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Tyre pressures

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Brown Dog, Oct 12, 2019.

  1. Brown Dog

    Brown Dog New Member

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    So I've had my first and last service at a dealer, and whilst they seemed ok, didn't rotate tyres despite stating they did, i noticed the tyres had way more pressure.
    They have put 42 PSI into them.

    Is this normal, ideal, and what do people generally do for a daily ?

    Thx in advance :)
     
  2. Forg

    Forg Well-Known Member

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    I usually run 40, 42’s higher than I aim for but doubt I’d feel the difference. :)
     
  3. Paul Cordingley

    Paul Cordingley Member

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    I use the recommended 36psi (as per the driver’s door well) and got over 50K out of my original Potenzas. I reckon I could have gotten another 10K out of them but I was being too conservative. I aim to get 60K out of my current second set. Anything much more than 36psi and it’s a bit too harsh for me.
     
  4. kleanphil

    kleanphil Active Member

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    Doesn't pressure depend on rim diameter , I have 20" so I think 40 - 42 is right but for 18 - 19" might be 34 - 38 , width and profile would make a difference also wouldn't it ?
     
    Last edited: Oct 13, 2019
  5. Z31na

    Z31na Member

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    39-39 for “eco” and 39-44 fully loaded on the factory 17 inch rims
     
  6. The1

    The1 A Memcal a Day Keeps..

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    if you want a comfort ride use the manufacturer specs, if you want best handling and fuel economy i usually pump them to 5psi from the wall specs when cold.
     
  7. [paradox]

    [paradox] Active Member

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    more so sidewall height
    but generally speaking if you double the rim diameter as psi, you are probably in the ballpark

    im another one running 40psi on 20s
     
  8. Milo 6.0

    Milo 6.0 Member

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    36 psi on the factory 19s,dont forget the pressure rises when hot at least 1-2 psi unless you run nitrogen.
     
  9. stooge

    stooge Well-Known Member

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    the whole nitrogen thing is a scam to get people to pay money for essentially air.
    the air we breathe or put into out tyres is about 78% nitrogen and removing that last 20% or so will not have much benefit at all apart from the "magic bat" theory where say a baseball player has a "magic bat" he believes he can hit better, in this case it is nitrogen filled tyres can make someone drive better or get better kms/performance out of the tyre.

    you will find all sorts of marketing hype about inflating tyres with nitrogen but in the real world it is all rubbish and does not have any real effect for passenger vehicles.
     
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  10. Skylarking

    Skylarking Well-Known Member

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    ^ Yep, with some people it’s easy to sell ‘snake oil’ like product and make a few bob in the process. Lots of such products on yen market.

    As for nitrogen tyre fill, I’ve had it offered to me by the up-seller at the tyre shop. I replied “seriously, air is already 78% nitrogen” and his shoulders visibly sunk just that little bit. Needless to say the up-sell attempt was over :rolleyes:

    As for “any real effect for passenger vehicles”, I’d go further and say it has little to no effect in most racing situations. And I’d suspect any nitrogen used in racing is a marketing attempt from the tyre suppliers to convince us that their “product” has merit.

    [edited to add]
    About the only real benefit of using nitrogen is that it contains no moisture and overcomes some perceived pressure change issues in humid locations. Such issues can be resolved by properly maintained compressors and dryers that removes any moisture from the compressed air. But seriously, many non enthusiast car people (the ones who race on tracks) would not be able to tell the difference in the handling of their road vehicle between 30psi and 40psi in their tyres; nitrogen or not o_O
     
    Last edited: Oct 13, 2019
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  11. Skylarking

    Skylarking Well-Known Member

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    Yeah,I know lots here don’t like John Cadogen but could be worth a listen on the myths of nitrogen in car tyres ;)

     
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  12. Brown Dog

    Brown Dog New Member

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    yeah i have 19s so maybe i'll play around at 38 ish...
     
  13. wetwork65

    wetwork65 A wet business

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    Brown, I find 38 psi (cold tyre) works perfectly on my 19 inch rims. Mind you 38 works perfectly on my other car with 18 inch rims.
    I just prefer 38 because its a nice number. And I trust petrol station air regulators are set properly (actually I check with my digital gauge).
     
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  14. wetwork65

    wetwork65 A wet business

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    Agree Skylarking, the best feature is the dryness of the gas. I guess the providers will use Nitrogen from bottles which is the result of rigorous processing, rather than just drawing air from the back of the servo compressor.
    I check my tyre pressures on dry days, but having worked in many industrial settings, I know there is potentially a lot of water in air lines, even when filtered and dryers fitted.
    Really hate to agree with John Codagon and I can't bring myself to listen to his spiel, but assume he is not in favour of N2 for tyres.
    Oh, and this link was one of the last times there was a group discussion on this topic, back in the good ole days of 2018, when Monsta was part of the family https://forums.justcommodores.com.au/threads/costco-tyres-revisited.271166/page-2
     
  15. stooge

    stooge Well-Known Member

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    The pro's and con's of nitrogen for tyres
    a non-john summary lol

    i think we can all agree that the real benefit for nitrogen in the tyres of passenger vehicles is for the tyre shop to make a bit more profit.
     
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  16. Forg

    Forg Well-Known Member

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    ... or a marketing advantage.
    Someone told me one of the cheap chains fills with nitrogen as part of the price; might have been Costco?
     
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  17. wetwork65

    wetwork65 A wet business

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    It's like filling tyres with Hydrogen to make them lighter.
    The chemical reactions with would be mind-boggling.
     
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  18. Milo 6.0

    Milo 6.0 Member

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    Bahahaha did I mention nitrogen,sounds like another dyno hp argument type thread lol.
    Ill stay out of that one.
    Im happy with normal old compressed air.
     
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  19. Poor old Dad

    Poor old Dad Active Member

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    Yep, Costco do as part of the deal - no extra cost and they will also check/top as required (I get mine checked before our road trips).

    Never worried about it prior to buying tyres at Costco and wouldn't bother if it was an added cost or inconvenient but as it's neither, I do it.

    In another life I serviced air compressors for a living. It may be different now but back in the day, other than in emergency, there's no way I'd go near a servo for tyre inflation.
     
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  20. 1985VK

    1985VK Well-Known Member

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    I fill my tyres with approximately 79% nitrogen and 21% oxygen
     
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