"Being able to beat Jason [Bunyan] in the heats was great. I got a great start in the final and went around the outside of the others but James [Sargent] just managed to get past me going into the final corner.
"It was still a great result for me and has given me the confidence boost I needed. James has been racing a lot in the UK and has more experience, but once I get overseas I'll improve even more."
Year-on-year the young rider has improved each time he's gone out for the big event, but the New Zealand Under 21 title still eludes him. It's not for the lack of trying and you can understand how hard it must be to go up against riders in their 20s when at your first attempt you're only 15.
"I've made a few mistakes in the trying to get that title and last year I didn't quite have the engine to do the job. In the past I've also been pushed around a bit but it's all part of racing and learning.
"For the New Zealand's [solo championship] though, I had a new engine, which is what I suppose I've been missing for the recent Under 21 champs," said Sims.
At the end of last year it was announced the American Touring Team (speedway) asked Sims to join them for their annual trip to the Continent during the Easter period. Sims is looking forward to the gig where he'll be able to race back-to-back meetings in the UK and a two-day team tournament in Sweden.
Sims will be joined by seven American riders who also want to get a taste of competing abroad and experience the cut and thrust of really competitive racing.
"I've got a few meeting here in New Zealand until the end of the season and then I'm heading of to the UK and Europe.
"They had an extra spot available and asked me if I wanted to come aboard. It will be a good eye opener for me to go back overseas [he went two years ago] and it's a real bonus to be able to do that.
"The tracks in Europe are quite big and they're the sort I like racing on. My long term aim is to get to race in the professional leagues in Europe and then the GPs after that," he said.
Sims and his family are from Kapuka, near Invercargill, where he started riding a 50cc bike on the farm at 7.
Five years later he was a solo speedway rider with an ambition to follow in the footsteps of nine-time world champion and speedway legend Mauger.