There will be a bit of family rivalry on the back roads in Tokoroa as the Lammers get ready for a challenging drive.

Clim Lammers and sons Jardyne and Clim-Tristan will take on the 2017 Polaris NZ 1000 this weekend.

Clim, a four-time class one champion, will battle with Jardyne in class one, while Clim-Tristan has entered the class three race

It has been all go in the workshop for the past few months as they head into the last month of preparation for their off-roaders. The Polaris New Zealand 1000 endurance race is New Zealand's biggest off-road race.

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Clim said they had their difficulties in preparation for the event but they are raring to go.

"The motor in one of the cars blew up a week out. We thought it was going out for its final preparation run but then it went so we've fixed that," he said.

"We just train out at the house, we've got the area out here to do all of our practice.

"It's a really tough race to win. It's 1000km and it sounds like it will be atrocious weather down there so it will be hard."

Of course there will be a bit of family rivalry, but Clim said "it's cool, they're both awesome drivers."

Family ties won't stop them trying to take out the title.

The NZ 1000 challenges racers to complete 1000km of high-speed competition in production pine forest at Ohakuri on the central North Island's volcanic plateau.

The competitors will race about 500km on each day.

The Lammers family have recently welcomed the sponsorship of Ryco 24/7.

"The team at Ryco 24/7 have helped us find the right parts for our off-roaders. This is one less thing for us to have to worry about, knowing that our motors are backed with great equipment," Clim said.

This event is held every other year and is thrilling to watch. It is at a new venue this year, between Tokoroa and Taupo at Ohakuri Rd.

The race has broken its own entry record with 100 race cars, four-wheel-drives, 'side by side' UTVs and utilities taking on the challenging terrain.

Organiser Kevin Cooper said they had plotted a "classic 1000" with a 46km lap.

"Racers will be blasting along logging roads under tall timber where top cars will crack 210 km/h, then dive off on to old skid tracks barely wide enough for the big cars and trucks, then into a clearing and out on to twisty intermediate tracks," he said.