Renault technical director James Allison says it is difficult to quantify how the FIA's engine mapping ban will affect the team and the rest of the grid.
The FIA wrote to the teams on Tuesday to inform them that they would no longer be allowed to change the engine map between qualifying and the race. All of the teams run enhanced map settings during qualifying which can't be sustained during the race. Allison said that any negative effect on performance would be as a result of a car's balance being disrupted by the reduced downforce.
"It is not easy to judge the effect of this change on our competitiveness," Allison told the Renualt website. "The loss for each blown floor car will come from two separate effects - how much downforce will you lose and, in addition, how much will the loss of this downforce upset the balance of the car.
"All blown floor cars will loose downforce under braking as a result of these new restrictions. Some teams will lose more and some teams less; it is hard to know exactly what relative loss LRGP will suffer. However, it is possible that we will suffer less on the balance shift side of the equation because our forward exit exhausts produce their effect quite near the middle of the car. This means that as the exhaust blow waxes and wanes, it does not really disturb the aerobalance of the car too much.
"With a rearward blower, the downforce from the exhaust is all generated at the rear axle. As the new rules reduce the blowing effect on corner entry much more than corner exit, it is possible that the rearward blowers will tend to suffer more nervousness under braking and more understeer on exit as a result of the new restrictions."
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