http://en.wikipedia.org/wiki/F-22


The dual Pratt & Whitney F119-PW-100 turbofans with afterburners incorporate supercruise and thrust vectoring. Thrust vectoring is in the pitch axis only, with a range of ±20 degrees. The maximum thrust is classified, though most sources place it at about 39,000 lbf (173 kN). Maximum speed is estimated to be Mach 1.72 in supercruise mode; with afterburners, “greater than Mach 2.0” (2,120 km/h), according to Lockheed Martin. The Raptor can easily exceed its design speed limits, particularly at low altitudes; max-speed alerts help prevent the pilot from exceeding the limits. Gen. John P. Jumper, U.S. Air Force Chief of Staff, flew the Raptor faster than 1.7 Mach without afterburners on January 13, 2005. The absence of variable intake ramps may make speeds greater than Mach 2.0 unreachable, but there is no evidence to prove this. Such ramps would be used to prevent engine “flame-out”, which is caused when too much air extinguishes the engine’s “pilot light”, but the intake itself may be designed to prevent such flame-outs. Former Lockheed Raptor chief test pilot Paul Metz says the Raptor has a fixed inlet.

http://www.f-22raptor.com/af_engines.php

On paper the F-22 is slower than most of today's fighters. Maximum speed is set by airframe temperatures and by the use of fixed geometry air inlets. This because variable inlets are hard to make stealthy. However, the F-22 is able to attain its maximum speed (around mach1.8) with all weapons and most of the fuel; something which no other fighter is capable of.