Heads-up display?

[Mysticality]

AFAIK the legislation is the that speedo must read within +/-5% for cars newer than about 5 years old. It used to be +/-10% but they tightened things up 5 or so years ago.

I don't know exacts, I've never bothered to calculate it, so it is probably 5%.
And the speedo reads fast, not slow!!

[BluChris]

I think you're using the opposite expression to say the same thing... Anyway, I believe the legislation now requires that speedos not read lower than actual speed, but can read above actual speed. No more +\-

[wai]

The OBD speed readout is by the wheels, and 100% accurate... So your trip metre reads 100%.
Speedo reading is like 7-8% out for legalities.

Are you sure? What about the digital speed readout on the MFD? Mine tracks the analogue speedo exactly and both are around 5% out.

With the analogue speedo, how does it operate? Does it get a series of pulses to get the needle to move and hold?

The only other thing then is if the OBD displays the readout before it goes to the MFD, but this is also going to be a little out.

Of all the devices, a GPS speed indication is going to be far more accurate.

[wai]

AFAIK the legislation is the that speedo must read within +/-5% for cars newer than about 5 years old. It used to be +/-10% but they tightened things up 5 or so years ago.

The ADR has a formula with a % value and a + fixed limit. That is the speedometer cannot read below the true speed. It must read the exact speed or higher (i.e. on the safe side as far as infringing is concerned).

Manufacturers always err on the side of the speedo reading slow so that there is no way anybody can sue them when they are driving at an indicated speed but still get pinged for speeding. I don't mind it makes two fifths of nothing difference to most peoples travel times and I already pay enough $140 fines to the state of Victoria for being 3 or 4km over the limit without the hassle of having to keep the needle exactly on the correct speed. 100 km at 95kph takes about 3 minutes longer to cover than 100 km at 100 kph and who travels at exactly the maximum speed without deviation that that distance anyway?

Yes, the Victorian tolerance is absurd. I wish the police would also stick to the other conditions of using a Laser/Radar unit. Funny how they latch on to one thing and forget all the others.

[zei20t]

the MFD is the same as the speedo

the ODB/ECU is the correct one. the polar FIS uses the ODB/ECU readout. ive been through speed cameras at the speed limit (as per ODB/ECU) and have not been booked

[DkN]

Are you sure? What about the digital speed readout on the MFD? Mine tracks the analogue speedo exactly and both are around 5% out.

With the analogue speedo, how does it operate? Does it get a series of pulses to get the needle to move and hold?

The only other thing then is if the OBD displays the readout before it goes to the MFD, but this is also going to be a little out.

Of all the devices, a GPS speed indication is going to be far more accurate.

If you haven't changed your wheel size the OBD reading should be just as accurate. The mathematics is simple enough, it's never been about not being able to get it right, it's about precaution. No need for that during OBD diagnostics, you only want the most accurate info. Any error due to tyre wear etc would be no more inaccurate than GPS positioning error.

Not sure about Golf 6, but on the Golf 5 you can get the OBD speed from the hidden climatronics menu, and this speed readout which is displayed in the climatronics temperature screen is spot on with the GPS. I suspect the MFD readout on Golf 6 is adjusted post-OBD so it matches your speedo.

[Martin]

Hit a snag with the 360 Infinte unit - the OBDII plug is not usable due to cable coming out sideways
There are a few ways around this - I'll put it aside for now and come back to it later

[zei20t]

the OBD port unclips from the panel. that might help you plug it in and test

[RogerMcDoger]

Any updates, interested to see how it works, and what fitting it was like? I see the thoughts of the HUD-e, which was a shame, I had my eye on one of these. Hoped the Infinity would be better. I really kind of like the idea of the speedo and rev count on the windscreen.

[dportaz]

What I would give for all info on a headsup display such as speed, revs, gear, nav directions, radio station, song name etc etc etc...