Karjalainen was quickest in all three sessions in his Team Goddard Dallara 304 TOM'S car whilst Turvey was second in his JA Motorsport 304 in the first two sessions but dropped to third when Grubmuller set a faster time in the final session in another 304 car entered by Aran Racing.
Practice continues on Friday before qualifying and race one on Saturday followed by two races on Sunday.
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