IndyCar has confirmed that boost levels will remained unchanged from those used in 2012 for this year's Indianapolis 500.
Boost will be increased from 130 kPa to 140 kPa for tomorrow's 'Fast Friday' as well as Pole Day and Bump Day on Saturday and Sunday respectively.
"What we had last year worked really well for the full sequence of the month of May," said Will Phillips, IndyCar vice-president for technology.
"With the car performance progressing incrementally through natural development of the chassis and aerodynamics, lap speeds are expected to increase in qualifying."
The pressure change, which adds an estimated 40bhp, will revert back to 130 kPa for Carb Day on May 24 and the race on May 26.