LONG POND, Pa. - With the aim of learning more about the Tricky Triangle, Justin Wilson and Carlos Huertas shared Pocono Raceway with Team Penske's Helio Castroneves, Juan Pablo Montoya and Will Power in preparation for next month's Pocono INDYCAR 500.

The driver who may have benefited most from the June 17 test day was Montoya, who raced 14 times at Pocono Raceway in a stock car — winning the pole in 2012 and finishing second in the August race of 2009.

"It's a huge difference," he said. "Here is the only place on NASCAR ovals that you have to downshift, and we run pretty much wide open all the way around. It's unbelievable. It's challenging because all three corners are different.

"The tunnel turn (the second turn on the Tricky Triangle) is not that bad. It seems to be a simple corner. Turn 3 is a flat corner where the entry is an issue, and Turn 1 is the place where it's really banked and a tighter corner where you ask a lot more of the front end. Getting the balance right for all three will be a challenge."

A second test day is set for Thursday and will have a larger contingent, including four cars from the Andretti Autosport team that includes 2014 Indianapolis 500 winner Ryan Hunter-Reay and Nazareth native Marco Andretti.

Other teams expected are Rahal Letterman Lanigan Racing, Ed Carpenter Racing and KV Racing Technology. The session, beginning at about 9 a.m., will be open to the public, but only in the main grandstand.