of type (chopper, cruiser, supersports, ect)

Just 2 cents from owning a lc135, 250r, zx-10r n dugong.
*
Of course tolerance would be included as well but would you consider calibrating those meters very precisely for a product that isn't that expensive compared to a superbike? The need for accuracy isn't there and leaving the tolerance loose by 40km/h just adds to their shiok factor. My mechanic has raced in the cubprix before and from what I can see from his 125Z race bikes, he used a digital meter instead, where accuracy in speed actually matters.
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MISMan
post Jun 5 2012, 12:48 PM


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QUOTE(dma0991 @ Jun 5 2012, 12:42 PM)
Of course tolerance would be included as well but would you consider calibrating those meters very precisely for a product that isn't that expensive compared to a superbike? The need for accuracy isn't there and leaving the tolerance loose by 40km/h just adds to their shiok factor. My mechanic has raced in the cubprix before and from what I can see from his 125Z race bikes, he used a digital meter instead, where accuracy in speed actually matters.
*
as i said earlier, meter is 1 factor, other mechanical part is another, wacky angel already pointed out that wheel size makes it another factor.

No matter how accurate (or what type) is the meter, other factors will affect the reading. Therefore, meter manufacturer said 1 thing, car/bike manufacturer add another thing (as a collective result).

To make things easier, they always make the tolerance level higher than actual. Some says, it's to help to reduce speeding. Others say, Higher than actual reading - u won't die; Slower than actual reading, u can crash like nobody's business!


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aaaeye
post Jun 5 2012, 01:06 PM


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I just wonder why people will use GPS to get the accurate reading.. coz if use GPS, means use satellite..take more time since the GPS need to send and receive signal.. unsure.gif
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Narako
post Jun 5 2012, 01:11 PM


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then what are the ways to get a proper speed?

police camera?
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dont8cum
post Jun 5 2012, 01:20 PM


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erm try to maintain on a constant speed den move for 1km and record the time with stopwatch den use calculator calculate la.
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SonnyCooL
post Jun 5 2012, 01:22 PM


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QUOTE(aaaeye @ Jun 5 2012, 01:06 PM)
I just wonder why people will use GPS to get the accurate reading.. coz if use GPS, means use satellite..take more time since the GPS need to send and receive signal..  unsure.gif
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u know how fast between ur gps device and satellite transmit signal ???

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izutaisa
post Jun 5 2012, 01:24 PM


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my kriss can go 160kmh and my untied helmet didnt blow off yo.if my superbike 100 oso helmet gone
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li_hat
post Jun 5 2012, 01:40 PM


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i guess the conclusion is about meter calibration
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BarnabasCollins
post Jun 5 2012, 01:47 PM


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QUOTE(suicideroach @ Jun 5 2012, 12:38 PM)
GPS also not 100% accurate la.... have u all heard about satellite lag?
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who said GPS is 100% accurate? ur the only 1 mention it here....

Well at least we share the same satellite so we can get the same speed reading rather than different car with different speedometer right....
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nelienuxe_sara
post Jun 5 2012, 01:50 PM


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spedo ade ralat bai
mcm aku bawak 260km/h kalau cek dgn gps 250 je sebenarnye
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