Auret, a Mt Egmont 4WD Club member, won the national title by one point with co-driver Paul Barnes in April.
He was looking forward to trying out a completely different environment.
"The harder the better, generally we like. This is crazy extreme, this course coming up. Love the challenge."
Auret helped the children strap in and fire up the 427 cubic inch engine, built into the 2013 covette chassis at a weight of 1200kg.
"They love it, something completely different for them."
The children all received tickets to attend Sunday's challenge. The challenge will be held at 2278 SH3 Turakina, 10am-4pm Entry $20 per person and free for children under 5. Cash only.
Hot food and refreshments available on the day.