Speedo inaccurate ?????

[Ben-e-boy]

Mate you will find that the radar is probably only slightly inaccurate.
You may find tyres are wrong size, should be sticker in glovebox with recommended size.
The fellah who said doing 100 and radar 14 or something, these things look for vehicles speeding it had moved on looking for the next one. And when multiple lanes are there they scans alot, and alot of shadows created.
moving vehicles create shadows/blocking a reading at times for the next vechile and so you can see a funny display before it's locked in on actual speed or completely shadowed.
fairly accurate a great deal of time testing em before they are allowed on site.
but a warning only to guilt people into slowing, but sooner or later a bit further down the Rd a radar that does matter will be waiting for ya.
If ya cause an accident, their more likely to throw the book at ya instead of a lesser penalty as you had possibly been warned about going to fast, food for thought.

There wasnt any other cars on the road and it was in central queensland

[taslucas]

There wasnt any other cars on the road and it was in central queensland

may also have been just a faulty display? maybe ment to say 104 and was missing the "0" so said 1 4?

[CptClinac]

Wonderful food for thought.
Do they fiddle the odometer too. This could be a wonderful source of road tax revenue ! ! ! !

I've got a handheld gps in the boat.
Will do that tomorrow & deliver my verdict.

Yesterday I passed 3 box things and they all clocked me 8-10% over.
A week ago when we bought the truck I'm sure I passed one that clocked us within 1%.

My old Terrano had various options of gearbox etc for various configurations of vehicle. Could be tricky to find which bit is wrong in the trans train.

Thanks for the thoughts guys.

Dave

[Ben-e-boy]

Wonderful food for thought.
Do they fiddle the odometer too. This could be a wonderful source of road tax revenue ! ! ! !

I've got a handheld gps in the boat.
Will do that tomorrow & deliver my verdict.

Yesterday I passed 3 box things and they all clocked me 8-10% over.
A week ago when we bought the truck I'm sure I passed one that clocked us within 1%.

My old Terrano had various options of gearbox etc for various configurations of vehicle. Could be tricky to find which bit is wrong in the trans train.

Thanks for the thoughts guys.

Dave

When my ute was on 31's the speedo was out by about 10% (speedo was faster), with the 35's the speedo is now slower by about 5%. 33's should make it close to spot on

[CptClinac]

Did the GPS thing yesterday. Definitely 7 - 8% over. All tyres very worn. Will try with new tyres (correct size to the manual) and if req'd will change the pickoff gear to make better.

Thanks for the ideas.

From my electronics background I would suggest that the 100 kph with a radar box reading 14 was more likely to have lost the first digit. (maybe never installed!) so was trying to read 114kph.
?? Is there a group of 4x4 ers called "diesel heads" ??

Thanks for the discussion
Dave.

[CptClinac]

Tyres corrected it a bit. Now only 5%.
Will investigate the pickoff gear dodaddy. Anyone have details on this bit?

Thanks
Dave

[97_gq_lwb]

You can buy gears with a different amount of teeth from nissan.
double check these part numbers as they were from the net so might not be right.
32743-VB015 15 Teeth
32743-VB016 16 Teeth
32743-74P17 17 Teeth
32743-74P18 18 Teeth
But if it is a gq i am sure i read that you can adjust the speedo itself by 10 % either way i do remember pulling one apart and i think it was a little adjustable variable resistor on the back of it.
I had a rd28 i converted to td42 and my speedo was out by a mile i just put the rd28 gear on the td42 and it was fine.

[taslucas]

You can buy gears with a different amount of teeth from nissan.
double check these part numbers as they were from the net so might not be right.
32743-VB015 15 Teeth
32743-VB016 16 Teeth
32743-74P17 17 Teeth
32743-74P18 18 Teeth
But if it is a gq i am sure i read that you can adjust the speedo itself by 10 % either way i do remember pulling one apart and i think it was a little adjustable variable resistor on the back of it.
I had a rd28 i converted to td42 and my speedo was out by a mile i just put the rd28 gear on the td42 and it was fine.

thats interesting. so where do they get the signal from? having a variable resistor, does that mean that they have an electric signal?

[97_gq_lwb]

Yes electronic signal from the speedo sensor.

[GQshorty]

i had the same problem with my shorty i just egnoored it ahaha:P