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Audi has reeled in the leading Porsche at the end of the second free practice session at the WEC season finale in Bahrain.

Championship contenders Marcel Fassler, Andre Lotterer and Benoit Treluyer need to overhaul a 12-point deficit to the Porsche #17 car of Mark Webber, Brendon Hartley and Timo Bernhard in Bahrain to take the WEC Drivers' title and have got off to the ideal start by pulling out over 1.2 seconds on their main rivals.

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The #17 Porsche had to settle for third on the timesheet after being narrowly edged out by the sister Audi machine of Lucas Di Grassi, Loic Duval and Oliver Jarvis.

The championship-leading Porsche began the day quickest after topping FP1, but as the sun set and the floodlights went on Webber and company failed to produce the same lap times - going half a second slower - while the opposing Audi found significant gains.

With the #18 Porsche comfortably in fourth the pair of Toyota cars once again trailed its German rivals, with Mike Conway, Stephan Sarrazin and the retiring Alexander Wurz leading its sister car.

In the LMP2 class, G-Drive's Gustavo Yacaman, Luis Felipe Derani and Ricardo Gonzalez took the top spot honours from rivals KCMG by a comfortable margin of 0.7s.

Ferrari maintained its top position from FP1 in both the LMGTE Pro and LMGTE Am classes, with the #51 AF Corse of Gianmaria Bruni and Toni Vilander controlling the Pro field while SMP's #72 machine edged it in the basement class.