Listen to this....i am well pissed off... - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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Neilyp

Member

Registered: 1st Apr 02
Location: Scotland Drives: 1.2 16v
User status: Offline

14th May 03 at 10:29

yes

Neilyp

Member

Registered: 1st Apr 02
Location: Scotland Drives: 1.2 16v
User status: Offline

14th May 03 at 10:47

anyone know how and where i can get my speedo adjusted?

Cosmo

Member

Registered: 29th Mar 01
Location: Im the real one!
User status: Offline

14th May 03 at 10:50

could you not tell that it felt faster than 53mph?

Sam

Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline

14th May 03 at 10:51

quote:
Originally posted by Neilyp
anyone know how and where i can get my speedo adjusted?

I think you can get your speedo recalibrated, not sure who would do that though?

Neilyp

Member

Registered: 1st Apr 02
Location: Scotland Drives: 1.2 16v
User status: Offline

14th May 03 at 18:20

help?

MattyB

Member

Registered: 13th Nov 01
Location: 118.5bhp :D
User status: Offline

14th May 03 at 20:57

thats is very very odd...........i think u have a prob some where. I have 16"s in on my corsa B......and when the speedo shows 60, i am doin 57. At 70, actually doin 66.

Thats tested with VERY expensive GPS equipment along a dead straight roman road!

Matt

bobothebear

Member

Registered: 13th Jan 03
Location: bedfordshire
User status: Offline

15th May 03 at 10:57

Sounds like your Speedometer is way out Mattyb.

With bigger wheels, the axle will turn fewer times to cover the same distance, so the speedometer will think the car is going slower.

Steve

Premium Member

Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline

15th May 03 at 10:59

quote:
Originally posted by MattyB
thats is very very odd...........i think u have a prob some where. I have 16"s in on my corsa B......and when the speedo shows 60, i am doin 57. At 70, actually doin 66.

Thats tested with VERY expensive GPS equipment along a dead straight roman road!

Matt

I do my testing down VERY straight Agentinian roads

Sooty

Banned

Registered: 9th Mar 03
Location: FLAP CENTRAL
User status: Offline

15th May 03 at 11:00

quote:
Originally posted by MattyB
thats is very very odd...........i think u have a prob some where. I have 16"s in on my corsa B......and when the speedo shows 60, i am doin 57. At 70, actually doin 66.

Thats tested with VERY expensive GPS equipment along a dead straight roman road!

Matt

its usually the other way around, 60 on your speed will be about 63mph

Poot

Member

Registered: 30th Jan 05
Location: Wales/midlands drives: 1.6 16v
User status: Offline

2nd Jul 05 at 12:54

When I had 16's on mine, the profile was 195/45/16, the height of the tyres were very nearly the same, the 14's previously being 185/60/14's.

I now have 15's on 195/45's, and these are the identical same height as the 14's.

I used a tyre calculator or something I found through this website, worked out that my speedo would be something like .75% out at 70mph...

which to me is naff all

Jules

Member

Registered: 26th Nov 04
Location: Ipswich, Suffolk Status: Happy
User status: Offline

2nd Jul 05 at 13:09

If you're using the correct size tyres (profile) then the total rolling radius of your 16"s + tyre is barely different from a standard 14" + tyre, yes the speedo will be out but only by a few MPH and not 10MPH as you say - unless you're using high profile tyres on bigger wheels in which case the total rolling radius of them will be far bigger than what the standard wheels and tyres would be.

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

2nd Jul 05 at 13:22

quote:
Originally posted by elfunkyo
Thought you were allowed about 10% leniency when caught speeding? therefore 53.5mph would not be breaking the law.

Yeah, but he was doing 63, the fact the speedo is wrong has nothing to do with what he was clocked doing. They don't look in your car and check your speedo, they bounce radar off your bumper and make their own decisions.

StuartVRS

Member

Registered: 9th Feb 03
Location: Bromley Common, Greater London
User status: Offline

2nd Jul 05 at 13:23

2 years old

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

2nd Jul 05 at 13:28

quote:
Originally posted by Neilyp
that means my speedo was reading 53.5mph when i was actually doing 63!

This assumes that your speedo is exactly accurate, which is very, very, very unlikely.

By law speedo can over-read by up to 10% but CANNOT under-read, so if anything a bigger set of wheels usually makes your speedo more accurate than factory due to the over-read margin.

The difference between a 145/80/13 and a 195/45/16 is 3.56%

The difference between a 145/80/13 and a 195/40/16 is 0% - they both have a mathmatical diameter of 562mm.

To get a tyre 15% bigger you either have the only Corsa in the country which came with 11" steelies or your tyre choice is VERY wrong.

Either way, borrow a TomTom, Road Angel or buy one of these for your laptop - http://www.gpsw.co.uk/details/prod519.html - and get out there and check it.

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

2nd Jul 05 at 13:28

quote:
Originally posted by StuartA3Turbo
2 years old

Oh yeah

StuartVRS

Member

Registered: 9th Feb 03
Location: Bromley Common, Greater London
User status: Offline

2nd Jul 05 at 13:32

quote:
Originally posted by Ian

quote:
Originally posted by StuartA3Turbo
2 years old
Oh yeah

not only that he hasnt even been active since january, i think this is one for the trash can

Ian

Site Administrator

Registered: 28th Aug 99
Location: Liverpool
User status: Offline

2nd Jul 05 at 13:37

Not really, its useful to other people, as it will be posted again at some point.

the_legend_of_yrag

Member

Registered: 7th Jul 03
Location: Cambridgeshire
User status: Offline

2nd Jul 05 at 13:54

theres a i got caught speeding post every day anyway isn't there?

Jonny P

Member

Registered: 11th Dec 04
Location: Merseyside Drives: Civic Type R EP3
User status: Offline

2nd Jul 05 at 14:32

quote:
Originally posted by Sam
Even if you were doing 53.5mph you still broke the law as the speed limit is 50!

he broke the law but he wouldnt have got fined

as far as i know ur allowed to do

10% over the speed limit which makes it 55

so he would not of got fined if his speedo was right

Jonny P

Member

Registered: 11th Dec 04
Location: Merseyside Drives: Civic Type R EP3
User status: Offline

2nd Jul 05 at 14:33

omg i dont read through threads

i really should

Ben

Banned

Registered: 12th Jan 03
Location: West Yorkshire
User status: Offline

2nd Jul 05 at 18:09

its affected mine by 1 or 2 mph , ive used gprs and i presume thats more accurate

Twiggy

Member

Registered: 15th Oct 04
User status: Offline

2nd Jul 05 at 18:45

"Listen to this"

I cant hear anything...is there a link???

Dan B

Member

Registered: 25th Feb 01
User status: Offline

2nd Jul 05 at 20:01

And, for the next person to ask how much difference putting new-sized wheels on:

http://www.miata.net/garage/tirecalc.html

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