Nick Heidfeld says Renault will decide on Friday night whether he continues using the new exhaust system introduced in Germany for the balance of the weekend.
Heidfeld tested a rear-facing exhaust concept the team has been evaluating following the debut of its radical forward-facing system at the start of the year. The German driver, eighth quickest today, said the new system had a lot of potential, but admitted there were still issues with it.
"We can see a lot of potential with it, but it is not working perfectly at the moment. There is a lot of work to do," said Heidfeld. "The car definitely feels different with it, and it is quite a big change from what we had before. We have to work quite a bit on it, so we will look at the data later and then see what we do."