AUDI RS4 B8 Cold Start (no comment needed ­čÖé – TOPSPEED.sk
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Everytime you start cold powerfull engine (naturally aspirated especially), you get a noise you will not forget. Why?

In the range of first 30 – 90 seconds, ECU is in a mode which heats up the catalysts by providing unnaturally petrol rich mixture that burns very late in the proces of a 4-stroke internal combustion engine. The outcome is something every petrol head loves to hear, and neighbourghs probably too ­čÖé

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