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Author Topic: Weird WLTP emission results - bigger wheels = lower Co2!  (Read 2711 times)

Offline kmpowell

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Weird WLTP emission results - bigger wheels = lower Co2!
« on: 22 January 2019, 16:34 »
I've been trying to figure out why the VW website says the 245 Performance is 143g/km when mine is rated 140g/km. I put it down to an error on the VW website which they had yet to update. Then today I noticed VW have updated the Golf pricelist with full WLTP figures.

First for context and comparison, here's the pre WLTP numbers on MY18:

MY18 245 Performance DSG
- on 18" Parkers: 144g/km
- on 18" Sevilles: 148g/km
- on 19" Brescia: 148g/km
- on 19" Santiago: 148g/km

And now here's the new WLTP rated numbers...

MY19 245 Performance DSG
- on 18" Parkers: 143g/km
- on 18" Sevilles: 143g/km
- on 19" Brescia: 140g/km
- on 19" Santiago: 140g/km

Yup, that's right, WLTP approved cars on bigger wheels have a lower Co2 emission level!  :shocked:

Not that i'm complaining, but how on earth are they coming to that conclusion given how they were previously?!?  :laugh:
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Offline fredgroves

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #1 on: 22 January 2019, 17:30 »
Yeah I commented on this in the WLTP orders delayed thread... I don't understand why it happened like that though! Especially given that WLTP is supposed to be even more real world and bigger wheels are less efficient...
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Offline Will2018

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #2 on: 22 January 2019, 18:06 »
The 18's are Bridgestones and the 19's Pirelli. It could be that the Pirellis have a much better rolling resistance. That's assuming the new figures are based on actual driving data.
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Offline dubber36

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #3 on: 22 January 2019, 18:44 »
Higher 'recommended' pressures to get through the test?
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Offline Will2018

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #4 on: 22 January 2019, 18:52 »
Quote from: dubber36 on 22 January 2019, 18:44
Higher 'recommended' pressures to get through the test?

Not a bad shout, my June 2018 GTi on 19s says 42 psi all round which seems really high. I believe this is a good few PSI higher than pre facelift cars.
« Last Edit: 22 January 2019, 19:21 by Will2018 »
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Offline fredgroves

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #5 on: 22 January 2019, 18:59 »
Over inflation to reduce footprint? That would do it... Will bugger the tyres real quick though
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Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline kmpowell

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #6 on: 22 January 2019, 19:05 »
Quote from: dubber36 on 22 January 2019, 18:44
Higher 'recommended' pressures to get through the test?
That's a good shout!

Hmmm, could someday take a pic of the tyre pressure sticker from their pre WLTP 7.5?
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SOLD March 2021
2019 GTI Performance, 5DR, DSG - Isaac Blue, Leather, Pan Roof, 19" Brescias, DCC, Dynaudio, Rear Camera, Keyless, Electric Memory Driver Seat.

Offline Brenbo

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #7 on: 22 January 2019, 19:28 »
I can confirm the tyre pressure for the 19" Pretorias on my MK7 Golf R is supposed to be 36psi all round.  I know this as I just checked the pressures two days ago and this is whats on the sticker. 
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Offline mcmaddy

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #8 on: 22 January 2019, 23:08 »
36 all round on my mk7 pp too. A friend has just got his new GTi pp and the pressures are 38 on the sticker 🤷‍♂️
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Offline Splashalot

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Re: Weird WLTP emission results - bigger wheels = lower Co2!
« Reply #9 on: 23 January 2019, 00:35 »
165/35/19?   :wink:
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