*Donna*
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quote:
Originally posted by bradfincham
well i wouldnt want a road angel if that read 101 mph and the clocks 120 mph!!
Why not? If he got clocked at 101, then road angel was accurate, and the clocks very inaccurate.
[Edited on 09-03-2005 by Ian]
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by bradfincham
well i wouldnt want a road angel if that read 101 mph and the clocks 120 mph!!
The Road Angel is accurate, the clocks are not.
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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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i simply havent read anything inot the road angel, i would have said that it should be bang on what your clocks where as surely the clocks are accurate from new?? or everyone could argue the case there clocks were 15% inaccurate??
And im sorry on that but i didnt recall seing the blue corsa i only saw your corsa and you driving it!
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Dom
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Registered: 13th Sep 03
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quote:
Originally posted by *Donna*
quote:
Originally posted by bradfincham
well i wouldnt want a road angel if that read 101 mph and the clocks 120 mph!!
Why not? If he got clocked at 101, then road angel was accurate, and the clocks very inaccurate.
was just about to say - GPS, accurate to 3ft vs the cars clocks that are about as accurate as an arthritis ridden person aiming of the loos bowl 
[Edited on 09-03-2005 by Dom]
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*Donna*
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Registered: 14th Sep 04
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quote:
Originally posted by bradfincham
i simply havent read anything inot the road angel, i would have said that it should be bang on what your clocks where as surely the clocks are accurate from new?? or everyone could argue the case there clocks were 15% inaccurate??
And im sorry on that but i didnt recall seing the blue corsa i only saw your corsa and you driving it!
Clocks typically over read, the faster you go, usually the more they over read. Its against the law for them to under read. I would say no car speedo is accurate, however, a Road Angel is. 
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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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on pauls case i work out (crap maths) his clocks are 20% higher than the road angel??
Are you saying that when im doing an alledged 70 mph in my car im actually doing 56mph??
mmmm
[Edited on 09-03-2005 by bradfincham]
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*Donna*
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Registered: 14th Sep 04
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quote:
Originally posted by Dom
quote:
Originally posted by *Donna*
quote:
Originally posted by bradfincham
well i wouldnt want a road angel if that read 101 mph and the clocks 120 mph!!
Why not? If he got clocked at 101, then road angel was accurate, and the clocks very inaccurate.
was just about to say - GPS, accurate to 3ft vs the cars clocks that are about as accurate as an arthritis ridden person aiming of the loos bowl
[Edited on 09-03-2005 by Dom]
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Dom
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Registered: 13th Sep 03
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quote:
Originally posted by *Donna*
quote:
Originally posted by bradfincham
i simply havent read anything inot the road angel, i would have said that it should be bang on what your clocks where as surely the clocks are accurate from new?? or everyone could argue the case there clocks were 15% inaccurate??
And im sorry on that but i didnt recall seing the blue corsa i only saw your corsa and you driving it!
Clocks typically over read, the faster you go, usually the more they over read. Its against the law for them to under read. I would say no car speedo is accurate, however, a Road Angel is.
unlike cars clocks, GPS is the opposite - its less accurate at lowers speeds, but the faster you go the better it gets 
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Paul_J
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Registered: 6th Jun 02
Location: London
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Yeh my Pug clocks over read about 5 mph even at 40 mph! ... Over 100 mph you can truely see how inacurate it gets ...
Even though the Revs are still showing say 4.5k and thus the speedo is showing 90 mph - the road angel may only be showing like 82 mph!
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*Donna*
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Registered: 14th Sep 04
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quote:
Originally posted by bradfincham
on pauls case i work out (crap maths) his clocks are 25% higher than the road angel??
Are you saying that when im doing an alledged 70 mph in my car im actually doing 56mph??
mmmm
You never know, i have tested a road angel in my fathers car. Road Angel read 30mph, car speedo read 37mph. Thats 7mph out at just 30mph
[Edited on 09-03-2005 by *Donna*]
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Dom
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Registered: 13th Sep 03
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quote:
Originally posted by bradfincham
on pauls case i work out (crap maths) his clocks are 25% higher than the road angel??
Are you saying that when im doing an alledged 70 mph in my car im actually doing 56mph??
mmmm
at the end of the day does it really matter??
he got a tanned arse, hes prolly gonna pay through the nose for it - i wouldnt worry about it 
Same as nismo mate, at the end of the day theres worse things to loose sleep over than what he/she/it said on the internet about this and that
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Paul_J
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Registered: 6th Jun 02
Location: London
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quote:
Originally posted by bradfincham
on pauls case i work out (crap maths) his clocks are 25% higher than the road angel??
Are you saying that when im doing an alledged 70 mph in my car im actually doing 56mph??
mmmm
Because my friend... It's all dependant on speed... At 56 mph the clocks won't be that inacurate...
I don't know how you work out 25% inaccurate anyway? I said when I'm doing about 90 mph on clocks it shows about 83 mph on road angel... when I'm doing 115 mph on clocks it only shows about 103ish on road angel.
