GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: kmpowell on 22 January 2019, 16:34
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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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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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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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Higher 'recommended' pressures to get through the test?
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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.
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Over inflation to reduce footprint? That would do it... Will bugger the tyres real quick though
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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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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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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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165/35/19? :wink:
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Surely VW wouldn't try and fiddle the test results...............again :whistle:
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Surely VW wouldn't try and fiddle the test results...............again :whistle:
Everyone in everything games the rules.
Tax avoidance
F1
GDPR
The rules are there, you can do anything not prohibited by the rules.
The out and out cheating with the "test detection" was not fair game, everything else is.
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It seems there might be an element of truth to all this.
Here's the sticker on my car:
(https://i.postimg.cc/RCLnC7sf/IMG-2006.jpg) (https://postimg.cc/xqqdtzST)
41psi all round for a normal load... :huh:
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Don't be surprised if:
1) when you replace your tyres you find that the centre has worn much more than the outside, possibly even getting your tyre fitter to tell you that your tyres are over inflated
2) That you actually have less grip - not having the full width of the tyre in contact with the road will do that... especially in the wet or snow...
I'd doubt if VW have changed the tyres to give a different recommended pressure, these are the same tyres as fitted right from the start of the Mk7.
I'm fairly sure its been inching up already - that my 2014 GTD ran at 33 and the 2017 GTD I have now (same tyres, same car effectively) is 36...
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2) That you actually have less grip - not having the full width of the tyre in contact with the road will do that... especially in the wet or snow...
I'm going to be totally honest here. I've been very surprised at how easily the front wheels have been spinning up in these damp/cold conditions. I've owned powerful cars (various TVR, M, RS products etc), so I like to think I'm fairly versed at how to get the power down on FWD/RWD/AWD cars, each needing their own driving style, but i've been surprised at how easy the Golf has been losing traction.
Back in 2010 I owned a R56 Factory John Cooper Works Mini, and that never struggled like the Golf does.
I'm going to take a few PSI out of my tyres to see how that effects things.
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It could be pressures, worth a try.
On the other hand, the OEM tyres VW use on the Mk7 performance models are notoriously bad.... probably give excellent CO2 figures but not suited to cold UK winters. Might be OK in Germany, because you don't run summer tyres in the winter...(by law)
Swapping to PS4's makes a hell of a difference.
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Pressures for 19s hasn't changed since my 2015 car:
(https://i.postimg.cc/PrsvShQF/20180929-112531.jpg) (https://postimg.cc/pyCddw7D)
and I've not had any uneven wear or grip issues. It does appear to have gone up a bit for 18s though.