speedo out. - Page 2

R1cho · 16-02-2013, 00:52

ok so ur speedo says ur doin 30 and satnav says u aint? its getttin confusing now because before it was being said that speedo reads 30 satnav reads above, if ya sat nav is reading lower than ya speedo then its common with most cars, i've had at least five cars where the speedo says 30 but the satnav says 25, its all to do with tyres sizes,,,,,,,,,look it up

danielj · 16-02-2013, 00:55

Quote:

Originally Posted by R1cho

ok so ur speedo says ur doin 30 and satnav says u aint? its getttin confusing now because before it was being said that speedo reads 30 satnav reads above, if ya sat nav is reading lower than ya speedo then its common with most cars, i've had at least five cars where the speedo says 30 but the satnav says 25, its all to do with tyres sizes,,,,,,,,,look it up

Don't have sat nav. Tyres are standard as per manufacture spec. Maybe speed thingys on road side are set a bit high?

R1cho · 16-02-2013, 00:59

Quote:

Originally Posted by danielj

Don't have sat nav. Tyres are standard as per manufacture spec. Maybe speed thingys on road side are set a bit high?

doesn't answer the question tho,,,,is ya speedo readin higher than ur actual speed or lower than ur actual speed? as said its tyre sizes i run 33's they run about spot on so when my speedo says i'm doing 30 or 70 thats the speed i'm doing

danielj · 16-02-2013, 01:00

Quote:

Originally Posted by R1cho

ok so ur speedo says ur doin 30 and satnav says u aint? its getttin confusing now because before it was being said that speedo reads 30 satnav reads above, if ya sat nav is reading lower than ya speedo then its common with most cars, i've had at least five cars where the speedo says 30 but the satnav says 25, its all to do with tyres sizes,,,,,,,,,look it up

Sorry! Your'e right. I got it wrong way round. The original question was as you say, speedo reading too low not too high. Tyre size would seem the most obvious reason. Thanks for the correction.

danielj · 16-02-2013, 01:01

Quote:

Originally Posted by R1cho

doesn't answer the question tho,,,,is ya speedo readin higher than ur actual speed or lower than ur actual speed? as said its tyre sizes i run 33's they run about spot on so when my speedo says i'm doing 30 or 70 thats the speed i'm doing

Again, your'e correct. When I did increase tyre size for a while speedo was more or less in line with speed signs on side of road.

R1cho · 16-02-2013, 01:04

ok so solution is what every one said lol, standard tyres on the terrano you think you're doing 30mph but u aint its more like 25mph, biger tyres adjust this tho, i run 33's and my speed is aboust as acurate as it can be, i do 30mph it reads 30mph on a radar gun (thanks to plod i know) and the street signs that flash the speed at ya it also is same at 70mph

danielj · 16-02-2013, 01:16

Quote:

Originally Posted by R1cho

ok so solution is what every one said lol, standard tyres on the terrano you think you're doing 30mph but u aint its more like 25mph, biger tyres adjust this tho, i run 33's and my speed is aboust as acurate as it can be, i do 30mph it reads 30mph on a radar gun (thanks to plod i know) and the street signs that flash the speed at ya it also is same at 70mph

A bit of a tangent I know but anywhere on here you have posted a picture of your truck with those Kuhmo 33's. Would like to see that.

R1cho · 16-02-2013, 01:38

R1cho · 16-02-2013, 01:40

AD Ent · 17-02-2013, 20:02

Quote:

Originally Posted by AD Ent

It's normal.
Police cars have calibrated speedos, T2's don't, GPS is calibrated. Terrano speedo is a joke, of all the cars I've tested a GPS App in, It's by far the worse. Mine is on standard 16" wheels and tyres, 235/70/16. 90=80 80mph=70mph 60mph=53mph Bigger the tyres the better it will be.
'Makeitfit' will be along soon with a cure.....

The Big question is.... Have our T2's done LESS Miles than it shows??????? I'm testing this tomorrow.....

right did a steady motorway journey. Google maps had it at 45 miles. I zero`d the trip.. At journeys end it read 49.7miles. Out by 4.7miles on a 45mile journey.

Based on that, our T2's have done 10% less miles than it shows on the clock. This affects MPG calculations too.

Lazy-Ferret · 17-02-2013, 20:26

Quote:

Originally Posted by AD Ent

right did a steady motorway journey. Google maps had it at 45 miles. I zero`d the trip.. At journeys end it read 49.7miles. Out by 4.7miles on a 45mile journey.

Based on that, our T2's have done 10% less miles than it shows on the clock. This affects MPG calculations too.

Good point....

Will have a look at ours next time we do a good run in her.

jims-terrano · 17-02-2013, 20:26

Quote:

Originally Posted by R1cho

Where's this? I recognise it but can't place it.

Ta

R1cho · 17-02-2013, 20:33

Quote:

Originally Posted by jims-terrano

Where's this? I recognise it but can't place it.

Ta

Holmfirth, ramsdon road it was a bit twisty

danielj · 17-02-2013, 21:23

Quote:

Originally Posted by R1cho

Thanks for that.

Veeerrrry nice! Look the real business.

mr tickle · 18-02-2013, 11:59

Quote:

Originally Posted by Lazy-Ferret

Good point....

Will have a look at ours next time we do a good run in her.

This is a very good point.

I have known that my speedo is out by 11% since the day I bought her. I'm not the only one either.
Its no problem at any speed as I compensate accordingly

Speedo 78 mph = actual 70 (11%)
Speedo 70 mph = actual 63 (11%)
Speedo 33.5 mph = actual 30 (11%)

My bus has done a recorded 105k miles = actual 94.5k

My calculated MPG is 25 around town 28 on a run = actual 22.5mpg and 25

It is worth considering.

16-02-2013, 00:52	#16
R1cho Senior Member Join Date: Aug 2010 Location: Wales Vehicle: 1997 LandCruiser Colorado Posts: 4,201	ok so ur speedo says ur doin 30 and satnav says u aint? its getttin confusing now because before it was being said that speedo reads 30 satnav reads above, if ya sat nav is reading lower than ya speedo then its common with most cars, i've had at least five cars where the speedo says 30 but the satnav says 25, its all to do with tyres sizes,,,,,,,,,look it up

16-02-2013, 01:04	#21
R1cho Senior Member Join Date: Aug 2010 Location: Wales Vehicle: 1997 LandCruiser Colorado Posts: 4,201	ok so solution is what every one said lol, standard tyres on the terrano you think you're doing 30mph but u aint its more like 25mph, biger tyres adjust this tho, i run 33's and my speed is aboust as acurate as it can be, i do 30mph it reads 30mph on a radar gun (thanks to plod i know) and the street signs that flash the speed at ya it also is same at 70mph

16-02-2013, 01:38	#23
R1cho Senior Member Join Date: Aug 2010 Location: Wales Vehicle: 1997 LandCruiser Colorado Posts: 4,201

16-02-2013, 01:40	#24
R1cho Senior Member Join Date: Aug 2010 Location: Wales Vehicle: 1997 LandCruiser Colorado Posts: 4,201