At the start of Nuna4’s project, the rules of the World Solar Challenge were severely modified. Nevertheless, the car managed to drive the race in 33 hours and 17 minutes. She had an average speed of 90km / h, this resulted in first place on the World Solar Challenge 2007.
During the race, however, Nuna4 reached a top speed of 142 kilometers per hour. The big difference in race time compared to its predecessor was a regulation change in the World Solar Challenge. The allowed solar panel area of 9 square meters was reduced to 6 square meters, resulting in lower energy revenues.
The driver position was also altered with stricter rules, allowing the canopy (the cover over the driver pod) to be much larger. This resulted in more drag and caused a lower average speed.
By properly dealing with the new rules, Nuna4 eventually provided for another winning solar car from Delft University of Technology at the World Solar Challenge 2007.