text: Output is rated  at 6000 rpm with  of torque at 4000 rpm in the Altima 2.5 and Sentra SE-R models. The Sentra SE-R Spec V originally claimed 180 hp, but this was adjusted downward to 175 once production started in late 2001. The redline is 6100 rpm. Altimas that are PZEV compliant create  and  of torque. In the 2005+ Nissan Frontier the QR25DE generates  and  of torque.
  2007+ QR25DE
  The revised QR25DE found in the 2007+ Sentra, Altima, Rogue, etc. has a number of improvements over the older QR25DE. These include:
  A simpler, larger diameter single path resin intake manifold replaced the old dual path design. (Note: California emissions models do have a swirl control valve located in the intake)
  Revised piston crown shape to support a higher compression ratio of 9.6:1.(10.5:1 in Sentra SE-R Spec V.)
  The balancer system has been moved back slightly from the crank pulley to a more centric location in the block.
  Revised cam shaft profile.
  Reinforced connecting rods only available in the Sentra SE-R Spec V 2007-2012 .
  Reduced friction likely through Nissan's extensive use of coatings on pistons, journal bearings, etc.
  Additional engine mount on the top of the motor, pulley side.
  Higher rev limit and improved power output.
  1999–2003 Nissan Bassara-
  2001–2005 Nissan Serena C24-
  2001–2007 Nissan X-Trail T30 APEC export version-