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Meanwhile, the mighty Ganassi and Penske teams have laid comparatively low, turning relatively few laps and conserving their limited supply of Firestone tires.
[+] EnlargeJosef Newgarden
Michael Hickey/US PresswireIndyCar rookie Josef Newgarden has impressed with consistently high practice speeds at Indianapolis Motor Speedway.
But the main reason that qualifying promises to be unpredictable is simple: The cars have not run in qualifying specification yet, and will not until Friday's six-hour practice session.
Qualifying spec normally involves teams trimming out their cars by taking away as much downforce and drag as possible. But this year, qualifying has a new twist: more power.
With the Dallara DW12 chassis not producing the kind of 225-mph laps that computer simulations predicted, INDYCAR is increasing turbocharger boost by just under 10 percent for Friday practice and qualifying weekend in an effort to bump up speeds.
The adjustment from 130 to 140 kPa of boost pressure is expected to produce an increase of about 40-50 horsepower and bump speeds by as much as 4 mph. However, because the fastest practice speeds were achieved with the benefit of aerodynamic tows worth up to 3 mph, the pole-winning speed is unlikely to be much faster than the fastest practice laps recorded to date using 130 kPa of boost.
The last-minute power boost has been met with mixed reactions. One leading team manager called it "the definition of insanity," reasoning that the extra power will fundamentally change the race car's handling balance they have been developing for the past six days.
There's a strong likelihood that the more powerful engines will catch someone off guard and produce the first crash in what has been a remarkably clean week on the track. Newgarden suffered the only spin, lightly damaging a wheel and suspension arms on his Dollar General-sponsored DW12 Honda.
INDYCAR officials are hoping for a pole speed approaching 225 mph.
Read More : http://espn.go.com/racing/indycar/story/_/id/7942922/indycar-indianapolis-500-qualifying-crapshoot
