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What is correct, Speedo or sat nav?
Comments
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OK fair enough, I misunderstood the point -- I thought you meant that lack of visibility was a factor. Sorry
Still, if the car is unbalanced enough that braking would cause unpredictable results, it might be an idea to slow down a little.0 -
Still, if the car is unbalanced enough that braking would cause unpredictable results, it might be an idea to slow down a little.
It's braking that causes the imbalance, which is really the point I was making. A corner can be perfectly safe at speed until you do something stupid like slamming on the brakes.
You brake, the centre of gravity shifts to the front wheels, the rear end becomes lighter (less grip), the front end becomes heavier (more grip) this is not normally a problem unless you happen to be cornering at the time.
The taller the car the worse it is, then factor in soft suspension and this effect is multiplied..... The results can be catastrophic
Ya'll can take my word for it
, or give it a go for yourselves.... “I may not agree with you, but I will defend to the death your right to make an a** of yourself.”
<><><><><><><><><<><><><><><><><><><><><><> Don't forget to like and subscribe \/ \/ \/0 -
C_Mababejive wrote: »Indeed though the prescribed and supplied apparatus for such measurement is the vehicle speedometer and so it is to that which we should give greater credence and it suffers much less hysteresis than a sat nav
You what?
After googling the meaning of hysteresis , I still have no idea what you mean
If a speedo is wrong and is proven to be by a satnav in the vehicle then the speedo is irelevant0 -
It's simple, just drive to the conditions where the satnav is accurate (flat, straight, clear sky etc.) and is indicating exactly 70. Note what position your speedo is at. Suppose that turns out to be 77mph, as it is currently on my Mondeo.
You now know you can drive at an indicated 77mph without breaking the 70mph speed limit. Combine with cruise control for the best results.
I wouldn't recommending trying to extrapolate that figure upwards or downwards. Do it separately for each speed you're interested in.0 -
Having recently attended a Speed Awareness course and grumbling about the fact I was "only doing 34" I was politely informed that a speedo is set around 3-4 mph slower than the true speed.
A sat nav, I would assume, is using an "average" because it is having to get its reading via a satellite and there has to be some delay surely??
Very good question and I am sure there are more knowledgeable peeps out there who will blow my theory out of the water!! LOL
Then you were misinformed.The greater danger, for most of us, lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark0 -
Having recently attended a Speed Awareness course and grumbling about the fact I was "only doing 34" I was politely informed that a speedo is set around 3-4 mph slower than the true speed.They were lying to you -- it's 3-4mph faster!
Manufacturers do not deliberately set the speedometer incorrectly.The greater danger, for most of us, lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark0 -
Manufacturers do not deliberately set the speedometer incorrectly.
A car which underreads is not legal. The majority of speedometers do indeed overread, typically by 5-10%.
The cost of making a speedo that reads 100% correctly would be prohibitively expensive. Since an underreading speedo is illegal, what makes you think that manufacturers don't err on the side of caution?0 -
Strider590 wrote: »
Ya'll can take my word for it , or give it a go for yourselves....
No thanks, I will continue to drive at a safe speed around bends.;)0 -
Manufacturers do not deliberately set the speedometer incorrectly.
But they do have to work to cost which means the speedo will never be as accurate as the satnav. To protect themselves from the claims culture they ensure the accuracy is always to the plus side to ensure they cannot be held liable if you get a ticket for 32 when your speedp readout is 30.;)I like the thanks button, but ,please, an I agree button.
Will the grammar and spelling police respect I do make grammatical errors, and have carp spelling, no need to remind me.;)
Always expect the unexpected:eek:and then you won't be dissapointed0 -
I guess the german manufactures can be bothered to calibrate their speedos properly.
That's because some of them with in-built sat navs can't be bothered to modify their kit to allow a 6 digit UK post code.I used to think that good grammar is important, but now I know that good wine is importanter.0
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