Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 2005– 06 A1 Grand Prix of Nations, Portugal was a A1 Grand Prix race, held on the weekend of October 23, 2005 at the Autodromo do Estoril circuit. Friday was affected by inclement weather, which saw the morning test sessions and practice held in wet conditions due to rain. Local star Alvaro Parente set the quickest time in the first test session, one of two additional timed 40 minute runs that allowed teams to obtain the best set ups on their cars. Parente set a time of 1'54.918, but this was soon eclipsed by series leaders Brazil as Nelson Piquet Jr set a 1'51.916 during the second test.

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