Hispania Racing team boss Colin Kolles has hinted that the team could be prepared to launch a protest against off-throttle blown diffusers at next weekend's Monaco Grand Prix.

The team is one of only three teams not using the system, which the FIA had planned to ban ahead of the Spanish Grand Prix only to perform a u-turn after discussions with the teams.

With the issue set to be discussed by the Technical Working Group, it is likely that the diffusers will still be in place on the streets of Monte Carlo and Kolles said that could lead to the Spanish team making a protest over its continued usage.

"It is clear that the other cars are illegal and it brings the teams a huge advantage," Kolles told the BBC. "You cannot influence the aerodynamics by hot exhaust gasses or any moveable devices.

"We have studied this very carefully. The point is it is not corresponding to the regulations. It brings the other teams a huge advantage.

"If this is not going to be stopped before Monaco we have no other choice than to make a protest. I cannot tell you at what stage during the Monaco Grand Prix [we would protest].

"The only reason why we are not considering it [now] is because we were not involved in any sporting decision today."

Red Bull team boss Christian Horner said he found the intended protest surprising, arguing that the Hispania - currently bottom of the championship standings - had 'bigger issues' to worry about.

Indeed, F1 2011 returnee Narain Karthikeyan underlined that by revealing post-race that a melting seat had made the 61 laps of the Circuit de Catalunya that he covered on Sunday something of a fiery experience. The Indian - 21st and last and five laps down at the chequered flag - was the sole HRT finisher in Spain, with team-mate Vitantonio Liuzzi departing the fray with gearbox woes, albeit rather happier with progress.

"It was a very hard race," conceded Karthikeyan. "The tyres were degrading a lot, especially the rear ones, making it very difficult to drive. The first few laps were alright, but then the rear started giving me a lot of problems. I also had some trouble with my seat - I burnt my back, and at times the pain was unbearable.

"The positive aspect was that I finished the race, although we didn't get much out of it. We need to find out why we were off the pace; we thought our race pace would improve this weekend, but that has not been the case. Qualifying was good, but our race pace wasn't good, unlike in previous races. Perhaps this is because of the drastic difference between 'Prime' and 'Option' compounds, which made the set-up very difficult and resulted in massive oversteer. We now need to work on this."

"I had a great start to the race, passing a few cars into the first corner just like at the last grand prix," added Liuzzi. "Everything was going fine; the balance of the car was good, I was ahead of both Virgin cars and pulling away in the first stint. This confirmed the step forward we'd predicted from the last race.

"After the first pit-stop, though, with the second set of tyres we lost some grip at the rear, just like in qualifying. I also started feeling issues with the upshift; it was getting worse and worse, and I eventually had to stop. We have to investigate why this happened, but it's still too early to say what the reason was.

"It's a real shame, because without this issue we could have had better pace for the second stint and fought with the Virgins until the end. Narain finished the race, which is always positive because it means we can have more data, but it's now time to start thinking about racing and not just finishing, because we're growing and must try and get ahead of Virgin."

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