Nico Hulkenberg admits Force India's strong start to the 2014 campaign has taken him by surprise.
The German finds himself fourth in the Drivers' Championship with 36 points heading into the European season after two fifth-place and two sixth-place finishes.
Although the team were solid during pre-season testing along with all the other Mercedes-powered squads, the 26-year-old hailed the Silverstone outfit's performances as a "big achievement".
"I didn't expect it and I don't think you could have expected it as well," Hulkenberg is quoted as saying by Autosport.
"Winter testing was good, but not that good.
"To come away with so many points is a big achievement."
The Spanish Grand Prix takes place in a fortnight and the race is usually a strong indicator of just what the rest of the season holds in store. While the big teams usually flex their muscles and bring major upgrades, the smaller teams are left behind due to their budget constraints.
Hulkenberg, though, sees no reason why Force India can't keep up over the next few races.
He added: "I don't see any obvious reason why we shouldn't be able to carry the good momentum, but like every year in Formula 1 it's pretty much a development race - you've got to keep bringing performance.
"Maybe at the later point in the season the big teams with the bigger budgets will have more of an advantage, but I see ourselves in a very good position."