tyre pressures (again)

Discussion in 'Tech/Mech General' started by iceni, May 19, 2010.

  1. iceni

    iceni Read Only Funster

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    Hi
    When i picked up my 2009 autocruise startrial in Jan the tyres had 60psi front and 65 psi rear. However the sticker in the door jamb says they should be 70 front and 78 rear. I have put this in but the ride is much harder now.

    I am thinking that as the last owner probally didnt alter them from new and also that the ride seemed better when it had 60 + 65 in whether there is a problem with specifications of tyre pressures b converters. theres nothing in the autocruise book about what the pressure should be so what do you folks think. I have seem many post re his subject so its obviously a topic that has lots of opinions so i would be interested in what others found when trying to find this info ot and what you ended up doing.

    thanks
    Phill
     
  2. VMax666

    VMax666 Read Only Funster

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    If you have read the multitude of posts on this subject,you will find there is only one way.
    1- Weigh the van, front and rear axle and total weight loaded as you would be on a trip.
    2- Ring the tyre manufacturer with relevant figures. THEY will tell you the correct pressures, not Fred down the pub, not some tyre fitter and certainly not the base vehicle manufacturer. End Of. No discussion, no alternatives. Well that's my twopennworth anyway.:Smile: VMax
     
  3. movan

    movan Funster Life Member

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    Hi icini, you are lucky to find somewhere to put air in the tyres. I drove round yesterday and used about a gallon of fuel and STILL havn't found a garage that has an air pump that goes over 60....... Going away tomorrow and one tyre is really deflated ...... bit like me.:Wink:
     
  4. lebesset

    lebesset Read Only Funster

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    common problem now ...garages with pumps that won't give over 4 bar

    however all tyre dealers have proper compressors ...I've never been charged yet !
     
  5. vwalan

    vwalan Funster

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    sometimes the pressure set by the manufacturers is for a loaded van .it is not always ideal for comfort .play around 5-6 psi eiter side see what feels comfy. then monitor the tyre wear if the edges, wear up the psi, if the middle wears, lower the psi. trial and error but it works. cheers alan.
     
  6. pappajohn

    pappajohn Funster Life Member

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    my 3.85t kontiki runs at the same as yours.
    not too hard and not too soft.
    tyres never get hot, warm but not hot, no matter how long the run is.
     
  7. iceni

    iceni Read Only Funster

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    Hi Movan
    I have a HD compressor form costco that i keep in the vanIts the one the AA use and does 200 psi. Does my 80psi no problem/
    There are some lorry air compressors about if you look. Saves moving the van
    Phill
     
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