VQ37VHR Engine

Nissan VQ engines, successors of VE and VG motors, were first released in 1994, but they still remain among the most reliable and powerful motors, constantly getting to Ward’s 10 Best Engines list. They are V6 motors with the capacity ranging from 2.0 to 4.0L and featuring aluminum block and heads. Being constantly updated, engines keep modernized variable timing system and direct fuel injection. But let’s take a closer look at VQ37VHR, a motor employed for celebrated Nissan 370Z car.

Manufacture of VQ37VHR was launched in 2007. It was built on framework of VQ35HR. Being the most modernized engine of the series, this 3.7L motor is utilized for a number or Infiniti models and Nissan sports cars.

Having identical cylinder bore, VQ37VHR gained taller cylinder block than its predecessor plus a larger stroke. Moreover, upgraded light pistons and connecting rods were applied. Consequently, that helped engineers to increase capacity from 3.5 to 3.7L.

Motor was supplied with redesigned aluminum cylinder heads with 2 camshafts, featuring variable valve timing CVTC, and 12 valves. In addition to modernized inside channels, VQ37VHR gained fresh intake and exhaust valves. Moreover, Nissan Variable Valve Event and Lift system were utilized for the first time. While timing chain remained unchanged, the engine top features an upgraded plastic intake manifold.

In comparison with VQ35HR, torque was increased by 2 Nm (1.5 ft-lb), but maximum rpm changed from 4,800 to 5,200. Besides, torque curve was subjected to some optimization.

VQ37VHR SPECS

Engine code VQ37VHR
Layout Four stroke, V6
Fuel type Gasoline (petrol)
Production 2007-present
Displacement 3.7 L, 3,696 cc (225.53 cu in)
Fuel system Direct Injection
Power adder None
Power output 330 PS (243 kW, 325 HP) at 7,000 rpm
333 PS (245 kW, 328 HP) at 7,000 rpm
336 PS (247 kW, 331 HP) at 7,000 rpm
355 PS (261 kW, 350 HP) at 7,400 rpm
Torque output 361 Nm (36.8 kg·m, 266.3 lb·ft) at 5,200 rpm
363 Nm (37.0 kg·m, 267.7 lb·ft) at 5,200 rpm
365 Nm (37.2 kg·m, 269.2 lb·ft) at 5,200 rpm
374 Nm (38.1 kg·m, 275.3 lb·ft) at 5,200 rpm
Firing order 1-2-3-4-5-6
Recommended engine oil 0W-30
0W-40
5W-30
5W-40
10W-30
10W-40
15W-40
Engine oil capacity, L (qt.) 5.7 (6.0)
Oil change interval, km (miles) 5,000-10,000
(3,000-6,000)
Cylinder block
Cylinder block alloy Aluminium
Compression ratio: 11:1
Cylinder bore: 95.5 mm (3.760 in)
Piston stroke: 86.0 mm (3.386 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 4
Cylinder inner diameter (standard): 95.500-95.510 mm (3.7598-3.7602 in)
Piston skirt diameter (standard): 95.480-95.490 mm (3.7590-3.7594 in)
Piston pin outer diameter: 21.989-21.995 mm (0.8657-0.8659 in)
Piston ring side clearance: Top 0.040-0.080 mm (0.0016-0.0031 in)
Second 0.030-0.070 mm (0.0012-0.0028 in)
Oil 0.055-0.155 mm (0.0022-0.0061 in)
Piston ring end gap: Top 0.23-0.33 mm (0.0091-0.0130 in)
Second 0.23-0.33 mm (0.0091-0.0130 in)
Oil 0.17-0.47 mm (0.0067-0.0185 in)
Connecting rod bushing inner diameter: 22.000-22.006 mm (0.8661-0.8664 in)
Connecting rod big end diameter: 57.000 mm (2.2441 in)
Connecting rod center distance: 149.45-149.55 mm (5.88 – 5.89 in)
Crankshaft main journal diameter: 64.975 mm (2.5581 in)
Crankpin diameter: 53.974 mm (2.1250 in)
Crankshaft center distance: 42.96-43.04 mm (1.6913-1.6945 in)
Block head alloy Aluminium
Valve Arrangement: DOHC, chain drive
Cylinder head height: 126.4 mm (4.98 in)
Valves: 24 (4 valves per cylinder)
Valve head diameter: INTAKE 36.6-36.9 mm (1.441-1.453 in)
EXHAUST 30.2-30.5 mm (1.189-1.201 in)
Valve length: INTAKE 100.11 mm (3.94 in)
EXHAUST 94.67 mm (3.7272 in)
Valve stem diameter: INTAKE 5.965-5.980 mm (0.2348-0.2354 in)
EXHAUST 5.962-5.970 mm (0.2347-0.2350 in)
Valve spring free length: INTAKE 45.66 mm (1.7976 in)
EXHAUST 43.85 mm (1.7264 in)
Exhaust camshaft cam height: Bank 1 45.015-45.205 mm (1.7722-1.7797 in)
Bank 2 46.735-46.925 mm (1.8400-1.8474 in)
Exhaust camshaft journal diameter: №1 25.935-25.955 mm (1.0211-1.0218 in)
№2, 3, 4, 5 23.445-23.465 mm (0.9230-0.9238 in)