Considering the speedo over-reads about 4/5 mph when Im doing about 40 mph ... I would imagine it'd get more inacurate as I get quicker.
[Edited on 09-03-2005 by Paul_J]
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by Paul_J
I don't know how you work out 25% inaccurate anyway?
Difference between the speeds as a percentage of the higher one (or the lower one if you want to make it look more).
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Paul_J
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Registered: 6th Jun 02
Location: London
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quote:
Originally posted by Ian
quote:
Originally posted by Paul_J
I don't know how you work out 25% inaccurate anyway?
Difference between the speeds as a percentage of the higher one (or the lower one if you want to make it look more).
Yes... and from 115 and 103 mph you get 25 %?
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bradfincham
Member
Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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no ive spoken through u2u with paul, hes a good bloke just was unlucky
but im intrigued into how different the speedo and roadangel are,
so if all manufacturers were to use a road angel for 0-62 mph tests you say that the times would increase (if road angel was more accurate slower speeds)
so for example
In the ultima i have seen 165 mph on the clocks - stack dash!
would that equate to only 132 mph on the road angel??
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by bradfincham
In the ultima i have seen 165 mph on the clocks - stack dash!
would that equate to only 132 mph on the road angel??
If you assume that an Ultima with a stack dash has the same margin of error as the 106 - unlikely.
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*Donna*
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Registered: 14th Sep 04
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stack dash - being the key word in your post
[Edited on 09-03-2005 by *Donna*]
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Paul_J
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Registered: 6th Jun 02
Location: London
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quote:
Originally posted by bradfincham
no ive spoken through u2u with paul, hes a good bloke just was unlucky
but im intrigued into how different the speedo and roadangel are,
so if all manufacturers were to use a road angel for 0-62 mph tests you say that the times would increase (if road angel was more accurate slower speeds)
so for example
In the ultima i have seen 165 mph on the clocks - stack dash!
would that equate to only 132 mph on the road angel??
I'm hoping mate manufacturers don't test their 0-62 mph with a speedo and a stop watch and use proper timing gear.
165 mph would more likely be say 149 mph or something like that... But its more dependant on how the tyres expand mate. High profile soft tyres are more likely to expand at higher speed than lower profile tyres I'd assume.
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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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no 101 + 25% = 126 mph as you said clocks have read
im just intrigued thats all, how far in accurate the clocks are
ian im not trying to make it look worse/better as i said im just intrigued to how accurate/inaccurate all this stuff is
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Paul_J
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Registered: 6th Jun 02
Location: London
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Also Brad... Next time we meet up - I'll put the Road Angel in your car and we'll go for a spin... Just out of interest see what we get?
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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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mm, yeh i can see all the maths behind and the tyre walls etc i just fid it shocking to see how different these really are!
so my corsa could never do 130 mph realistically more like 120 ish?
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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Doesn't the stack dash take speed signal from the rear wheel ABS sender? Program it with tyre size and it should be fairly accurate.
Standard car stuff uses stepped down gearbox motion which goes through another analogue phase when you turn it in to a reading. Its asking for trouble.
GPS sensors know where you are to within a few metres and also as each reading it date stamped to a few hundredth of a second, how long it too you to get there. Far better way of doing it.
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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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ok the ultima was a bad case but thats the fastest ive ever driven,
how about a supra for example??
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Paul_J
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Registered: 6th Jun 02
Location: London
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quote:
Originally posted by bradfincham
no 101 + 25% = 126 mph as you said clocks have read
im just intrigued thats all, how far in accurate the clocks are
ian im not trying to make it look worse/better as i said im just intrigued to how accurate/inaccurate all this stuff is
No...? 126 mph where did you get this figure? first you said I said I was doing 130 mph, then you said I was doing 120, now your saying I was doing 126 mph??? Make your mind up
I walked into the pub and said I might of been doing 120 mph on the clocks ... I thought I cleared this up in the u2u I sent.
I have no idea when they clocked me mate. but they definately didn't use laser equipment as the road angel would of picked that up - They saw the road angel and thus used a technique of matching my speed, with their Calibrated speedo and then keeping a equal distance.
They claimed I was clocked doing 101 mph as I passed them. (meaning on the inside lane they were doing 101 mph also!!!) ... but the fact I passed them, I accelerated a bit more... Then later I noticed blue lights behind me.
I said 'I saw 120 ish on my clocks!' - I did not say, 'At the EXACT moment they clocked me at 101 mph, I saw 120 on my clocks / road angel / whatever!!!!'...
Give it a rest mate.
Paul J
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*Donna*
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Registered: 14th Sep 04
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quote:
Originally posted by bradfincham
ok the ultima was a bad case but thats the fastest ive ever driven,
how about a supra for example??
Supra, standard road car, speedo will just be as inaccurate as the majority of other road cars
[Edited on 09-03-2005 by *Donna*]
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