Anwhere to get the Speedo Calabrated

[STi_Bandit]

Out of intrest i put a friends Spped Detector in the car and the GPS and the Speedo read out for MPH were about 5 - 8mph out, does anyone know where i might be able to get the speedo calibrated or if there is such a thing.

Martin

[irish al]

Dunnikier Way in Kirkcaldy beside ASDA []

Theres a wee box at the side of the road gives a

digital readout of how fast/slow your going.

Al

[scientific steve]

Dunnikier Way in Kirkcaldy beside ASDA []

Theres a wee box at the side of the road gives a

digital readout of how fast/slow your going.

Al

is that the kind that gives you a cash prize too   []

[STi_Bandit]

Points make Prizes or maybe a brucey bouns

[irish al]

No, it doesnt actually do anything if you are speeding.

It just constantly flashes your speed as you drive towards it,

kind of a deterant to speeding.

Its a good idea actually as Id rather have a sign tell me to slow

down than a copper, and it does seem to work.

Theres one down the sea front as well.

Al

[fai17]

i don't think there is such s thing for the cars.

[STi_Bandit]

So out of intrest then, when you put bigger alloys on the car, does that not affect the accuracy of the speedo reading

[scientific steve]

it would be interesting to find out how the police get their ones done

since they are ment to have the ones in the car done, or am i speaking out me rear

[st3ph3n]

You can get them recalibrated. Just don't know who does it. I just use my road angel as definitive source for accurate speed readings.

Cars generally over read as they are not allowed to under read.

I also have a link at home that tells you the percentage out your speedo will be when changing your wheels. Will post when I get home.

[STi_Bandit]

Cheers Stephen, Might look at investing in An orgin B2 there are only £279 now at halfords or £299 for the roadangel

Martin

[st3ph3n]

Costco had one of the Snoopers for £100+Vat recently. It looked like a really tidy bit of kit indeed. Much nicer than my classic road angel.

[p1ggm]

police have theres done down south somewhere, we had an old ex police t5 in and it had a cert on the speedo, cant remember the name thou...all i mind it was 3 letters

[oletam]

it would be interesting to find out how the police get their ones done

since they are ment to have the ones in the car done, or am i speaking out me rear

Police traffic cars generally come with a Smiths calibrated speedo fitted. They are checked by stop watches over a measured half mile(Certified by the roads authority) at 30, 40, 50 & 60 mph. The stop watches are also checked for accuracy over a 5 minute period using the speaking clock. Basically the car is driven at say an indicated 60mph and on passing the first marker post the passenger operates the stop watches(usually a pair) and measures to the second marker which should take 30 seconds.

The Roads Vehicle (Construction & Use) Regs state that the speedo must be accurate to within 10%(above or below), although I believe most speedos read slightly fast. I suppose that helps the manufacturers speed claims while flattering the driver a bit.[8-|]

[scientific steve]

it would be interesting to find out how the police get their ones done

since they are ment to have the ones in the car done, or am i speaking out me rear

Police traffic cars generally come with a Smiths calibrated speedo fitted. They are checked by stop watches over a measured half mile(Certified by the roads authority) at 30, 40, 50 & 60 mph. The stop watches are also checked for accuracy over a 5 minute period using the speaking clock. Basically the car is driven at say an indicated 60mph and on passing the first marker post the passenger operates the stop watches(usually a pair) and measures to the second marker which should take 30 seconds.

The Roads Vehicle (Construction & Use) Regs state that the speedo must be accurate to within 10%(above or below), although I believe most speedos read slightly fast. I suppose that helps the manufacturers speed claims while flattering the driver a bit.[8-|]

 

cheers for that

but i would of thought in this day and age of techcy stuff and gps and the likes it would be a bit more up to date than a chap with a stopwatch  []