Wayne Taylor Racing's Cadillac DPi-V.R continued its impressive early season form by commanding the opening day of practice at the Austin, TX round of the IMSA WeatherTech Sportscar Championship.
Having won the first three races at Daytona, Sebring and Long Beach, brothers Ricky and Jordan Taylor were on the pace once again at Circuit of the Americas as the pair swept the two 60-minute sessions, topping one each.
Younger brother Ricky led the morning run with a time of 1:57.116s, before Jordan bested that with a 1:56.595s marker during the afternoon.
That second benchmark was over two seconds quicker than last year's pole time, coincidentally set by Ricky Taylor in an old-spec Daytona Prototype.
Following up the Tayor entry at the end of the opening day was the Cadillac DPi-V.R driven by Action Express team-mates João Barbosa and Christian Fittipaldi.
A 1:57.193s effort from Barbosa put a 0.598 second gap between the two leading Cadillacs, with Ryan Dalziel pedalling the ESM-entered Nissan DPi up to third (+0.705).
Fourth was Jonathan Bomarito in the best of the two Mazda DPis, who like Dalziel clocked his best figure during the morning session.
In GT Le Mans, BMW pipped Ford to the top spot with Alexander Sims lapping quickest aboard the #25 M6.
A 2:03.703s attempt from the British driver was enough to edge out Dirk Müller's Ford GT by a scant 0.036 second margin.
Sandwiching Müller was DTM expat Martin Tomczyk in the sister BMW, ahead of Ryan Briscoe in the #67 Ford.
The four-entry Prototype Challenge category was led by Performance Tech Motorsports' Patricio O'Ward, whilst Tristan Vautier led GT Daytona in the SunEnergy1 Racing Mercedes AMG-GT3.
Result: IMSA COTA FP2
A third IMSA WeatherTech Sportscar Championship practice session is set to take place tomorrow (Friday, May 5) at 09:55 local time, before class-by-class qualifying later in the day.