Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club General Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 7th September 2015, 16:07   #21
gozo ken
Avid contributor
 
R75 SALOON

Join Date: Feb 2013
Location: Lincolnshire
Posts: 226
Thanks: 20
Thanked 57 Times in 44 Posts
Default

They all seem to do it,,Tyre and wheel sizes can affect it also.
On the other hand my classic car ''under reads''so I've got to be careful.
Anyone not having an 'IPK' MPH reading,then I found a free app' on my mobile gives a digital readout and also can give a HUD heads up display on the windscreen when placed on the dash.
Ken.
gozo ken is offline   Reply With Quote
Old 7th September 2015, 17:19   #22
James.uk
Passed Away
 
2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles

Join Date: Dec 2008
Location: Near the M67.
Posts: 14,509
Thanks: 199
Thanked 585 Times in 397 Posts
Default

As stated, a 10% over read is pretty standard in the UK... innit..
...
James.uk is offline   Reply With Quote
Old 7th September 2015, 17:57   #23
arnosvale65
Posted a thing or two
 
75 facelift CDTi Connie SE Tourer. MGF 1.8 VVC

Join Date: Jul 2014
Location: bristol
Posts: 1,424
Thanks: 176
Thanked 176 Times in 119 Posts
Default

I have a Scan gauge permanently connected to my OBD2 port and it, like everyone's sat nav, shows an error of 3mph at 30 and 5mph at 60. While talking about this subject does the law still allow 10% error for speeding or has this come to be a generally understood phenomena due to all our speedos over reading?
In my trucking days I always kept my truck on the limiter(55mph) and never once got pulled up for speeding in roadworks. Due to what I have read on this thread about speedos being set to read higher than actual speed in a truck this is downright bad practice. With a digital tachograph any speed over the limit(85kph) comes up as an overspeed and UK police have been known to issue fines and points on this evidence. This speed is actually below the speed limit for trucks on motorways which is set at 60mph. How can that make sense? I know it is an EU rule (85kph) but the Spaniards have an exemption. Why don't we?
__________________
Onwards and upwards. MGZT-T MK1 front and rear ends fitted, specialist- components in line thermostat mod done, retro fitted cruise control, Mk1 real wood dash fitted, real walnut steering wheel fitted, Pioneer DAB radio fitted.



Last edited by arnosvale65; 7th September 2015 at 18:02..
arnosvale65 is offline   Reply With Quote
Old 7th September 2015, 18:02   #24
hamster19
Gets stuck in
 
tourer conn CDTI

Join Date: Feb 2014
Location: morpeth,northumberland
Posts: 834
Thanks: 381
Thanked 112 Times in 105 Posts
Default

Quote:
Originally Posted by IverRover View Post
I wasn't aware you could have a digital readout enabled on the ipk but as it would appear this gives a different reading to the speedo, I wonder if this 'common fault' is due to the mechanism that drives the speedo? Is is electronic or as in days of old, a worm drive in the gearbox on the end of a cable between the two (gearbox and speedo), and the drive wearing with age or just purely poorly designed.
I have a one, and it is the one I use, thanks to super guru Brian
hamster19 is offline   Reply With Quote
Old 7th September 2015, 19:35   #25
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

Both the analogue dial and digital readout get their information from the same source - the OSF ABS wheel sensor.

Interestingly on the V8's where the digital readout was factory enabled, it has been reported that it matches the analogue speedo, so they must have tweaked something.
Mike Noc is offline   Reply With Quote
Old 7th September 2015, 19:43   #26
another_clean_sheet
Posted a thing or two
 
another_clean_sheet's Avatar
 
Rover 75 CDTI Tourer

Join Date: Nov 2014
Location: Great Bardfield, nr Braintree
Posts: 1,409
Thanks: 303
Thanked 436 Times in 317 Posts
Default

