text: VQ38HR By 2007, Nissan's ambition to increase the competitiveness of the Z33 chassis in Super Taikyu racing resulted in the development of a larger displacement engine based on the original VQ35HR Block. It featured the same bore but longer-throw crankshaft (bore × stroke: 95.5 mm × 88.4 mm). The end result was the VQ38HR powered Nismo Type 380RS-C which went on to dominate ST class 1 racing. The 3.8-liter racing engine in the 380RS-C develops maximum power of more than , and maximum torque of . In order to use this new engine in Super GT GT500, limited numbers of the engine were reproduced in the street-legal Fairlady Z Nismo Type 380RS. The VQ38HR engine mounted in the 380RS is a detuned, street version of the racing engine used in the 380RS-C. The engine displacement remains the same, while the intake manifold and exhaust, air-fuel ratio, ignition timing, VTC and other specs have been optimized for street use. The engine produces maximum power of  at 7200 rpm, and maximum torque of  at 4800 rpm.
  The VQ38HR fitted to the following vehicles:
  2007–2008 Nissan Fairlady Z Version Nismo Type 380RS-C
  2007–2008 Nissan Fairlady Z Version Nismo Type 380RS
  Production
  The VQ35HR and VQ25HR engines were built at Nissan's Iwaki Plant in Fukushima Prefecture.
  VHR series
  The VHR series is a variation of the VQ-HR engine series with Nissan's VVEL (Variable Valve Event and Lift).
  VQ37VHR
  It was the first production engine from Nissan using VVEL.
  It has a compression ratio of 11.0:1, with a displacement of , thanks to a bore x stroke of  and a redline of 7,500 rpm.
  It is rated at  at 7,000 rpm and  of torque at 5,200 rpm, and up to  at 7,400 rpm and  of torque at 5,200 rpm.
  Although the engine VQ37VHR gains only  and  in the Nissan 370Z Nismo, torque over the VQ35HR and this higher torque arrives at 5,200 rpm vs 4,800 rpm in the VQ35HR, the torque curve itself is improved and flattened via VVEL variable valve timing for better throttle response and low rpm torque.