Pachacuti notched his third win for the season in the Col Saunders Memorial Brighton Cup over 2579 metres at Tattersall's Park in Hobart last Sunday night.
The four-year-old gelded son offace the breeze for a short while before rolling to the front and he went on to score comfortably from Our Chain of Command and Biggernbettermax.
Pachacuti clocked a mile rate of 2m.00.19 and cruised home his last half mile (800m) in 59.7 seconds.
Rattray said Pachacuti was doing everything he expected at this stage of his preparation with the Ascot Gold Cup his next mission in Hobart on Sunday.
"The Ascot Gold Cup looks a nice race for him so we'll head back to Hobart on Sunday," Rattray said.
"But it isn't going to be easy withy his preparation for the Breeders Crown in August because there aren't many suitable races for him in Tasmania in the weeks leading up to the Breeders Crown heats," he said.
Pachacuti produced some sensational runs in the 3YO Breeders Crown series last season wining a semi-final at Ballarat before he finished a game second to boom NZ three-year-old Bit Of A Legend in the Group 1 final at Melton.
Since he returned from a stint in NSW with Barrie's son James, Pachacuti has won three of his four starts on home soil.
By Peter Staples