How speed limited is "100 speed limited"

Nope... but most people assume that... which is why they go "You @#$%@#$
my car/bike speedo is accurate!" "Your bus/truck was doing almost 110!"

G-S

 

Ah, well. Any idea how the speedo needle is positioned, assuming
it has one?

-----sharks

 

Can ye work this magical riddle?

Have ye heard of the magical.....

Hammo (magnets of course, the prevent arse cancer...)

 

It's easier (and pretty cheap) to make an accurate oddomoter, it's exxy
to make accurate speedos...


G-S

 

Yah, tyres are another reason... they can make a few % difference even
within the same size rating.


G-S

 

Actually, unless my GPS is inaccurate, my car speedo is.

Haven't gotten around to finding the GPS and taking it for a ride
on the yzf as yet. The ZZR250 read quite a bit over actual speed
though.

GB

 

I've often wondered if one can assume that the speed reading is
accurate on the strength of the odometer performance, or vice
versa.

GB

 

A stepper motor is one way of positioing a needle in a completely
electronic setup - might be more expensive than the average speedo
manufacturer wants to go for though.

A computer floppy disc drive costs ten bucks retail, so the stepper
motor in that is, as one of the more expensive components in a fdd,
probably fifty cents at manufacturing time. The same stepper would
work fine (or probably even be overkill) in a speedo, but that
fifty cents is getting a bit pricey for a component in a mass
produced item like a speedo!

GB

 

Bollocks. A very occasional punter might very occasionally
stick the GPS up where he can see it to get a feel for how
well the speedo works, but every day, I think not.

No its not.

You'd make a good Sydney Buses driver - know how to send an SMS
message on a telephone while driving?

GB (the real GB)

 

That's interesting commentary, specially since I have a long held
(from repeated bad experiences) perception that auspost drivers are
the most aggressive drivers out there, particularly with the pantechs
they use in metropolitan and residential areas.

(On the open road, its Toll Logistics that seem to push the hardest,
though perhaps the new 'customer pays' laws will help slow those
mad fuckers down a bit).

Typical 'professional' driver's attitude methinks.


(I'm a strong supporter of the death penalty for short haul metropolitan
bus drivers - if they express a desire for employment as a bus driver, just
shoot them! I'd have no problem with the same being applied to metropolitan
auspost drivers - they're every bit as barking mad IME)


GB

 

IME, Aus Post are *never* a problem on the open road. It's around
town that they're complete fucking nutters.

GB

 

Yet with the Sprint, despite the woefully optomistic speedo, the
odometer is within 1% accuracy. I haven't noticed any particular
difference with different tyres (020s or MEZ4s) although I haven't
been particulary rigourous in checking accuracy (occasional checks
using line marked roads).

cheers,

Bill_h

(remove the nospam bit for email)

 

That should be optimistic. Don't you love being your own spilling
nazi?

Bill_h

(remove the nospam bit for email)

 

Well, perzactly. Is that what they use? If they do, I've got no
problem believing that the speedo is within 1%. If they're using
a servo, less so. If they're driving a moving-coil meter or
something, much less so!

-----sharks

 

You won't get an argument from me on that one.
That is one of the reasons why I think the "pantechs" as you call them
are being fitted with data loggers.
But it's to long a story to go into in this forum and I like my
employment
Also have a look at baker and milk drivers going through red light
arrows on their rounds

Probably, but it's nice to teach tin tops a lesson about trucks using
2 lanes to make turns when they try and come in underneath you.
Or when they put on an indicator and think it gives them right of way
etc.
The list is long and has been done to death in forums like this.

Lets face it we are preaching to the converted in newsgroups like
this.

It's also payback for stuff they do to me when I'm on the bike

 

Yeah but how do you know how far 1km is? Wouldn't happen to be the same
inaccurate speedo/odo would it?

 

They can be noticeably different in size even within the same brand and
size rating. The Pilot Sports on the TRX in 120/60/17 were noticeably
smaller to the eye to the same size tyre in Macadam - both are Michelin.
Had two TRXs parked outside Northside (mine and one they had for sale),
I did a double take when I picked the bike up if it wasn't that you
can't buy a lower profile than 60 I would have though Michelin had
mislabelled the Pilot.

JL

 

Yah, tyres are another reason... they can make a few % difference even

but, what if you don 't oil your front sprocket?

 

Well, I thought so, but apparently I thought wrong.

Anyway - I wanna know what makes people so sure that the GPS is
accurate, seeing as how they take a reading every one second and each
point can be out by +/- 5 metres. Surely, going around a corner (ie: not
a straight line) the GPS would have a high probability of reading a
smaller distance than that traveled - and hence record a lower speed.

---
Cheers

PeterC [aka MildThing]
'81 Suzuki GS450-s (gone on to better and brighter things - I hope)
'87 BMW K100RT (write-off)
'81 Yamaha Virago (XV) 750H (work in progress)
'01 Yamaha FJR1300

www.dmcsc.org.au
http://eladesom.com.au/ulysses/
# 37181

 

That will screw up the jetting in your carbies.

GB