Reply With QuoteYou may find that the speedo is out by more than 4%. In each VW I've owned (MK4 Polo GTI and MKV Golf GTI), when the speedo is reading 100, the car is actually doing 93. So that's 7% out. It is exactly 7% out at any speed.
New Dubber
Yep agree with both posts, will check whether distance travelled is more accurate than indicated speed.
I always found that Toyotas were spot on with speed. I have owned two corollas and a vienta and found that unlike the most Europeans they indicated speed pretty accurately.
cheers
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VWwA Super Moderator
You may find that the speedo is out by more than 4%. In each VW I've owned (MK4 Polo GTI and MKV Golf GTI), when the speedo is reading 100, the car is actually doing 93. So that's 7% out. It is exactly 7% out at any speed.
Volkswagen Fan
Exactly our experience in the Golf too. Quick calc of 118 at 110 is 7%Originally Posted by coreying
Must be pretty common over a wide range of makes as sitting on 118 indicated you tend to catch and pass a lot of good citizens driving at their 110 indicated speeds.
Only seem to be passed frequently by red p platers at this speed.
Last edited by Highlander; 15-07-2010 at 12:21 AM.
You know you are getting old when you cancel your order for a 3.6 CC and buy an Icelandic Gray TDI CC instead.
Volkswagen Fan
My 118TSI and my friends's 103TDI are both out by exactly 5% compared to a GPS, at every speed I've tested at. My previous car's speedo was pretty much spot on, which led to overtaking a lot of people when you were travelling at the speed limit, so I guess speedos that overread a little must be very common.
Golf 118 TSI DSG, white with sports pack.
Ultimate Dubber
I'm set to recieve a second blocked DPF off a MKV GT TDI, so I'll weight it before I start surgery on it. No way it's 10+kgs different though!
2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |
Volkswagenist
They can't do this anymore. UNECE 39/00 (rev 1) which is used in most countries including Australia (ADR 18/03) does not allow the speedo to be accurate.
Volkswagen Speedometer Error Correction
website: www.my-gti.com
Volkswagen Fan
My V6 Passt is the same. 7% difference between GPS and Speedo...then you put cruise on and the speedo says its 2% faster than the speed that the CC is set at.
Last edited by V6Passat; 15-07-2010 at 04:48 PM. Reason: typo
V6Passat
Here now!
Volkswagen Fan
I borrowed a mates analyser to plug into the OBDII port and it was interesting to see that the cars speed as reported over the CAN bus was spot on with the GPS but the digital display was 6% optimistic and the analogue speedo was 7% optimistic. The car knows the correct speed as it should with oem tyres but as Maverick points out with his references they need to provide some margin on what is shown to the driver to cover different tyre fitments, etc. They would be in a lot of trouble if the speedo under read. The 6% however seems excessive given Holden can achieve 2% with their locally produced cars.
Super Moderator
VWwA Super Moderator
It's obvious that the car knows exactly what speed that it's doing, but that VW have chosen to put the 7% over-read in there.
I think that maybe there are some more specific rules in the EU or something, because several other Euro brand cars I've been in are also 7% or very close to...
Volkswagen Fan
So without Sat nav, are the speed check radars used in Vic on Hume H'Way accurate? Eg, use to calculate
an offset for when setting cruise control? (With commodore around 4K diff at 110KPH, Corolla spot on)
MY13 Passat 130TDI Sedan. Autumn Brown Metalic, Desert Beige seats. Sat nav, Rev camera, Dynaudio, 12way adj seats. No ACC Previous Golf 118 TSI with ACC given to my son
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