Mercedes' Paul di Resta says this weekend's DTM round at the Hungaroring will be much of an unknown quantity despite the venue holding a four-day pre-season test in April.

di Resta lies eighth in the DTM title chase as the series returns to Hungary following a 26-year absence from its calendar.

The Scot, along with his Mercedes team, has struggled so far in this season's initial stages but a tenacious drive last time out in Oschersleben rewarded the former DTM champion with a fine fourth place finish.

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di Resta fears the lack of data around the Hungaroring for Mercedes will be amplified by their apparent lack of raw pace at this stage in proceedings.

"We tested pre-season at the Hungaroring and consequently have some empirical data to work with as we travel to this third race weekend of the year," said the 2010 DTM champion.

"Although we've already tested there, we still have a lot to learn this weekend about the track and setup, especially in the situation in which we find ourselves where we all have to pull together to go on improving our cars' performance."