Renault is not planning to use its rearward-facing exhausts system during this weekend's Hungarian Grand Prix.
Nick Heidfeld tested the new system during Friday practice in Germany and, despite positive results, the team decided not to use it during the rest of the weekend.
Heidfeld revealed on Thursday in Budapest that Renault is not even planning to run it this weekend, sticking to its forward-facing concept for the time being.
"We are planning, as far as I know, to use the forward version here," said Heidfeld on Thursday. "We are still investigating the rear one. We'll see when we get that back, but for sure we are looking into it."
Despite Renault deciding against using the rearward-facing system, Heidfeld said the car performed better with it.
"The general updates worked. Our performance was clearly better than at Silverstone," he said.
The German driver said Renault only had a few improvements this weekend, with a bigger update planned for the Belgian Grand Prix.
"Just small bits on the aero side," he said about this weekend's updates. "We've lately seen a lot of improvement in the wind tunnel, but we don't have a lot of those parts here unfortunately. For Spa we will have a big update."