Inaccurate Speedo

patbhoy · 16-07-2010, 17:10

I think the speedo on my Trol is reading out by around approx 7mph, is there any way of calibrating it.

zippy656 · 16-07-2010, 17:29

bigger wheels

briggie · 16-07-2010, 17:37

mine under reads by between 5 and 7 mph .... so i need smaller wheels ?

larson · 16-07-2010, 19:00

mine is also out so i use a tom tom to see what my speedo says at 30/40/50 and never had it to seventy yet

larson

briggie · 16-07-2010, 19:08

my solution is less technical ... i know that if my speedo is reading 25 mph .... im really doing 30 , if it reads 40 mph , im doing 45mph ish

patbhoy · 16-07-2010, 22:06

Like briggie mine is under reading, 70mph on the speedo is 63mph on tomtom.
My truck is running the standard 16" alloys fitted from new so why do i have this prob.

makeitfit · 16-07-2010, 22:19

Seems to be common across the range

Mine was the same but now running 33s and it's spot on

I guess the gearing must have been designed for diff size wheels or something

Thomas-the-Terrano2 · 16-07-2010, 22:37

been here before its certainly a nissan thing but suspect all makes under read
to protect your licence, its about 10% all the way.

i use to my advantage, as good cruising speed is 65 on gauge, so actually
about 60, so can speed with van and still be legal, keeping ahead of everyone
else that is believing their speedos lol.

briggie · 16-07-2010, 22:43

Quote:

Originally Posted by patbhoy

Like briggie mine is under reading, 70mph on the speedo is 63mph on tomtom.
My truck is running the standard 16" alloys fitted from new so why do i have this prob.

no pat , my speedo says 25 mph when im actually doing 30 mph according to my sat nav

(RIP) PLANK · 16-07-2010, 23:03

mine is the same it says i'm going faster than i am going acording to tom tom

briggie · 16-07-2010, 23:04

Quote:

Originally Posted by PLANK

mine is the same it says i'm going faster than i am going acording to tom tom

mine is the reverse of that ..... it says im going slower than i actually am

makeitfit · 16-07-2010, 23:06

Ah, you need smaller wheels on your sat nav

danielj · 16-07-2010, 23:06

Check my speedo against those electronic speed signs on the side of the road which flash up your speed. Mine is about 10klm/p/h high (speedo says about 60 when sign says about 50).

briggie · 16-07-2010, 23:07

Quote:

Originally Posted by makeitfit

Ah, you need smaller wheels on your sat nav

would larger wheels on the car work ?

(RIP) PLANK · 16-07-2010, 23:09

Quote:

Originally Posted by briggie

mine is the reverse of that ..... it says im going slower than i actually am

that is a worry!

16-07-2010, 17:10	#1
patbhoy Senior Member Join Date: Jan 2010 Location: Bridge of Weir, Scotland Vehicle: Nissan Patrol GR SE 2.8TD Posts: 526	Inaccurate Speedo I think the speedo on my Trol is reading out by around approx 7mph, is there any way of calibrating it.

16-07-2010, 22:37	#8
Thomas-the-Terrano2 Moderator Join Date: Dec 2004 Location: Hackenthorpe Sheffield Vehicle: Terrano2 R20 lwb 2.7TDi Posts: 5,234	been here before its certainly a nissan thing but suspect all makes under read to protect your licence, its about 10% all the way. i use to my advantage, as good cruising speed is 65 on gauge, so actually about 60, so can speed with van and still be legal, keeping ahead of everyone else that is believing their speedos lol. __________________ M6YTB / 20YTB '60' 2010 Ford C Max Zetec 1.6i, black '56' 2006 Jeep Grand Cherokee 3.0TD, silver 2021 Bailey Pegasus Grade SE Turin caravan Smile, its more likely to confuse. One Life, Don't Just Live It, Drive a Nissan, or ...... a Jeep. Owner of Nissan 4x4s 2005 to 2019, and maybe in the future too!

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16-07-2010, 17:29	#2
zippy656 Senior Member Join Date: Aug 2008 Location: Devizes Wiltshire Vehicle: Nissan Note Ntec 1.5 Posts: 14,138	bigger wheels

16-07-2010, 17:37	#3
briggie Senior Member Join Date: Mar 2010 Location: peoples democratic republic of west yorkshire Vehicle: " alice " Posts: 10,473	mine under reads by between 5 and 7 mph .... so i need smaller wheels ?

16-07-2010, 19:00	#4
larson Senior Member Join Date: Jun 2009 Location: moomin vally Posts: 1,138	mine is also out so i use a tom tom to see what my speedo says at 30/40/50 and never had it to seventy yet larson

16-07-2010, 19:08	#5
briggie Senior Member Join Date: Mar 2010 Location: peoples democratic republic of west yorkshire Vehicle: " alice " Posts: 10,473	my solution is less technical ... i know that if my speedo is reading 25 mph .... im really doing 30 , if it reads 40 mph , im doing 45mph ish

16-07-2010, 22:06	#6
patbhoy Senior Member Join Date: Jan 2010 Location: Bridge of Weir, Scotland Vehicle: Nissan Patrol GR SE 2.8TD Posts: 526	Like briggie mine is under reading, 70mph on the speedo is 63mph on tomtom. My truck is running the standard 16" alloys fitted from new so why do i have this prob.

16-07-2010, 22:19	#7
makeitfit Senior Member Join Date: Apr 2008 Location: on the beach WEST WALES Vehicle: Maverick TDi BLACK mmm Posts: 15,136	Seems to be common across the range Mine was the same but now running 33s and it's spot on I guess the gearing must have been designed for diff size wheels or something

16-07-2010, 23:03	#10
(RIP) PLANK Senior Member Join Date: Mar 2006 Location: Central England, in the Heart of the Black Country Vehicle: T2 2004 TDI SE LWB Posts: 7,740	mine is the same it says i'm going faster than i am going acording to tom tom

16-07-2010, 23:06	#12
makeitfit Senior Member Join Date: Apr 2008 Location: on the beach WEST WALES Vehicle: Maverick TDi BLACK mmm Posts: 15,136	Ah, you need smaller wheels on your sat nav

16-07-2010, 23:06	#13
danielj Senior Member Join Date: Sep 2009 Location: Ireland Vehicle: Terrano 2.7TDI 03 LWB Posts: 695	Check my speedo against those electronic speed signs on the side of the road which flash up your speed. Mine is about 10klm/p/h high (speedo says about 60 when sign says about 50).