John Goodall and Graham Palich took out the Regularity class in their 2009 Porsche 911, finishing 58 points clear of their nearest challenger after four tough days.
Richard Davis and Bill Best were second in their 2008 HSV W427, with the 1983 Porsche 911 turbo of Graeme Lowe and Gordon Elley third.
“The Porsche has performed really well and we’ve had no problems,” Goodall said.
“It’s been a really enjoyable event and we’ve loved the competition with the other teams in Regularity.
“It was great to finally have some dry roads today, and we made the most of it.”
Regularity teams are limited to a top speed of 130km/h, and must average a pre-determined speed over every stage. They receive penalties if they do not meet their target time.