Jordan Taylor was quickest on the second day of the 'Roar Before 24' testing sessions ahead of the 2015 Rolex 24 at Daytona.

After the Chip Ganassi Riley Ford topped the timesheets in the two sessions on Friday, Taylor put the #10 Wayne Taylor Racing Corvette DP fastest during one of four sessions - including a 90-minute practice at night - with a best lap of 1:39.181.

It was during the night session that Sebastien Bourdais set the second quickest lap of the day, clocking a 1:39.310 in the defending champion No. 5 Action Express Racing Corvette DP. Third fastest was Ozz Negri in the Honda-powered Michael Shank Racing Ligier JS P2, continuing the car's strong performance from the first day with a 1:39.342.

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"These days you need to have the fastest car because when you get to the final hour [of the race] you need to race everyone," Taylor said. "Five years ago we wouldn't focus on a lap-time car; we'd just make it as comfortable as possible. Now you need to work on lap times and race pace because you know you're going to come to that last hour having to race for the win."

However, it was a less successful second day for the DeltaWing, which had shown promise in the opening two sessions. The team was forced to end its running after an incident in Saturday's afternoon session. The prototype sustained damage to the floor after running through debris when another car hit the wall on the front straight just ahead of driver Memo Rojas, and while the team was working through the resulting differences in downforce, Rojas lost control in the kink and tapped the wall. The team decided the damage was too significant to repair at the track and will continue work back at its race shop.

Other class leaders were Earl Bamber in GTLM for Porsche - setting a 1:44.316 in the #912 Porsche North America Porsche 911 RSR - and Marc Goossens in GTD with a 1:47.373 in the #33 Dodge Viper SRT GT3-R.

Colin Braun set the pace in the PC class, clocking a 1:41.769 in the #54 CORE autosport Oreca.