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Audi definition of "unladen weight"?

1.2K views 6 replies 5 participants last post by  Blade Runner  
#1 ·
Hi All

I was interested to compare the weights of a 5 door Golf R manual with an Audi TTS manual. Simple task, right? The unladen weights are quoted (by VW and Audi) as 1513 kg and 1365 kg respectively, but I then discovered that VW and Audi may quote "unladen weight" very differently!

VW use a recent EU definition that includes the driver (68kg), luggage (7kg) and the fuel tank 90% full (in a Golf this would be about 34 kg), but I have been unable to find for sure what Audi use. TT brochures seem to be silent on the issue, but I did manage find a brief reference in a recent A5/S5 brochure that said "Vehicle's unladen weight without driver (calculated in accordance with the current version of Directive (80/1268/EEC)". Err, an emissions Directive from 1980. Really? The trail then went cold!

I therefore suspect that the difference in weight between the current Golf R and the TTS is nothing like the 148 kg indicated by the brochure figures, and is probably closer to about 50kg? Can anyone throw any light on this?
 
#5 ·
LEO-RS said:
You're correct, Audi quote weight without the 75kg driver and luggage weight.

I am 99% sure that's the only difference though, fuel at the same 90%
I reckon so.

http://eur-lex.europa.eu/legal-content/ ... 68&from=en

6.1.1.2. For the purposes of this Directive, 'mass of the vehicle in running order' means its
total unladen mass with all tanks except the fuel tank full, the fuel tank being filled to
90 % of the capacity specified by the manufacturer, and with a set of tools and the
spare wheel on board.


Blade Runner said:
Many thanks. So the TTS is 73 Kg lighter than the 5 door Golf R..
This is what i'm seeing myself. 67=Driver 7=Luggage 30=Weight difference of 5 door vs 3 door (all double clutch gearbox variants)

TTS 1385 + 67 + 7 = 1459kg
Golf R 3 door 1505kg (+46kg over TTS)
Golf R 5 door 1505kg + 30kg = 1535kg (+76kg over TTS)

Sources:
http://www.volkswagen.co.uk/assets/comm ... ochure.pdf
https://www.audi.co.uk/content/dam/audi ... celist.pdf
 
#6 ·
I was wondering about the details of the weight equation: what's the rim and tyre size and design impact on the weight?
I was thinking to bring a scale next time when I go to the garage and check same size tire /different models / makes.
Did anyone already check this? What about the total mass difference between the 18''/19''/20''' rims factory equipment?
How does the rolling mass of the wheel and its "momentum" influence vehicle dynamics?
 
#7 ·
tt3600 said:
LEO-RS said:
You're correct, Audi quote weight without the 75kg driver and luggage weight.

I am 99% sure that's the only difference though, fuel at the same 90%
I reckon so.

http://eur-lex.europa.eu/legal-content/ ... 68&from=en

6.1.1.2. For the purposes of this Directive, 'mass of the vehicle in running order' means its
total unladen mass with all tanks except the fuel tank full, the fuel tank being filled to
90 % of the capacity specified by the manufacturer, and with a set of tools and the
spare wheel on board.


Blade Runner said:
Many thanks. So the TTS is 73 Kg lighter than the 5 door Golf R..
This is what i'm seeing myself. 67=Driver 7=Luggage 30=Weight difference of 5 door vs 3 door (all double clutch gearbox variants)

TTS 1385 + 67 + 7 = 1459kg
Golf R 3 door 1505kg (+46kg over TTS)
Golf R 5 door 1505kg + 30kg = 1535kg (+76kg over TTS)

Sources:
http://www.volkswagen.co.uk/assets/comm ... ochure.pdf
https://www.audi.co.uk/content/dam/audi ... celist.pdf
Nice work. I started out looking for "obvious" reasons why the TTS feels so much more nimble and sharper than the Golf R (especially in the lower gears), despite the fact that the engine and gear box are the same. Ok, the TT has a lower C of G but I thought that basic weight must also come into it? I think we have established that the weight difference between the two cars is not nearly as much as the raw 'brochure figures' would suggest, but its still significant (at around 75 kg). There are doubtless other minor differences that "somehow all add up", but they are more difficult to pin down. Just be happy with the final result, I guess :)

I remember reading somewhere that the Mk 3 TT is about 50kg lighter than the Mk2 and some journo's were attributing the better handling to that, at least in part, and it also seems to have worked for the FL RS3. Top Gear logic: lighter = better. Actually, basic physics, but that's not so contentious..