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Discussion in 'A4/S4 forum(B5 Chassis)' started by Gunny110, Dec 7, 2013.

  1. Gunny110
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    Gunny110 Member

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    [Dec 7, 2013]
    ImageUploadedByTapatalk1386436953.601893.jpg I can't believe that the computer on a 15 year old derv would count up this far lol. I used to run my tires at 35psi. I am now running them at 45 and have recently fitted a pro race chip. I used to get 49-51mpg with my driving style, and I'm now getting between 58-62 I can't believe it!!!! Good derv :D
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  3. Gunny110
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    Gunny110 Member

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    [Dec 7, 2013]
    ImageUploadedByTapatalk1386437247.551448.jpg
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  4. JimmyH
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    JimmyH Member

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    [Dec 7, 2013]
    The DIS computers aren't that accurate, they are to be taken with a pinch of salt!

    45psi!!! prepare to be changing tyres more often.
    #3
  5. a6_chris
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    a6_chris Well-Known Member

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    [Dec 7, 2013]
    Do a brim to brim fillup and calculate it manually ;)
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  6. Gunny110
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    Gunny110 Member

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    [Dec 7, 2013]
    Thanks Chris, I think that is the best way of doing it tbh. Is that right jimmy, as Shirley because thee is less tire on the surface of the road there is less friction, meaning less wear? Hence the better mpg I'm getting
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  7. JimmyH
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    JimmyH Member

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    [Dec 7, 2013]
    yes your theory is correct, what your not realising is, with the increase in pressure the tyre has less surface footprint this will cause the tyre to wear in the centre quickly as the load/wear is not being shared and distributed evenly across the tyre.

    The handling will also be affected, skittish and unpredictable.
    #6
  8. DieselJake
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    DieselJake God Mode

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    [Dec 8, 2013]
    Overinflation > Underinflation; especially for wear, economy and handling.
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  9. spartacus 68
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    spartacus 68 Active Member

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    [Dec 8, 2013]
    Yes, but less tyre contact has it's down side especially when you need to brake. Taking corners on a frosty morning won't be a good idea either as there's no flexibility in the tyre at 45psi, bit like a train on rails.
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  10. Gunny110
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    Gunny110 Member

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    [Dec 8, 2013]
    Lol, that is very true, but I spend most of my time on motor ways (tidworth to Cornwall) most weekends, so my mpg are very important to me. I normally run them at 35psi, what would be a good standard 40?
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  11. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Dec 8, 2013]
    I run mine a 2.5 bar allround !!
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  12. Gunny110
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    Gunny110 Member

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    [Dec 8, 2013]
    What's that bradderz
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  13. Mr K
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    Mr K Member

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    [Dec 8, 2013]
    I am the same pretty much, 37psi is what I've had mine at. Can't remember what it says inside the filler cap. But mid 30s gives the carcass enough rigidity without being too hard.

    you need to run the 225 45 17s harder than the 205 55 16s (?) according to audi.
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  14. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Dec 8, 2013]
    as above around 36-37psi !!
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  15. Gunny110
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    Gunny110 Member

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    [Dec 8, 2013]
    Ok, il get that sorted then, it feels ok on the motorway tho, but I suppose for city driving corners ect, it is abit much
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  16. ScottD3
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    ScottD3 I want your faulty electronics

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    [Dec 9, 2013]
    I've always ran my tyres at 40psi with out any issues that I'm aware of.

    Lucky man for getting that MPG.

    My calculated MPG is 36mpg at the moment. :(
    #15
  17. Gunny110
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    Gunny110 Member

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    [Dec 9, 2013]
    Thanks Scotty, for milage that I do, I don't think 45 is bad, and I don't plan on plowing through a corner at 60 mph, she's a diesel!! Lol. Trust me Scotty, I was just as surprised as you
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  18. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Dec 9, 2013]
    TQS's are heavier, and thus have hihger pressure as standard, so not directly comparable to a tdi FWD...

    From memory, my old 1.8T FWD said 32psi all round, TQS saloon is 36F/34R and the TQS avant is 36 all round.

    Look on your fuel flap and it'll give you two pressures, one for normal running and one for fully loaded. Running the fully loaded pressure all the time is probably about as high as you want to go without causing abnormal wear and effecting the handling too much.
    #17
  19. ScottD3
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    ScottD3 I want your faulty electronics

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    [Dec 9, 2013]
    I've ran 40psi for the last 2 years, 6 tyres and 30k miles with no issues.

    No idea on handling though. :)
    #18

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