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Help please

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by mor48, Oct 29, 2012.

  1. mor48
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    mor48 New Member

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    Hi All,

    I'm hoping for some advice. On Wednesday morning i'm going to look at a 2.5TDI Allroad, 2005 with 45,000 miles and the automatic gearbox.

    It has full service history and seems in good overall cosmetic condition.

    I would hugely appreciate advice on what to look out for beofre buying it.

    I've done a little research and am lead to believe potential areas of concern are the air suspension and the gearbox, so in particular any tell tale things to look out for on these would be fantastic.

    Many thanks!
    #1
  2. mor48
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    mor48 New Member

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    Also it has 225/55/R17 wheels and I would want to put Hankook Optimo 4S tyres on it. They don't come in that size though, nearest is 225/60/17" would these be ok to fit.

    Thanks.
    #2
  3. TYphoon GB
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    TYphoon GB Member

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    Cambelt and water pump replaced?
    Gearbox oil serviced?
    State of front control arms?
    State of Cv Boots?
    Rust round inside of arches?
    Undercovers in place?
    Vag Com code scan for any faults?

    60 profile tyres will upset the speedo calibration slightly not ideal on an auto and also your insurance company if they ever have to notice them...
    #3
  4. mor48
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    mor48 New Member

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    Thanks for the info, I understand the speedo thing but why would 60 profile be more of an issue on an auto?
    #4
  5. TYphoon GB
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    TYphoon GB Member

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    The gear box mechatronic takes inputs and feeds several systems such as the ABS and Traction. It expects inputs that match e.g engine speed, road speed, ABS etc unlike a manual that just does what you tell it.

    Whilst the ratio difference is slight its software and may make the 'wrong' judgement as to what gear and when or that reading means I should activate stability control or just throw a 'I dont understand' code error.

    You insurance company may be interested as (apart from looking for any excuse not to pay up) it 'could' affect the ABS and traction in an 'emergency' and would class as 'modified' from the manufacturers specification.

    Some of the latest VAG's cars for example have winter tyre settings so the software can better cope with conditions against expected behaviour.

    In reality it may make little difference as the A6 C5 had a range of tyre sizes, profiles and rims through its life. Speed and load ratings are of course the real issues.
    #5
  6. TYphoon GB
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    TYphoon GB Member

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    [TABLE="class: clear, width: 408"]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD][/TD]
    [TD]55[/TD]
    [TD]60[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Diameter
    [/TD]
    [TD]679.3mm[/TD]
    [TD]701.8mm[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Circumference[/TD]
    [TD]2134.1mm[/TD]
    [TD]2204.8mm[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Speedo error[/TD]
    [TD]0%[/TD]
    [TD]-3.21%[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Reading at 30mph[/TD]
    [TD]30mph[/TD]
    [TD]29.04mph[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Reading at 60mph[/TD]
    [TD]60mph[/TD]
    [TD]58.08mph[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Ride height gain[/TD]
    [TD]0mm[/TD]
    [TD]11.25mm[/TD]
    [/TR]
    [TR="class: mainfont"]
    [TD][/TD]
    [TD]Arch gap loss[/TD]
    [TD]0mm[/TD]
    [TD]11.25mm[/TD]
    [/TR]
    [/TABLE]

    So thats technically over the 10% allowed in law for speedo error.
    #6
  7. deanosabby
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    deanosabby Member

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    Tire Size Comparison

    Specification 225/55-17 225/60-17
    Sidewall 4.9in 5.3in
    Radius 13.4in 13.8in
    Diameter 26.7in 27.6in
    Circumference 84.0in 86.8in
    Revs/Mile 754 730
    Difference 0.0% 3.3%

    Back to the Calculator
    Copyright 1996-2001, Eunos Communications LLC



    That will be fine as the difference is only 3.3%, but one thing to bear in mind is that even with the right size of tyre I doubt your speedo will be bang on.

    Attached Files:

    Last edited: Nov 18, 2012
    #7

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