Quote:
Originally Posted by arnosvale65 View Post
I have a Scan gauge permanently connected to my OBD2 port and it, like everyone's sat nav, shows an error of 3mph at 30 and 5mph at 60. While talking about this subject does the law still allow 10% error for speeding or has this come to be a generally understood phenomena due to all our speedos over reading?
In my trucking days I always kept my truck on the limiter(55mph) and never once got pulled up for speeding in roadworks. Due to what I have read on this thread about speedos being set to read higher than actual speed in a truck this is downright bad practice. With a digital tachograph any speed over the limit(85kph) comes up as an overspeed and UK police have been known to issue fines and points on this evidence. This speed is actually below the speed limit for trucks on motorways which is set at 60mph. How can that make sense? I know it is an EU rule (85kph) but the Spaniards have an exemption. Why don't we?
The police do not have to allow a 10% error for speeding. This is because if you drive at an indicated 30mph you would not be speeding as your speed would be about 27 mph. To be caught speeding you must have been driving with an indicated speed above the speed limit.
another_clean_sheet is offline   Reply With Quote
Old 8th September 2015, 13:16   #27
Dorset Bob
Senior Citizen
 
Dorset Bob's Avatar
 
Rover 75 2.5 Connoisseur SE,Chrysler 300C,124 Spider, Daytona 955i,Honda XL250 & Royal Enfield 650GT

Join Date: Feb 2008
Location: The Kingdom of Wessex
Posts: 6,976
Thanks: 2,391
Thanked 2,685 Times in 1,686 Posts
Default

There is a thread here if anyone has an hour to spare.
__________________



Let the good times roll............



Dorset Bob is offline   Reply With Quote
Old 8th September 2015, 13:36   #28
DragonFly
Loves to post
 
Non 75

Join Date: Aug 2014
Location: Bristol
Posts: 471
Thanks: 56
Thanked 189 Times in 93 Posts
Default

Quote:
Originally Posted by another_clean_sheet View Post
The police do not have to allow a 10% error for speeding. This is because if you drive at an indicated 30mph you would not be speeding as your speed would be about 27 mph. To be caught speeding you must have been driving with an indicated speed above the speed limit.
Yes and no.... The police don't have to allow it, but ACPO (as was) guidelines state an allowance of 10%+2MPH before a driver is considered for prosecution (or a ticket).

In effect, this means that you'd have to be travelling at an actual speed of 36MPH in a 30, 47MPH in a 40, 58MPH in a 50 etc before you'd get a ticket. But, it's up to the force concerned (and indeed to individual officers) where they draw the line.
DragonFly is offline   Reply With Quote
Old 9th September 2015, 19:54   #29
gozo ken
Avid contributor
 
R75 SALOON

Join Date: Feb 2013
Location: Lincolnshire
Posts: 226
Thanks: 20
Thanked 57 Times in 44 Posts
Default

I got done for doing 34 in a 30 area.
So anyone stuck behind me ,when I'm doing the speed limit,can 'jog on' and go past me.
gozo ken is offline   Reply With Quote
Old 9th September 2015, 21:51   #30
Frank Incensed
Ex 75 Owner
 
Frank Incensed's Avatar
 
75 Tourerless

Join Date: Jul 2010
Location: Manchester
Posts: 2,147
Thanks: 60
Thanked 156 Times in 93 Posts
Default Discretion & Guidelines Being Binned

Quote:
Originally Posted by DragonFly View Post
Yes and no.... The police don't have to allow it, but ACPO (as was) guidelines state an allowance of 10%+2MPH before a driver is considered for prosecution (or a ticket).

In effect, this means that you'd have to be travelling at an actual speed of 36MPH in a 30, 47MPH in a 40, 58MPH in a 50 etc before you'd get a ticket. But, it's up to the force concerned (and indeed to individual officers) where they draw the line.
We have been warned!

http://www.mirror.co.uk/news/uk-news...rs-who-6166737

Be careful out there!
__________________
Beyoncé's Green Light Used More Rubber

355188 of 355194
Frank Incensed is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:04.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd