Sep.5 (GMM) Lotus will not race its highly-anticipated double DRS-inspired 'device' at least until Suzuka next month.
The Enstone based team intended to use the straightline speed-boosting system at Spa, but Friday's practice sessions were a washout.
And Lotus will also not fit the device to Kimi Raikkonen and Jerome d'Ambrosio's cars at Monza, due to the unique low-downforce configuration of the historic track.
"In Singapore you won't see it either," said technical director James Allison, "because it's too high a downforce circuit with insufficient straights for it to be worthwhile.
"The earliest you might see it now is Suzuka," he added.