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18th March 2018, 05:43 PM
#1
Simple and probably stupid question about percentage on speedo
If car speedo reads 50kmh and GPS reads 58kmh
https://percentagecalculator.net/
do I type in from that calculator as the following
What is the percentage increase/decrease
from
50 to 58? Or is it the other way around?
from 50 to 58 returns 16%
Reason asking because the Tripometer shows 12.5km distance travelled while GPS distance travelled which is 14.91km travelled.
Which is 19.28% difference.
Trying to get what is right and wrong so eventually I can work out my fuel consumption lol
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18th March 2018 05:43 PM
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18th March 2018, 06:06 PM
#2
I am he, fear me
Technically, you should always work out % of an error against an actual parameter.
IE actual = 100% and error (or difference) is a percentage of actual
Your Speedo at 58 KPH actual speed is under reading by 8 KPH or 14%
Your Odo at 14.91 actual travelled is under reading by 2.4 K's or 16%
This would mean if you adjust the speedo drive cog in the gearbox so the Odo was accurate the speedo would overread which, indeed, it should as required by ADR.
Last edited by the evil twin; 18th March 2018 at 06:11 PM.
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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18th March 2018, 06:14 PM
#3
Ill definately get a cog to fix things up but at this point.
Which percentage am I going by then to work out fuel consumption? The 14 percent or 16 percent difference?
Thanks Mate
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18th March 2018, 06:32 PM
#4
I am he, fear me
Oops my bad...
Sorry to be confusing but I didn't know that is what you wanted to work out.
When you are working out an actual unknown from an erroneous known parameter the figure is as you posted.
Sooo... when the Odo reads 12.5 (known but wrong) and you want to know actual it will be 12.5 X 1.19
IE for every 1 Klm shown as travelled you will have gone 19% ish further than that.
For that calc link
using 14.9 as value 1 and 12.5 as value 2 returns 16% or the amount of error in %
using 12.5 as value 1 and 14.9 as value 2 returns 19% or the amount of compensation needed in %
You need to apply the 2nd number IE 19%
Last edited by the evil twin; 18th March 2018 at 06:43 PM.
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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18th March 2018, 06:40 PM
#5
Originally Posted by
the evil twin
Oops my bad...
Sorry to be confusing but I didn't know that is what you wanted to work out.
When you are working out an actual unknown from an erroneous known parameter the figure is as you posted.
Sooo... when the Odo reads 12.5 (known but wrong) and you want to know actual it will be 12.5 X 1.19
IE for every 1 Klm shown as travelled you will have gone 19% ish further than that
lol. Thankyou . Its my fault. I probably dont articulate well.
So basically add on 19 percent on top or whatever is showing on the Tripometer everytime I fill up?
Say I done 460kms
so 1.19 x 460kms = real distance travelled?
To correct I seen people buy those cogs. They work out how many teeth their car has and they swap over
New Gear.JPG
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18th March 2018, 06:43 PM
#6
Legendary
If it means that much and it's a GQ there is a fix for your speedo on here somewhere just search for it , mines 10 kilometres out when tyres are new when worn a bit about 6 kilometres an hour but as long as actual speed is at the speed limit it means nothing really .
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18th March 2018, 06:46 PM
#7
I am he, fear me
Originally Posted by
drgtr
So basically add on 19 percent on top or whatever is showing on the Tripometer everytime I fill up?
Say I done 460kms
so 1.19 x 460kms = real distance travelled?
Yep... I'd use 20% just to make it easy
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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18th March 2018, 06:47 PM
#8
Originally Posted by
the evil twin
Yep... I'd use 20% just to make it easy
Legend. Cheers Mate. Appreciate your help always
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18th March 2018, 06:48 PM
#9
Originally Posted by
GQtdauto
If it means that much and it's a GQ there is a fix for your speedo on here somewhere just search for it , mines 10 kilometres out when tyres are new when worn a bit about 6 kilometres an hour but as long as actual speed is at the speed limit it means nothing really .
Its a GU.
lol Honestly just want to work out fuel consumption. Thats it.
Im happy driving my 42tdi.
I love it.
When I drove the prado. It felt like a soccers mums car.
This patrol I feel like a man! haha
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