Anyone Calibrated Their Speedo?

[sotal]

Just tested my Cars Speedo with a GPS speed Program, which is supposed to be 98.something% accurate. These were my results:

Car Speedo |

Reading | GPS Reading

30 | 29.9

40 | 39.8

50 | 49.7

60 | 59.7

Other users of the software report that the software shows the car to be going about 5mph slower than the speedo says (so their speedo over-reads). I always assumed that mine would over-read by about 5mph but it appears it's actually fairly accurate.

Is it just my car or are Toyotas made fairly accurate?

The other cars tested were a Daewoo Matiz and an Audi A4 which both over-read by about 5mph

[stevetubbyturbo]

I did a similar thing with my GPS speed system and was surprised how close the speedos are on both my Toyotas only about average of 3% differance over all

Steve

[sotal]

Humm, Interesting.

It seems when you are going at 100mph in a Toyota you really are going at 100mph!!! or atleast very close to!

Wheras somebody in an Audi or a BMW who says they were going at 100mph is probably only doing about 90mph!

Very Interesting! My mum always said my car felt a lot faster at each speed than her BMW 328 did at the same time!! Now I know why - it's going faster!

[Crisis]

Hehe, you do that yourself or are these readings and actual readings on a website?

[CraigR]

Yes I did this when I changed my speedo face. I used my Origin B2 and my gf stuck on the needle while doing a steady 40mph.

Speedos can be upto 13% and still be legal.

[Crisis]

Haha, nice.

[Crisis]

Yeh your allowed 10% + 3 over the speed limit to allow for these errors.

So in a 30mph you can do 36, although dont do 36 cause you could easily be doing more than that due to errors!

[sotal]

yeah I did it with my mobile phone, and a bluetooth GPS receiver (looks cool because the gps is wireless and hidden in the car!) - Just looks like my phone is doing all the work!

So my phone sits in it's vent holder just to the right of the steering wheel - And runs either tomtom if i want directions to where I'm going and gatso alerts, or CamerAware if I just want my speed in big numbers with gatso alerts enabled as well.

It also logs your speed every x seconds if you want it to. You can then plot graphs etc - great for race track usage (aslong as the circuit isn't too small)

[CraigR]

Now I have 18's on my speedo is really accurate. It's fun watching people going through speed cameras and braking when they think they are going faster than they think.

[sotal]

Yeh your allowed 10% + 3 over the speed limit to allow for these errors.

So in a 30mph you can do 36, although dont do 36 cause you could easily be doing more than that due to errors!

←

The 10%+3 is on top of real world speed - So on some cars you can get away with 13%+10%+2 (if the speedo over reads by 13%)

But according to this my car overreads by less than 1% so I better be careful!

[sotal]

Just noticed I made an error in my 1st post , the last two were 47.9 and 57.9 have now corrected them to 49.7 and 59.7

oops

[stevetubbyturbo]

Yes I did this when I changed my speedo face. I used my Origin B2 and my gf stuck on the needle while doing a steady 40mph.

Speedos can be upto 13% and still be legal.

←

I always thought it was a +/- 10% tolerance for error on speedo's or am i getting mixed up with what the police allow for speeding

[Crisis]

It is 10% to allow for speedo erros but also the +3 is because you shouldn't be staring at the speedo all the time so you may crawl over it.

Sotal what phone have you got that can do that ???

[stevetubbyturbo]

It is 10% to allow for speedo erros but also the +3 is because you shouldn't be staring at the speedo all the time so you may crawl over it.

Sotal what phone have you got that can do that ???

←

Make sence

Cheers

[CraigR]

If they want to be right bast*rds they can have you for doing 1mph over the limit.

[stevetubbyturbo]

It is 10% to allow for speedo erros but also the +3 is because you shouldn't be staring at the speedo all the time so you may crawl over it.

Sotal what phone have you got that can do that ???

←

Make sence

Cheers

←

Sorry last post should have read

Makes sence (i missed the s off hope no offence caused)

[reece]

Humm, Interesting.

Very Interesting! My mum always said my car felt a lot faster at each speed than her BMW 328 did at the same time!! Now I know why - it's going faster!

It's not going faster.............. it's doing what it says on the speedo!!

[jaxx]

mine clocks in at approx 3% error comparing to sat nav and road angel

it gets progressively worse the faster you go aswell

[Demonic Angel]

So if the police allow for speedo incorrectness - how comes they can do you for doing 31 in a 30 zone if they want?

Surely you could argue that the speed wasnt entirely accurate.....?