Speedo reading accuracy

**Hillbilly** · 13-01-2013, 06:38 PM

Originally Posted by brad

For me, this is akin to those people that set there watch 5 minutes fast so they aren't late for appointments.

If you know your speedo is accurate, you tend not to speed (that's how it works for me). I can't nelieve the amount of times the fast lane is held up by somebody in a VAG group vehicle who is religously sticking to the speed limit (good on them) but their speedo is deceiving them.

The answer to this is that you are probably speeding according to your speedo as almost all cars speedos are manufactured to the same tolerances as a VW.
One exception was my Landcruiser which according to my GPS was dead on at 100kph

**Hillbilly** · 13-01-2013, 06:43 PM

Originally Posted by Lemonskin

So hearing that the speedo is linked to the size of the wheels, if I was to get bigger wheels, that would stuff the speedo up would it not? Or is there a setting somewhere to specify your wheels size?

Read my reply re tyres You can put any WHEELS (RIMS) you like on as long as the overall tyre diameter doesnt exceed the largest original by more than 15mm or 26mm smaller

You can put bigger diameter rims but then need rubber bands instead of tyres

**brad** · 13-01-2013, 07:06 PM

Originally Posted by Hillbilly

The answer to this is that you are probably speeding according to your speedo as almost all cars speedos are manufactured to the same tolerances as a VW.
One exception was my Landcruiser which according to my GPS was dead on at 100kph

I think earlier that I rattled off an extensive list of the recently manufactured vehicles that we've had live in our garage the last 10 years - none as bad as my VAG product. If I throw into the mix all the pool cars at work, still none as bad as current VAG product. Most are about 3-5kph out at 100kph. My VAG is 8kph. That last 3kph is pretty annoying

**brad** · 13-01-2013, 07:08 PM

Originally Posted by AC74

Haha! Subarus are just as bad - my MY07 Outback consistently over-reads by ~10% (i.e. speedo says 100, buy you're actually doing 90). So next time you're stuck behind a seemingly dozy Forester, Outback or Liberty remember that!

We have an MY12 Outback. It's pretty good. I'm happy with the speedo.