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Old 09-11-2008   #16
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by Im-Mia View Post
hmmm ok fare enough - well if its true - you learn something new every day

n e ways back to the point of safe top speeds for the engine???
Iirc the speedo cannot under-read at all, but can over-read by up to 10%. It's up the maker of the car how much time and money they spend getting it 100% right.
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Old 09-11-2008   #17
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by mehstg View Post
Another question for the more technical peeps, as I am feeling in an inquisitive mood today.

I was over at North Weald Airfield the other day as one of my friends works there and had the chance to take my Grande along one of the runways.

Took it up to about 115, but as the book top speed is 124, didn't want to take it any higher. The thing is, it got to 115 easily, and was still pulling hard....

I take it the fact it still pulls hard at 115 is due to the fact I have had it remapped. But obviously, other components have not been upgraded like the oil pump and i'd be worried about oil circulation at any speed higher than the quoted.

My question is, what really is a safe top speed for the car, and what damage happens if you go over this.

P
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Old 10-11-2008   #18
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Re: GPS 1.9 Multijet top speed

The M-jets will fill the clock and more after a remap. Your right about the clocks over reading, the most ive seen mines at on the Sat Nav is 141mph with still a little revs left
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Old 10-11-2008   #19
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by Im-Mia View Post
hang on a minute - i thought it was the speed camara that have a 10%....

n e ways i have never heard of the speedo under reading... that seems a little crazy... anyone one else heard of this?
No if you go through a camera the general rule is you get 10% on top of what ever the speed limit is where the camera is ie in a 30mph zone your normally fine up to 33, 50mph zone is 55mph etc etc.

Speedos generally over read by up to 10%. This is why you get a road angel or something on the go and it will tell you your true speed.

And do you have alot of keys missing from your keyboard or something?
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Old 10-11-2008   #20
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by punto_matt View Post
No if you go through a camera the general rule is you get 10% on top of what ever the speed limit is where the camera is ie in a 30mph zone your normally fine up to 33, 50mph zone is 55mph etc etc.

Quote Originally Posted by StevenRB45 View Post
Well ACPO guidelines are speedlimit + 10% plus 2 so an actual 57 mph gets you a ticket.
to quote myself earlier in the evening....
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Old 10-11-2008   #21
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Re: GPS 1.9 Multijet top speed

I am perfectly aware you said it i was just explaining it to him better.
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Old 10-11-2008   #22
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by THE POLICE GUIDELINES
The Police Service now uses technology that enables it to prove that an offence has been committed as soon as a driver exceeds the relevant speed limit by a very small margin. Motorists will therefore be at risk of prosecution immediately they exceed any legal speed limit.

The guidance to police officers is that it is anticipated that, other than in the most exceptional circumstances, the issue of fixed penalty notices and summonses is likely to be the minimum appropriate enforcement action as soon as the following speeds have been reached:

Limit Fixed Penalty Summons
20 mph 25 mph 35 mph
30 mph 35 mph 50 mph
40 mph 46 mph 66 mph
50 mph 57 mph 76 mph
60 mph 68 mph 86 mph
70 mph 79 mph 96 mph
Fixed penalty of
1. 60 (pending)
2. Licence endorsed with 3 penalty points Magisterial discretion (level 2) maximum of:
1. 1000 fine
2. Licence endorsed - range of penalty points available
3. Disqualification
4. Compulsory re-testing
This guidance does not and cannot replace the police officer's discretion and they may decide to issue a summons or a fixed penalty notice in respect of offences committed at speeds lower than those set out in the table. Moreover, in particular circumstances, driving at speeds lower than the legal limit may result in prosecution for other offences, for example dangerous driving or driving without due care and attention when the speed is inappropriate and inherently unsafe.
clearer? as thats taken directly from ACPO document.
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Old 10-11-2008   #23
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Re: GPS 1.9 Multijet top speed

I know what the laws are.
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Old 10-11-2008   #24
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Re: GPS 1.9 Multijet top speed

Quote Quote:
Originally posted by: Stripes
Oi Stripes!

lol, nah actually I actually was over there. Nowhere around here to do that on the road, police buzzing everywhere!

North Weald is only a small airfield and planes don't run out of there late, so can easily get on there in the evening

Quote Quote:
Originally posted by RossHutchie
The M-jets will fill the clock and more after a remap. Your right about the clocks over reading, the most ive seen mines at on the Sat Nav is 141mph with still a little revs left
I can believe it, was still pulling like a b*tch at 115....but I wonder what damage it is doing to the engine/turbo doing 141! Surely the oil won't get around it quick enough. Must be sitting at about 4000 revs?

P
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Old 10-11-2008   #25
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Re: GPS 1.9 Multijet top speed

Just for the record, and to aid in the discussion. I have now checked 3 separate cars speedos against actual speed using a laptop based GPS system (TomToms and the like I have found are too inaccurate and have too long a lag time for an accurate reading).

From new all 3 cars, VW Golf Mk4 2001, Volvo C70 2000, and my 2008 GP all gave an actual speed around 48mph +/- 0.5 when the speedo was reading 50. (Original tyre sizes and recommended tyre pressures)

As far as I am aware by law, and to pass an MOT the speedo must read within 10% at any time. Yes it is probably true that from new all cars over-read, but doubtfully not by as much as 10%. I find it unlikely that the starting point for any manufacturer would be at the extreme lower end of the limit otherwise any slight change in the variables of tyres would push it outside the legal limits. Such things as fluctuations in tyre temperature, vehicle weight, centrifugal forces and tread wear could all change the overall rolling diameter of the tyre, and therefore the reading on the speedo.
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Last edited by 98dizzard; 10-11-2008 at 08:40.
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Old 10-11-2008   #26
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by punto_matt View Post
No if you go through a camera the general rule is you get 10% on top of what ever the speed limit is where the camera is ie in a 30mph zone your normally fine up to 33, 50mph zone is 55mph etc etc.


And do you have alot of keys missing from your keyboard or something?
as for the 1st bit thats exactly what i said there is a 10% cussion.

as for the 2nd bit what difference does it make if i type like that? u quite clearly could read it so...
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Old 10-11-2008   #27
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Re: GPS 1.9 Multijet top speed

i wouldnt try it, but a remapped mjet should do 145+
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Old 10-11-2008   #28
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by mehstg View Post
Oi Stripes!
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Old 10-11-2008   #29
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Re: GPS 1.9 Multijet top speed

I was always lead to believe the speedo overreads by a certain amount as an 'error buffer'. So that if the speedo does become inaccurate/faulty etc chances are it will still display a speed greater then what you are actually doing.

All the cars i have driven (which is quite a few with work) and used sat nav/gps in have always overread the speed on the speedo.
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Old 10-11-2008   #30
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by Im-Mia View Post

as for the 2nd bit what difference does it make if i type like that? u quite clearly could read it so...
Because its ****ing annoying, you have a full keyboard so use it. You can understand what i say when written fully so type like that. Also there are a few members that dont use english as there first language so typing like that makes it practically impossible to understand.
Thanks raton_laveur thanked for this post
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