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        "description": "<p>In the quiet Welsh countryside, a rally car is put through a high-octane test before a big rally.</p>", 
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        "title": "I Didn't Know That: Rally Car Testing", 
        "url": "http://video.nationalgeographic.com/video/science/technology-sci/idkt-rally-car-testing/", 
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                    "url": "http://science.nationalgeographic.com/science/", 
                    "name": "More About Science"
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        "credit": "National Geographic", 
        "smil": "http://video.nationalgeographic.com/video/player/data/xml/idkt-rally-car-testing.smil", 
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        "transcript": "<p>Here in the sleepy Welsh countryside the sheep are grazing, the grass is green and the roads are winding. But this is no ordinary road.\u00a0 It's nearly 50 kilometres of testing track...... for rally cars!</p><p>This is multiple National Rally Championship winner Marcus Dodd. Pushing his Hyundai around the track at speeds of over 170 kilometres per hour, he's testing its performance in preparation for a vital upcoming rally. This is essential to make sure the car is fit to take on the punishing course.\u00a0 And a rally car is a lot more demanding than your average motor.\u00a0 High Octane fuel for this bad boy costs more than twice as much as normal petrol, and the 140 quid tyres are changed after only 48 kilometres.</p><p>This rallying beast is based on a domestic car.\u00a0 The souping up process took over 500 hours and its now worth \u00a3200,000. In a rally, it'll reach up to 200 kilometres an hour in 6th gear.</p><p>RACING MECHANIC PTC: We probably test 7 times a year and then we also do a shake down before each event which is actually what we're doing today.\u00a0 We just test different things.\u00a0 Er new gear boxes, suspension, different engines.\u00a0 As many things as the engineers want to play with.</p><p>\u00a350,000 of the price tag is the monitoring system.\u00a0 Around 100 sensors and 2 onboard computers record the performance of almost every part of the car in one hundredths of a second.</p><p>After a run, engineers download the data to see which parts of the car need tweaking. They've spotted the exhaust sensor may be broken because of excessive heat...and investigate.</p><p>This is the EGT sensor. There's a hole in the end from the temperature where it's burnt the end off, so effectively the sensors now no longer any use and we'll have to throw it away and put a new one on.</p><p>With the EGT - or exhaust gas temperature sensor changed, it's time for another run.</p><p>This time, all the sensors read A OK, so the car is fit for the rally.</p>", 
        "id": "idkt-rally-car-testing"
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