In his rookie year he took one third-place finish, set fastest lap time twice and ended the season in 8th place overall.

In 2007 Jonas Gelžinis made his debut in "Porsche Carrera Cup Scandinavia" together with Juta Racing.

In the following year Jonas Gelžinis enjoyed greater success, scored 131 points and took 7th place in final standings.

Jonas Gelžinis continued to impress and took 6th place in overall standings, scoring 167 points and became the winner of "Pro-AM1" class.

Jonas Gelžinis continued to demonstrate strong form in 2013, finishing on podium in the first six races of the season and taking the championship lead.

This was the first time in Porsche Carrera Cup Great Britain history when racing driver from outside United Kingdom had taken the lead in the standings.

[2] After unsuccessful weekend in Oulton Park Jonas Gelžinis lost championship lead to Michael Meadows, but then took three victories in a row in Croft Circuit and Snetterton.

Jonas Gelžinis took four more podium finishes in the second half of the season and kept his championship hopes until the final round.

In 2023, Gelžinis formed part of the driver lineup for Juta Racing's entry into the ADAC GT Masters, as they became the first Lithuanian team to enter the series.