The 25-year-old has used his local knowledge and superior Fiesta Rally3 experience to extend his lead in the all-Ford class.
He won all eight stages despite a minor technical issue and edged Jan Černý by 3min 34.7sec heading into the final day of the rally.
“We had some minor technical issues, but we managed to deal with them properly,” explained Joona. “It wasn’t a big problem, but when your steering wheel is a little to the left while you’re going straight, it can be quite annoying.
“I’m trying to compare my times with the WRC2 cars and I think it was a successful day for us, but we can still go a bit faster,” he added.
Henri Timonen completed the podium 12min 34.3sec behind, while Finnish teenager Toni Herranen fell from second to fourth overall when he hit a rock on the day’s second stage.
The impact damaged the car‘s left rear brake caliper and he fell over 15 minutes limping for service with limited braking power.
- Full coverage of Secto Rally Finland is available on WRC+ All Live hereincluding every stage broadcast as you go along with key interviews, reports and analysis from service park experts.