NIssan VQ35DE
The VQ35HR update was first seen in the US in the 2005 G35 6MT models. By 2007, the new 2nd gen G35 models had the updated engine. Nissan updated the VQ line with the addition of the 3.5 L VQ35HR (for "High Revolution" or "High Response"). It produces 315 PS (311 hp/232 kW) (US Market: 306 PS (302 hp/225 kW) due to new US federal measurement regulations) at 6,800 rpm and 37 kg·m (363 N·m; 268 ft·lbf) at 4,800 rpm, using a compression ratio of 10.6:1. It has NDIS (Nissan Direct Ignition System) and CVTC with hydraulic actuation on the intake cam and electromagnetic on the exhaust cam. Redline is 7,500 rpm. Reportedly over 80% of the internal components were redesigned or strengthened to handle an increased RPM range sporting a lofty 7,500 rpm red line. A new dual-path intake (two air cleaners, throttle bodies, etc.) lowers intake tract restriction by 18 percent and new equal-length exhaust manifolds lead into mufflers that are 25 percent freer flowing for all around better gas flow. The new intake is said to benefit from a ram-air effect adding three horsepower at 60 mph (not accounted for by SAE testing methods). The electrically actuated variable valve timing on the exhaust cams to broaden the torque curve is new over the "DE" engine. The new engine block retains the same bore and stroke, but the connecting rods were lengthened and the block deck was raised by 8.4 mm to reduce piston side-loads. This modification, along with the use of larger crank bearings with main bearing caps reinforced by a rigid ladder-type main cap girdle to allow the engine reliably rev to 7500 rpm. With an increase in compression ratio from 10.3:1 to 10.6:1 these changes add 26 more horsepower (306 total + 3 hp ram air efect not measured by SAE testing = 309 hp). Peak torque is down 2 pound-feet from the old "DE" engine (268 vs. 270) but the torque curve is higher and flatter across most of the rpm range, and especially in the lower rpm range. Earlier "HR" engines have been known to experience oil consumption issues, according to Infiniti's ITB08-002 document, titled "2005-2007 Engine Oil Level is Low," which was released in 2008.
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