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Tyre Pressures

TheTaipan

By TheTaipan
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TheTaipan

TheTaipan

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I have always been one to ignore the tyre placards on the door of my car and

keep the tyre pressures >40... but my brother chose follow the advice made

by the car manufacturer.

He recently took his BA XR6 in for its service, later the technician rings

and says his tyre sidewalls are cracking - he needs four new tyres - would

he like them to sell him a new set of dunlops? Perplexed, he asks, why

would they have split? The technician replied that the tyre pressures were

too low and that meant the walls were too soft and the tyres have

deteriorated. To which my brother replied, but my pressures are always

thirty, knowing that he checks them regularly, what are they now?

Technicians answer was thirty... my brother asks what is written on the door

of the car, and the answer - thirty comes back. .The obvious next question

was asked - so what should he run them at? >40...

At the end of the day the tyres ended up being replaced under warranty, but

surely they must be getting away with that one an awful lot by the sounds of

things?!? Still at $480 per hoop - for a whole set of four that would have

cost him a sh*tload had he not known EXACTLY what pressures he was running

on and what was written on the door...

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ms700

ms700

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There is a TSB out on the Dunlop SP3000 tyres, any dealer who doesn't know this by now really needs to have new arseholes torn for them. Tell them to have a look at the fordworkshop website, if they know what that is......

We have replaced almost 50 SP3000's, all warranty, no questions asked. All happy customers too!

:blink:

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TheTaipan

TheTaipan

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There is a TSB out on the Dunlop SP3000 tyres, any dealer who doesn't know this by now really needs to have new arseholes torn for them. Tell them to have a look at the fordworkshop website, if they know what that is......

We have replaced almost 50 SP3000's, all warranty, no questions asked. All happy customers too!

:blink:

<{POST_SNAPBACK}>

TSB?? What does that mean/how does it relate?

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ms700

ms700

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There is a TSB out on the Dunlop SP3000 tyres, any dealer who doesn't know this by now really needs to have new arseholes torn for them. Tell them to have a look at the fordworkshop website, if they know what that is......

We have replaced almost 50 SP3000's, all warranty, no questions asked. All happy customers too!

:blink:

<{POST_SNAPBACK}>

TSB?? What does that mean/how does it relate?

<{POST_SNAPBACK}>

TSB = Technical Service Bulletin.

Dunlop have realised that there is a problem with the sidewalls on the SP3000's, and they are prone to cracking. All SP3000 tyres that suffer cracked sidewalls wil be replaced by Ford at no cost to the owner.

The pressure being run in the tyre doesn't have much to do with the problem. The tyres would have cracked, regardless if you ran 30 or 40 PSI.

Hope this clears it up! :blush:

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Turbo6man

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There is a TSB out on the Dunlop SP3000 tyres, any dealer who doesn't know this by now really needs to have new arseholes torn for them. Tell them to have a look at the fordworkshop website, if they know what that is......

We have replaced almost 50 SP3000's, all warranty, no questions asked. All happy customers too!

:nono:

<{POST_SNAPBACK}>

TSB?? What does that mean/how does it relate?

<{POST_SNAPBACK}>

TSB = Technical Service Bulletin.

Dunlop have realised that there is a problem with the sidewalls on the SP3000's, and they are prone to cracking. All SP3000 tyres that suffer cracked sidewalls wil be replaced by Ford at no cost to the owner.

The pressure being run in the tyre doesn't have much to do with the problem. The tyres would have cracked, regardless if you ran 30 or 40 PSI.

Hope this clears it up! :nono:

<{POST_SNAPBACK}>

Some dealers will try anything eh? Like the one who charged over $400 for a 30k service!!

I would expect that running 40 psi would help the tyre to last quite a bit longer before the sidewalls collapsed because heat is one of the major contributing factors with this problem.

It's possible that at 40 psi the tyre could actually last it's normal wear life without any problems arising. Of course I'm not suggesting this could happen on Ivan's car for instance, but for Ken maybe ... :spoton::crybaby:

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Lawsy

Lawsy

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Remember, when a tyre gets to its running temperature that you get anywhere between 2 - 5 psi increase in pressure, so you have to be carefull....

I would stick with the manufacturers pressures, sometimes less, sometimes a little more. They aren't completely dense you know, they test each tyre on a load, speed and pressure scale to find out what would work the best as an all round pressure to cope with the application.

Think about it, if your travelling on your own, there is less load on the tyre, less flex under hard cornering etc etc and so the temp stays reasonable and the tyres perform well. If the car is fully loaded, there is more pressure/load being applyed on the tyres so they heat up quicker, stay hotter and therefore will have slightly more pressure anyway which would help carry the heavier load, stop them from flexing etc........

Appart from friction (or lack thereof), physics is on your side when it comes to tyres. Stick with whats recommended and vary it only to the conditions (summer, winter, offroad, etc).

EDIT As a side note, I remember one of the commentators saying that the started pressure for the V8's is something like 10psi, but when running its around 20 - 25.... Obviously the compound of the tyre, and the loads they are placed under, will mean they are much more prone to heating up.... But it just puts things into a bit of perspective.

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Turbo6man

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Lawsy> I've read some of your theories that have been out there, but this one takes the cake! Fair dinkum mate I hope you don't really believe any of what you just posted. But more importantly I sincerely hope no readers of your post believe it, as what you are saying is not only very wrong it is quite a dangerous proposition.

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tab

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Lawsy> I've read some of your theories that have been out there, but this one takes the cake! Fair dinkum mate I hope you don't really believe any of what you just posted. But more importantly I sincerely hope no readers of your post believe it, as what you are saying is not only very wrong it is quite a dangerous proposition.

<{POST_SNAPBACK}>

:w00t2:

WTF gave you the inspiration for that post Lawsy? Run your tyres as per the placard and get the next set ready in half the km's for a start.

Trent.

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