Chaves Leads Field as Teams Head Into Fast Friday

As qualifying draws near for the 100th Running of the Indianapolis 500 presented by PennGrade Motor Oil, a pair of three-letter abbreviations are being mentioned more often around Indianapolis Motor Speedway: “NTS” and “kPa”

The first stands for “no-tow speed” or the speed a car achieved around the 2.5-mile oval without help of an aerodynamic tow. The second is short for kilopascals, the unit of measurement to gauge turbocharger pressure on the Verizon IndyCar Series machines.

View Practice 4 Results; Combined Practice Results

And while Gabby Chaves was fastest in today’s fourth day of practice for the epic May 29 race, with a tow-assisted lap of 227.961 mph in the No. 19 Dale Coyne Racing Boy Scouts of America Honda, the focus also centered on the no-tow list paced by Will Power with a lap of 225.381 mph in the No. 12 Verizon Team Penske Chevrolet.

"We had some good runs out there today,” said Power, the 2014 Verizon IndyCar Series champion and 2015 Indianapolis 500 runner-up. “We definitely made some gains and have a little bit more to go, as we're still making adjustments for the coming days. I'm pretty confident that the Verizon Chevrolet will be in good shape for qualifying and the weather conditions are supposed to be good, too, so that helps as well.”

Chaves was followed on the overall speed chart today by Townsend Bell in the No. 29 Andretti Autosport Honda (227.593), Carlos Munoz in the No. 26 Andretti Autosport Honda (227.589), Conor Daly in the No. 18 ShirtsForAmerica.com Honda (227.524) and Charlie Kimball in the No. 42 Tresiba Chevrolet (227.477).

Speeds are expected to increase in practice Friday when the turbocharger boost level for the Chevrolet and Honda 2.2-liter, twin-turbocharged V-6 engines is raised 10 kPa to 140. That should equate to about an additional 40 horsepower.

All but one of the 33 cars entered turned laps today. Rahal Letterman Lanigan Racing spent most of the day rebuilding the No. 16 RLL/Mi-Jack/Manitowac Honda that rookie Spencer Pigot crashed in practice Wednesday. A total of 2,563 laps were turned today.

Following Power on the no-tow speed chart were Graham Rahal in the No. 15 Steak ‘n Shake Honda (225.321), reigning Verizon IndyCar Series champion Scott Dixon in the No. 9 Target Chip Ganassi Racing Chevy (225.237) and defending Indy 500 winner Juan Pablo Montoya in the No. 2 Verizon Team Penske Chevy (225.156).

"The Verizon Chevy ran well today,” Montoya said. “We had a little bit of a problem there earlier, but we made some changes and were able to make progress towards the end of practice.  We're getting up to speed, ending practice much faster than we did previously.

“Honestly, I'm very happy with where we're going right now."

Practice runs from noon-6 p.m. ET Friday and will be streamed live on RaceControl.IndyCar.com. The draw for qualifying positions follows at 6:15 p.m.

Two hours of final pre-qualifying practice is scheduled from 8-10 a.m. Saturday. The first day of qualifications to set the provisional 33 positions and lock in the Fast Nine Shootout competitors is scheduled from 11 a.m.-5:50 p.m. Saturday.

Group 1 qualifying to determine race starting posit ions 10-33 takes place from 2:45-4:45 p.m. Sunday, with the Fast Nine Shootout to decide the Verizon P1 Award pole winner and the starting order of the first three rows from 5-5:45 p.m.

Saturday coverage takes place on ESPN3 (11 a.m.-3 p.m. ET) and ABC (4-6 p.m. ET), with additional on-track action that day streaming on RaceControl.IndyCar.com. Sunday coverage is again on ESPN3 (2-4 p.m. ET) and ABC (4-6 p.m. ET), with practice sessions from noon-2 p.m. streaming on RaceControl.IndyCar.com

Coverage of the 100th Running of the Indianapolis 500 begins at 11 a.m. ET May 29 on ABC and the Advance Auto Parts INDYCAR Radio Network.