HRT will run a major aerodynamic upgrade package on Pedro de la Rosa car in Friday practice for the Spanish Grand Prix.
The package will include a new front and rear wing as well as a modified floor.
The Spaniard will run it for the first time tomorrow, with team-mate Narain Karthikeyan also scheduled to get the parts in time for Saturday's running.
De la Rosa is hopeful that the upgrades will allow HRT to continue to narrow the margin by which it is off the pace.
"We have been gradually closing the gap to pole position and that's what we have to aim [to keep doing]," said de la Rosa. "We have to make sure that every race our car is a little bit quicker than the previous one."
HRT is also scheduled to bring further updates for Monaco and Karthikeyan is eager to see whether the aerodynamic parts will allow it to close the gap to Marussia in Spain.
"We think that we will improve quite a bit," said Karthikeyan. "Tomorrow, Pedro has all of the parts to evaluate it and I have the package on Saturday as production was a bit late.
"Marussia will also make a step, so we will have to see where we are. It will be interesting to see."