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I wasn't ware that you were supposed to reset the sensor whilst driving. The manual doesn't mention that at all.
Also - I went to the servo... I just went to a close one so the tyres didn't have much of a chance to get very warm.
Personally this is enough accuracy for me... I don't think anything dangerous is going to happen if you are 1 PSI out or something! Tyres inflate and deflate beyond that all the time depending on the conditions.
Relying on a 20c manual gauge or the service station gauges which can be 10-15PSI out is nowhere near the accuracy you want. The only service station gauge I rely on is the Clipsal? electronic units where you preset the pressure and where there is nothing to be damaged by being thrown around and driven over. Even with the Clipsal? unit the pressure can still vary a bit and it should be checked with a reasonable quality gauge (either analog or digital).
Tyres don't vary very much at all during most driving, I rarely see more than ~2 PSI change during driving.
Tyres don't vary very much at all during most driving, I rarely see more than ~2 PSI change during driving.
I've had 4psi increase from cold after 1hr of highway cruise control at 100km/h. Add some enthusisatic driving and you'll see 6psi without much drama.
For around town driving, 2psi is on the money.
Track Car: 06 Polo GTI Red Devil mkII Daily: 2010 VW Jetta Highline Gone but not forgotten: 08 Polo GTI
** All information I provide is probably incorrect until validated by someone else **
Tyres don't vary very much at all during most driving, I rarely see more than ~2 PSI change during driving.
That suggests your tyres are at the right pressure for your driving style.
But it's not simple. The rubber compound, the construction of the tyre, the pressure of the tyre, your style of driving, and the road temperature, are all contributors.
Hard compound tyres (eg the sort sold for good fuel economy, ie with lower rolling resistance but poorer cornering performance) at the right pressure might only rise ~ about 2 psi.
But softer compound tyres, and tyres at a lower pressure, will rise more. At a lower pressure, more sidewall flex warms up the tyre, so pressure rises.
Road temperature is a factor too. Driving around Mt Isa on a hot day gives a greater pressure rise than driving on a cool day with some water on the road.
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