Applications

  • 2008 – 2013 Infiniti G37 Coupe, Sedan, and Convertible
  • 2008 – present Nissan Skyline V36 370 GT Coupe and Sedan
  • 2009 – present Nissan Fuga 370GT
  • 2009 – 2013 Infiniti FX37 and EX37
  • 2009 – present Nissan 370Z/Fairlady Z and Nismo 370Z
  • 2011 – 2013 Infiniti M37
  • 2011 – 2016 Infiniti IPL G37 Coupe
  • 2012 – present Mitsubishi Proudia 370GT
  • 2013 Infiniti IPL G37 Convertible
  • 2014 – 2016 Infiniti Q50 Coupe, Sedan, and Convertible
  • 2014 – present Infiniti Q70
  • 2014 – 2017 Infiniti QX50 and QX70

VQ37VHR Engine Problems and Reliability

Though VQ37VHR is notable for its reliability and endurance, it may have some malfunctions from time to time. Among them are:

  1. Excessive oil use.  Engine’s catalytic converters may start to function improperly if bad quality fuel is used. They are able to destroy cylinder sleeve or piston rings by generating ceramic dust. It leads to reduced compression, excessive oil and fuel use. Consequently, motor will demand repairing or exchanging. For prevention, it’s advisable to acquire high flow catalytic converter instead of upper catalytic converters. However, bear in mind that your car will become less eco-friendly.
  2. Motor overheating. This malfunction isn’t peculiar to VQ37VHR, but in some cases, it may happen. Examine radiator as well as expansion tanks of the cooling system, which may leak.

Motor’s 3 timing chains are able to run for 150,000 miles (200,000-250,000 kilometers) while valve clearance requires regulation after each 60,000 miles (90,000 kilometers) run. Minimum lifespan of VQ37VHR is 200,000 miles (300,000 kilometers).

 

VQ37VHR Engine Tuning Potential

Nissan assures that a new VQ37VHR engine is able to reach 333 hp. However, numerous tests showed the horsepower of 280 to the rear wheels. Consequently, Nissan motor loses 15% of its output. And when you have some updates in mind for this engine, take into account this number. Thus, if you wish to have 340 hp, it’s necessary to supply around 400 hp. Optimization of cold air intakes and performance chips is able to raise engine’s power to 360 hp. Clearly, it’s the maximum for naturally aspirated engines. That’s the main reason why many people opt for forced induction.

Additionally, a turbocharger is able to increase the VQ37VHR power to 500 hp, though it’s rather expensive. The Stillen supercharger kit for this motor is a Vortech V3 supercharger featuring added internals. As a result, you can reach 7 psi boos pressure and 11.5 compression index, which may help you to gain around 550 hp. By acquiring Greddy twin-turbocharger kit (2X TD06-20G), you will get approximately similar output. Take into consideration that brand’s low compression pistons and improved rods can be added as well. However, they are rather costly.

Many owners of Nissan 300Z and Infinity automobiles tune up their motors. Depending on what modifications you made, VQ37VHR has a potential of reaching about 1000 hp. Entirely built bottom and a sleeved block accompany great power rates. However, horsepower of 1000 reduces engine’s longevity as many details may break.

If money is not the issue for you, you have a chance to turn this motor into the one for races by acquiring a fresh crank, rod plus racing pistons. Very often, it’s necessary to machine the block and mount new internals. To the purpose, as VQ37VHR has been produced for a while, the selection of possible tools for updates is pretty wide.


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