The Silverstone-based squad have scored points in each of the last four races and have leapfrogged Sauber to occupy sixth place in the constructors' standings.
The team has traditionally excelled on low-downforce tracks such as Spa and Monza but team owner Vijay Mallya says they have focused on a higher-downforce configuration this year.
But despite the change Force India still showed relatively strong pace in Belgium and Italy, and Mallya believes the improvement will continue at the more twisty Marina Bay circuit in Singapore.
"The technical direction we all agreed on at the factory was to build a car for all circuits," he said.
"This year's car probably has more downforce than ever before, and therefore less straight-line speed.
"However we went well at Spa and Monza, and now we're going to tracks that require more downforce, which we have. So we're looking to continue this good performance for the remainder of the year."
Adrian Sutil, whose sixth place in Germany is Force India's best result of the season so far, believes there is no limit to what the team can achieve in Singapore.
He said: "The low downforce configuration of Monza did not really work that well for us so Singapore should be better.
"It's the opposite of how it was before: we are now more competitive on downforce circuits, so we should be quite strong. With a good strategy I think anything is possible there."