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Tyres Pressures.

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Just a reminder check your tyres i did and yes they were under deflated .

;)Thats why the car was all over the place on the M40.

Eddie King.

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Very sound advice Eddie!

The subject of Tyres & Tyre pressure was once discussed at length on another Lotus Forum to which I occasionally add my "little bit"
It cannot be emphasised enough the importance of Tyre pressures on any Car.
The Tyres are the most important single Component on a Car, the other Components being "a means to an end"
The "correct" Tyre pressure can transform a Lotus's handling & comfort.
The pressures stated in the Owner's Handbook are always a good starting point but a bit of adjustment to suit the owners style of driving can work wonders.
There are no real rules because everyone is different, different Tyres & Suspension will react differently; so a lot of variables to be taken into consideration.
As an example my 1970 Elan has fast Road Suspension, LSD, wider Wheels & modern Tyres all of which feels "Stodgy" & heavy on the recommended pressures.
With a quite considerable ~+5Lbf increase in pressure the Car becomes as nimble as a Ballet Dancer with superbly precise "turn in"
A quite remarkable transformation :rolleyes:

Cheers
John

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Boyle's Law [url="http://en.wikipedia.org/wiki/Boyle's_law"]SEE HERE [/url]is responsible for low tyre pressures at the onset of cold weather. Broadly speaking, a drop in temperature means that any gas inside the tyres will take up less space, ergo the pressure is lower.

It's natural phenomenon and everybody needs to put more air (or maybe nitrogen if you are a specialist) in their tyres at this time of year.

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[quote name='the83man' date='21 October 2010 - 05:27 PM' timestamp='1287678446' post='1704']
Boyle's Law [url="http://en.wikipedia.org/wiki/Boyle's_law"]SEE HERE [/url]is responsible for low tyre pressures at the onset of cold weather. Broadly speaking, a drop in temperature means that any gas inside the tyres will take up less space, ergo the pressure is lower.

It's natural phenomenon and everybody needs to put more air (or maybe nitrogen if you are a specialist) in their tyres at this time of year.
[/quote]

the83man C.Eng. ;)

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Europeans' concern about the spiralling cost of fuel is being exacerbated by the state of motorists' tyres according to research conducted by Bridgestone. According to the manufacturer, four billion litres - worth approximately £4.6 billion - of fuel are being wasted every year due to the under-inflated tyres of four in every five motorists. This inadequate tyre care does not just affect motorists' wallets; the wasted fuel equates to 9.3 million tonnes of unnecessary CO2 emissions, and therefore increases the harm to the environment caused by motoring. The findings come from safety checks carried out on 52,400 cars in 15 E.U countries in 2009.
The Bridgestone results show 81 per cent of motorists are driving on under-inflated tyres. This habit is leading to the equivalent of 3.47 g/km of unnecessary additional CO2 emissions a year for every car on Europe's roads. The tyre safety checks were conducted on 52,400 vehicles by Bridgestone at shopping centres and public car parks in 15 European countries last year. They form part of the 'Think Before You Drive' road safety education campaign launched in 2005 as a worldwide joint initiative between the Fédération Internationale de l'Automobile Foundation, Bridgestone Corporation and national motoring clubs. The campaign's scope has increased more than five-fold since that year, when 8,700 vehicles were checked in ten countries.

The test results also show that over a quarter (26.5 per cent) of motorists are driving on what Bridgestone calls "seriously under-inflated tyres" (at least 0.5 bar below vehicle constructor recommended pressure) and 7.5 per cent are putting their safety at greater risk by driving on "severely under-inflated tyres" (at least 0.75 bar below recommended pressure). Almost 17 per cent of tyres on the road are also worn down below the EU legal minimum of 1.6 mm tread depth. Around 9 per cent of inspected tyres are both severely worn and severely under inflated.
We hope you found this thought provoking - when did you last check your tyre pressures?
We hope to see you soon,
Best wishes,
Anna @ Bespoke Wheels Ltd
01926 88 77 22

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I for one don't doubt the stated facts. When walking through car parks so many cars with under inflated tyres can be observed.

However during my last visit to England I suggested that a friend checked the tyre pressures in her car & I was amazed how difficult it was to find a filling station that provided compressed air.
When we found one we had to put money into the bloomin' machine.
What has the World come too?

Cheers
John

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When first checking in the hand book, I found that Lotus quoted recommended tyre pressure to half a pound per sq inch. Never seen that before. I am sad enough to find it most entertaining and also sad enough to spend a few extra minutes getting it exactly right. If they are that bothered, I feel I should be too. Tee hee

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Hope you do all that with them cold and in the shade? As soon as you get any sun on the tyre, let alone drive on it, it will heat up and go up in pressure ;o)

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Yes. I shuffle around in my dirty raincoat, mumbling to my tyre gauge in a darkened garage. The wife knows not to disturb me!

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Yes. I shuffle around in my dirty raincoat, mumbling to my tyre gauge in a darkened garage. The wife knows not to disturb me!

 

:lol:

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