Nissan QR25 CAMSHAFTS

The QR25DE is a 2.5 L (2488 cc) variant built in Decherd, TN with cast steel connecting rods, a steel timing chain, counter-rotating balance-shafts, and an aluminum intake manifold. The engine bore is 89 mm with a stroke of 100 mm and a compression ratio of 9.5:1. Output is rated 175 hp at 6000 rpm with 180 ft·lb of torque at 4000 rpm in the Altima 2.5 (2002-present) and Sentra SE-R (2002-present) models. Altimas that are PZEV compliant create 170 hp and 175 ft·lb of torque. In the 2005+ Nissan Frontier (2005-present) the QR25DE generates 154 hp and 173 ft·lb of torque. More recently, in the Nissan SE-R Spec V (2007-present) the QR25DE generates 200 hp @ 6600 rpm and 180 ft·lb of torque @ 5200 rpm with a 7000 rpm redline. The crankshaft comes fully balanced allowing removal of the counter-shafts built into the older style QR25. The newer version is also equipped with a composite intake manifold and compression has been bumped up to 10.5:1.