HRT's Formula 1 cars will be used in this season's BOSS GP Series.
Teo Martin, a Spanish businessman, acquired two of the 2011 cars and their equipment after the team folded at the end of last season.
HRT raced in Formula 1 between 2010 and 2012 but failed to score a point.
It is hoped the cars will be prepared by the end of this month.
BOSS GP features Formula 1 cars against Champcars, Indycars, GP2 and F3000 machines, with the next round taking place at the Red Bull Ring next weekend.