Speedometer readings

[alexmk6gti]

I've found the dead reckoning using the RNS510 is accurate
analog = 109
digital = 106
rns510 dead reckoning = 100 kmph

[Mutley251]

Another way of checking is sit on the freeway. Set your cruise control, reset your computer so the average speed resets. Keep a constant speed and there you will have the difference. The average speed will be the true speed.

So as it goes for most 100 real is 106 / 107 displayed.

[oileoi]

What sort of car are you getting and what sort of tyres will it come with?

I'll be getting a 90 TSI but I'm not entirely sure about the specs of the tires that it comes with. I called Barloworld and the sales person couldn't tell me either. The only thing they told me was that it could come with Continental tires or Michellin but they didn't tell me the specs. That really didn't help me at all.

I had a look at the specs PDF on the VW website and I couldn't find the specs for tires that comes with the (Wellington) 15 x 6½” Wheels either, I'm guessing they will be 195/65R15 tires.

I used the tire calculator (thanks logger) and got the following results:

Differences between Wheel/Tyre 1 ( 195/65R15 ) & 2 ( 225/40R18 )
Rolling Radius 1.35mm
Circumference 8.48mm
Diameter 2.7mm
When your speedo reads 100km/hr you're actually at 100.42 km/hr

So basically minimal difference, however I will be using a 8.5 x 18" rims so my tires would be stretch a little but not much at all so I guess the speedo reading should be fairly accurate?

[Swallowtail]

Will 8.5s fit under the guards?? I didn't think they would without extensions...

[oileoi]

Will 8.5s fit under the guards?? I didn't think they would without extensions...

Yes they will without any problems!

[Swallowtail]

Yes they will without any problems!

Cool! That will look good.

[logger]

I'll be getting a 90 TSI but I'm not entirely sure about the specs of the tires that it comes with. I called Barloworld and the sales person couldn't tell me either.

Just stumbled on this which shows the VW approved tyres for your car. should be if use I reckon:

Golf 2009/10

1.4l 90 kW petrol engine_______offset___chains
Standard tyres 195/65 R 15 91H_______47___yes
Modification 195/65 R 15 91V_______47___yes
Modification 195/65 R 15 91H/V_______50___yes
Modification 205/60 R 15 91H/V_______47___yes
Modification 205/55 R 16 91H/V/W_______50___No
Modification 225/45 R 17 91H/V/W_______54___No
Modification 225/45 R 17 91H/V/W*_______51___No
Modification 225/40 R 18 92Y**_______51___No


* 225/45 R 17 91H/V/W tyres on 71/2 J x 17 wheels with offset 51 are only possible in combination with sports running gear!
** 225/40 R 18 92Y tyres on 71/2 J x 18 wheels with offset 51 is permitted only on vehicles with sports running gear and rear axle camber of -1°45' !

Note the comment about rear axle camber of -1°45'.

[oileoi]

Just stumbled on this which shows the VW approved tyres for your car. should be if use I reckon:

Golf 2009/10

1.4l 90 kW petrol engine_______offset___chains
Standard tyres 195/65 R 15 91H_______47___yes
Modification 225/40 R 18 92Y**_______51___No



** 225/40 R 18 92Y tyres on 71/2 J x 18 wheels with offset 51 is permitted only on vehicles with sports running gear and rear axle camber of -1°45' !

Note the comment about rear axle camber of -1°45'.

Thanks for this logger but I'm not entirely sure what they meant. Where did you get this information from mate?

The tires I got for my car are Khumo U31 SPT 225/40 R 18 92Y but the offset of my wheels is ET 45. Before I bought my wheels I check with the guys at VRM wheels and they told me this fitment should be perfect for my car ???

So it looks like they are not suitable for my car after all? (i'll be very piss off if they are not)

[pologti18t]

Thanks for this logger but I'm not entirely sure what they meant. Where did you get this information from mate?

The tires I got for my car are Khumo U31 SPT 225/40 R 18 92Y but the offset of my wheels is ET 45. Before I bought my wheels I check with the guys at VRM wheels and they told me this fitment should be perfect for my car ???

So it looks like they are not suitable for my car after all? (i'll be very piss off if they are not)

The offset of your wheels will depend on their width (in inches)

[number 2]

Anyone know what the two red lines on the 30 and 50 kph mark on the MkV is all about?

[Corey_R]

Important speed zones in the UK or Europe?

[bmck]

...and on a slightly related topic, what about the caption on the tacho?

"1/min"

1 what per minute? Rev, Elephant, Banana?

Why not "Rev/min"?

[MIRSAD]

Important speed zones in the UK or Europe?

... it is correct at least for Germany, Austria & se-rounding countries.