IZOD IndyCar officials have announced that turbochargers' boost pressures will not be changed for this Sunday's 500-mile race.
The IndyCar series rules that maximal boost pressure must be of 130 kilopascals for superspeedway races, although it added an additional 10 kPa for Fast Friday and both days of qualifying last week, resulting in an estimated 40-50 extra horsepower and speeds in excess of 226 mph.
Will Phillips, the series' vice-president of competition explained that keeping the higher boost levels for the race had been considered, but rejected after discussion with the three engine manufacturers, for what he describes as "competition and safety" reasons.
Officials added that for safety reasons, the race director will keep a close eye on the field during the race, making sure that all cars run within 105 per cent of the race leader's pace. They also said that increasing boost pressure would have created more difference in power output between the three engine suppliers.