2018 Mystery Box Rally line-up includes Macarthur's Lisa and Brendan Scott

For some families, the idea of spending five days straight in a car together may seem like a nightmare.

But St Andrews resident Lisa Scott and her son Brendan are set to take on the challenge for the 2018 Mystery Box Rally.

The rally runs from October 20 to 24 and involves teams of two people driving a mysterious 2500-kilometre route through outback Australia.

Participants start and finish the drive in Mildura, Victoria but they have no clues what route their journey will take.

As part of the rally rules, it doesn’t matter what the make or model of the car is.

However, the vehicle must be at least 25 years old and have eight-ply tyres.

The Scotts will drive a 1993 Holden Commodore VP, which the pair found while trawling the internet earlier this year.

The Macarthur duo’s rally team name is “Crazy Nana”.

The "Crazy Nana" car, a 1993 Holden Commodore VP. Picture: Supplied

The "Crazy Nana" car, a 1993 Holden Commodore VP. Picture: Supplied

Ms Scott became interested in the Mystery Box Rally after watching a similar event on television.

The Scott family has long been fans of motorsport and the TV event inspired Ms Scott to research the rally.

Her son is passionate about drag racing, while Ms Scott grew up racing go-karts.

However, she admitted the event was likely to be challenging for the pair.

“The rally is all about having fun,” she said.

“My son is a bit of a hoon so I’ll be hanging on tight when he is driving.

“We’ve never been in a car together for that long at one time. I think it will be a test for us."

Ms Scott said she looked forward to exploring towns around Australia.

“The rally rules say we have to spend money in the town where we stay [each night],” she said.

“Brendan and I will then sleep in swags in the outback.”

We’ve [Brendan and I] never been in a car together for that long at one time. I think it will be a test for us.

St Andrews resident Lisa Scott

The Scotts are fundraising for the Cancer Council and team Crazy Nana has already generated more than $6,500.

The tally has already exceeded the rally’s goal per team, but Ms Scott said she hoped to raise $10,000.

Ms Scott said several family members and friends had lost their lives to cancer.

“Their names are on the window of our car as a tribute,” she said.

To make a donation to Crazy Nana, visit the team’s Mystery Box Rally page.