Renault will try again with its Red Bull-style rear exhaust exits in Hungary next week, according to Germany's Auto Motor und Sport.
While Vitaly Petrov continued to use the front-exiting solution that has been on the R31 all season, teammate Nick Heidfeld tested the new layout on Friday at the Nurburgring.
But the German's car was reverted to Silverstone specification for Saturday.
"It's too early to consider running the rearward exhaust in anger because it isn't competitive with the forward-facing yet, but it's certainly something we are going to keep exploring and considering," said technical director James Allison.
Added Heidfeld: "The new system definitely has potential but it's very complicated. It's hard to get something like that up and running so quickly.
"We didn't expect it to just work straight away."