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Old 10-11-2008   #31
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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...
It makes alot of difference.......if you (or anybody) can only be bothered to write 'text-talk' its simple ...I delete it.
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Old 10-11-2008   #32
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by AlanHod View Post
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.
Yeah thats basically it, new cars are built with a small buffer zone as it would be prohibitively expensive ensuring they are always 100% accurate.

Oh and to correct myself, Speedos are not tested in the MOT. However a working reference to the speed of the vehicle must be installed and be within the limits set by the The Road Vehicles (Construction and Use) Regulations otherwise it is not legal for driving on the public carriageway. Essentially it must not under-read, and it must not over-read by more than 10%. In my experience modern electronically controlled speedos tend to over-read by around 4% or so, giving a good margin either way on the legally defined limits.
So approximately, in a 50mph limit you could go around 59mph indicated speed and not be prosecuted based on the police guidelines. However this range varies from 57mph indicated for a fully accurate speedo to 63mph indicated if your speedo is at the opposite end of the legal limits.
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Old 11-11-2008   #33
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Re: GPS 1.9 Multijet top speed

one time me and some friends managed to get some time in at an airstrip, and i managed to hit 130 mph on a 1.4 16v and still had quite a few revs to go, but i got scared cuz it felt like the car was going to desintegrate and didnt gas it anymore after 130. I probably wont ever go that high anymore.
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Old 11-11-2008   #34
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Re: GPS 1.9 Multijet top speed

lol my standard Tjet only just managed to touch that on my private road so god knows how NA 1.4 got there.
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Old 11-11-2008   #35
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by punto_matt View Post
lol my standard Tjet only just managed to touch that on my private road so god knows how NA 1.4 got there.
Need to get it down the garage mate appears its obvious someones disconnected your turbo as you can only manage the same speed as the NA car
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Old 11-11-2008   #36
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by angelegomezsd View Post
one time me and some friends managed to get some time in at an airstrip, and i managed to hit 130 mph on a 1.4 16v and still had quite a few revs to go, but i got scared cuz it felt like the car was going to desintegrate and didnt gas it anymore after 130. I probably wont ever go that high anymore.
It must of took some doing getting back up such a steep hill as that "Airstrip" was built on
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Last edited by Kop32; 11-11-2008 at 16:21.
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Old 11-11-2008   #37
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Re: GPS 1.9 Multijet top speed

With all this over reading stuff, I thought i'd highlight a key word that most people seem to be overlooking

Speedos [b]generally[/]b over-read by about 10%

Some are more, some are less.

Judging solely by my sat nav...
An LDV Luton van I had was doing about 69 when the speedo read as 80
My Punto HGT over reads by 5-6mph at about 70.
My Lotus is pretty much spot on, 69 on the satnav is 70 on the speedo.

So the next time someone passes you in a Lotus and you think they are being an arse, consider this little fact

Chris
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Old 11-11-2008   #38
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by Kop32 View Post
It must of took some doing getting back up such a steep hill as that "Airstrip" was built on
Wasn't a jump jet airstrip with the big catapults was it?

P
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Old 12-11-2008   #39
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Re: GPS 1.9 Multijet top speed

i've heard that the remapped mjet's easily go off the clock with no trouble at all so i'd imagine easily 140 on the clock mate. I mean the tyres (if you've stuck with the manufacturer recommended one's) are rated to 150/155mph so there's no danger there and the 1.9 is a very strong engine so i can't imagine you causing any trouble...certainly not trying to test the top speed for a short period of time.

I've had my virtually standard starjet to 130 (all be it down hill and clock speed) and it was fine. Felt just as civilised as it does at 70/80 other than the fact that it was pretty high up the revs!!
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Old 20-11-2008   #40
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Re: GPS 1.9 Multijet top speed

Just got a email from road angel this morning and it states the following:

Why is the speed reading on my Road Angel different to my vehicles speedometer?
When manufacturers calibrate the speedometer on your vehicle they have to take into consideration differing tyre pressures, sizes and tread. Every manufacturer has to ensure that at no point your vehicle is travelling faster than is indicated on the in-built speedometer, thus they calibrate it accordingly. It is also for this reason that your Road Angel is generally more accurate than your vehicles speedometer, however as it works on GPS signals, there is a one to two second time-lag for the display to update.

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Old 20-11-2008   #41
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by manthatkidisscrewed View Post
i've heard that the remapped mjet's easily go off the clock with no trouble at all so i'd imagine easily 140 on the clock mate. I mean the tyres (if you've stuck with the manufacturer recommended one's) are rated to 150/155mph so there's no danger there and the 1.9 is a very strong engine so i can't imagine you causing any trouble...certainly not trying to test the top speed for a short period of time.

I've had my virtually standard starjet to 130 (all be it down hill and clock speed) and it was fine. Felt just as civilised as it does at 70/80 other than the fact that it was pretty high up the revs!!
also if the tyres say 150/155 then there will be a huge safety buffer there aswell, wouldnt want to try it but ill bet the tyres are good for easily 200.

Generally speaking in terms of safety everything is built to the rule of 3. e.g. if a lift says it takes 10 people, it should take 30 before breaking, if a winch says max load 1 ton, it will take 3 tons. and so on and so on.
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Old 20-11-2008   #42
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by beany_bot View Post
also if the tyres say 150/155 then there will be a huge safety buffer there aswell, wouldnt want to try it but ill bet the tyres are good for easily 200.

Generally speaking in terms of safety everything is built to the rule of 3. e.g. if a lift says it takes 10 people, it should take 30 before breaking, if a winch says max load 1 ton, it will take 3 tons. and so on and so on.
My tyres are good for 504 mph then matey!
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Old 20-11-2008   #43
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by Ffoxy View Post
My tyres are good for 504 mph then matey!
lol yeah im not so sure it works with tyres, it is in the constuction industry and electrical industry, stuff like that.
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Old 20-11-2008   #44
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Re: GPS 1.9 Multijet top speed

Quote Originally Posted by beany_bot View Post
lol yeah im not so sure it works with tyres, it is in the constuction industry and electrical industry, stuff like that.
Damn... I'll cancel the induction kit then...
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Old 20-11-2008   #45
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Re: GPS 1.9 Multijet top speed

you crack me up sometimes Ffoxy! lmfao

I agree with you beany...everything obviously should have a safety net...but tbh I wouldn't want to take it past the tyre safety threshold because if something happens you're not covered and also I bet it would be pretty unstable!

duncs...as far as gps speedo's go...a sat nav speed reading will be a lot more accurate...but this can depend on how many satellite's it has to triangulate at that time. There should only really be a 10mph difference at very high speeds though...
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