Renault number two driver Nelson Piquet Jr had the honour of giving the squad's new F1 challenger, the R29, its first run today at the Algarve Motor Park near Portimao.
The Brazilian hit the track following the launch of the car at the Portuguese circuit and while his running was somewhat disrupted by the weather, he was still pleased with his initial impressions.
"It feels great to be in the R29, even though the weather was not good," said Nelson after his first day in the car. "Today was all about adding miles to the car, collecting data and learning as much as we could.
"Hopefully the rest of the week will allow us to build on the progress we have made today."
Piquet Jr will now continue testing on Tuesday, before Fernando Alonso takes over for the final two days on Wednesday and Thursday.
"The team has had a very busy development programme to allow us to be ready for the first January test with the new car," added the two-time world champion. "Now we are all looking forward to seeing the result of all that effort on the racetrack, beginning this week."