Temperature at which to check tyre pressures
Discussion
All,
I had a discussion with my fellow TVR driving brother as to the best temperature to check the air pressure in the beasties' tyres. I reckon it should be done when it's hot, so that at 'correct' pressure you get a universally 'flat' tread onto the road at full operating temperature (P1 x V1/T1 and all that). He votes for cold.
Having owned the car for only a month, I guess that the previous owner of my Chimaera must have checked the pressures cold, as the wear pattern on the tyre is centred towards the, er, centre tread of the tyre.
Yours pedantically, Brin
I had a discussion with my fellow TVR driving brother as to the best temperature to check the air pressure in the beasties' tyres. I reckon it should be done when it's hot, so that at 'correct' pressure you get a universally 'flat' tread onto the road at full operating temperature (P1 x V1/T1 and all that). He votes for cold.
Having owned the car for only a month, I guess that the previous owner of my Chimaera must have checked the pressures cold, as the wear pattern on the tyre is centred towards the, er, centre tread of the tyre.
Yours pedantically, Brin
Reccomended pressures set at cold should take into account heat expansion, many TVR drivers have set theirs higher in the past as the 22/24 psi seems too low in theory.
This is what the previous owner might have done.
In saying that a lot of people are now setting their Toyos one or two pounds higher due to the more flexible sidewall than the factory Bridgestone.
This is what the previous owner might have done.
In saying that a lot of people are now setting their Toyos one or two pounds higher due to the more flexible sidewall than the factory Bridgestone.
2 Smokin Barrels said:thats what ive been told also.if you set the pressure when hot itll be lower than required,as the actual pressure rises with the temp.too low a pressure increases friction with road,increases temperatue,increases friction etc then you get a blow out
I've always been told that the published pressures are those corresponding to cold tyres.
I'm prepared to be proved wrong by an expert.
!very dangerous
as it was expained to me
.If you're working with 'cold' settings then you should set them cold. The settings you'll see in your owners manual will be cold settings.
If you're working with 'hot' settings you should set them hot. Sometimes the advice you get from handling experts will be hot settings, sometimes they'll be cold settings, sometimes they won't know the difference (in which case you're listening to the wrong person).
If you're working with 'hot' settings you should set them hot. Sometimes the advice you get from handling experts will be hot settings, sometimes they'll be cold settings, sometimes they won't know the difference (in which case you're listening to the wrong person).
2 Smokin Barrels said:
If you're working with 'cold' settings then you should set them cold.
If you're working with 'hot' settings you should set them hot.
..and if you're working with inbetween settings....
I'd struggle to get the valve caps off whilst I was warming the tyres though..
Toyos all round at the moment which I set at 25lbs cold - seems about right for everyday use and waer pattersn seem OK.
I check pressures regularly particulary if I know I am going to do some of that 'spirited drving' stuff. One night a few weeks ago temps dropped to about -5C and when I checked pressures were all down to 22.5 lbs. So there you go - ambient does matter.
jeff
Big Brin said:
All,
I had a discussion with my fellow TVR driving brother as to the best temperature to check the air pressure in the beasties' tyres. I reckon it should be done when it's hot, so that at 'correct' pressure you get a universally 'flat' tread onto the road at full operating temperature (P1 x V1/T1 and all that). He votes for cold.
You see....you just don't listen to me do you. What is the point of having a little brother if you don't take my "expert" advice!
Paul...(Little Brin)
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