What it is the error tolerance in a LR speedometer?

**Chucaro** · 2nd March 2009, 11:53 AM

Under the changes previously flagged by the government, anyone detected traveling up to 10km/h over the speed limit will lose one demerit point. Ref HERE

Than means that if the speedo of your LR shows 50 KPM and you are in a 50 kph and the radar detects 52 kph you are loosing 1 point demerit point?

How the drivers are going to know the precision of the speedometer in their car if it is not checked on the yearly inspection on the cars in NSW and there is not compulsory inspection in interstate cars?

Seems to me that it is another blunder from the dogooders or just to raise money

**rick130** · 2nd March 2009, 01:44 PM

Defender speedos are generally 7-8% out, ie. with 'standard' tyres and 100km/h indicated you are actually doing 92-93km/h.

**29dinosaur** · 2nd March 2009, 01:52 PM

mmm. sore point... have been 'done' twice in the last week at same camera.

First I didn't even realize, but notice came in post this am. Second, I saw the flash at same time as looking down at speedo which was reading approx 84kph (in 80zone). So am expecting second notice by end of this week... 3 points for under 15kph, over limit and $88.00 per pop. Grrrrrrrr. (North bound lane near Wollongong Uni. Boy there are a lot of speed cameras in the Illawarra).

So I reckon the D2 is pretty accurate. (Will check with my GPS some time).

**abaddonxi** · 2nd March 2009, 02:03 PM

My 130 runs at 8% off. Checked many times with GPS and those roadside counters.

Dunno about the 110.

Simon

**aew849** · 2nd March 2009, 02:05 PM

Lived in NSW 1998 to 2006 and always wondered why the speeding fines hit you with 3 points straight up....now they have finally come up with a plan for more revenue (coz they're broke) by reducing the points per low level speeding (WA has been doing this for yonks).

The rozzers can now do you 12 times vice 4 times for low level speeding, thus getting 3 times more money out of a driver before suspension.

WRT to speedo's...with 33" tyres on the 130 (BFG 255/85R16 MT's) the speedo is now spot on (+/- 1%). Previous smaller dia GY Wranglers had a 10%over read. These speeds were checked and averaged with a handheld 12 channel GPS on the 1700km trip to Karratha with the Wranglers, and from Karratha with the MT's.

**incisor** · 2nd March 2009, 02:09 PM

my old girl is doing 100kph when the speedo tells me it is doing 83kph

great on the flats, sucks big rocks on hills

**Chucaro** · 2nd March 2009, 02:18 PM

Just wonder about the time delay on the GPS and if it accurate enough to dispute a fine?

**spudboy** · 2nd March 2009, 02:43 PM

How can you dispute the fine with a GPS?

Their equipment is presumably calibrated or certified on a regular basis.

**Chucaro** · 2nd March 2009, 02:47 PM

Originally Posted by spudboy

How can you dispute the fine with a GPS?

Their equipment is presumably calibrated or certified on a regular basis.

If the GPS have history storage, you have a clean records and have a history of faulty radars used by the authorities you can have some weight to defend yourself in Court.
The court can order to inspect the radar in question.
I remember few years ago a light post in Hobart was detected of doing over 100 kph

**PhilipA** · 2nd March 2009, 03:26 PM

I do not know where this idea of +-10% accuracy of speedos cpomes from.

I am sure that ADRs specify that speedos must have an accuracy of 0 to +10%.

That is why all speedos on new cars with standard tyres are optomistic.

You will never find a new car with a pessimistic speedo.

So will all the dreamers who think their speedos are pessimistic please get over it, unless they have changed their tyres of course. And then they should have the wit to know they have changed their speedo reading.
Regards Philip A

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