"Following the retirement of RB26DETT, Nissan developed a new VR38DETT V6 for the GT-R. Compare with the old straight-6, the 60-degree V6 is shorter and benefits weight distribution of course. This engine is loosely based on the VQ series engine but thoroughly modified – not only added twin-IHI turbochargers and intercoolers, but also converted to hybrid wet/dry-sump lubrication (to withstand high g-force) and closed-deck construction (to increase stiffness). Cast iron cylinder liners have been replaced by a thin layer of plasma coating (Nikasil) in order to reduce friction. Sadly, the variable valve lift mechanism found on VQ37VHR was not used, while the continuous variable cam phasing is limited to intake camshafts only. However, with 3.8 liters of capacity and twin-turbochargers boosting up to 0.7 bar, its output will never disappoint – 480 horsepower is achieved at 6400 rpm, while 433 lb-ft of torque is available continuously from 3200 to 5200 rpm. The former matches Porsche 911 Turbo, although the latter trails that car a little bit (457 lb-ft from 1950-5000 rpm). The old R34 was good for about 330 hp and 293 lb-ft, so the new car is massively more powerful.
Our only disappointment is the IHI turbochargers. Reason one is that they do not have variable vane geometry like Porsche 911 Turbo. This explain why the engine feels less responsive than the Porsche under 3000 rpm. Reason two is that they are made of stainless steel instead of the previous car's ceramic. Although stainless steel turbines are lighter and quicker to spool up, they are less resistant to heat than ceramic turbines. This mean the new GT-R has less space for power tuning. Besides, the turbochargers are now integrated with the exhaust manifolds, so replacing them requires a great deal of work and money."