Nissan VG30ET

Nissan VG30ETThe Nissan VG30ET is turbocharged a 3.0 l (2,960 cc, 180.62 V6 60° straight-four, four-stroke cycle gasoline engine from Nissan VG-family.

The VG30ET features cast-iron block and two aluminum heads with single overhead camshafts (SOHC) and two valves per cylinder. The Nissan VG30ET engine is equipped with multi-point fuel injection and mechanically timed electrical ignition system with a single ignition coil and mechanical distributor. Until 1987 the engine used Garrett T3 turbocharger (6.8 psi; 0.47 bar) since 1988 model year the VG30ET used Garrett T25 (4.5 psi; 0.31 bar) to reduce turbo lag.

Cylinder bore and the piston stroke are 87.0 mm (3.43 in) and 83.0 mm (3.27 in), respectively. The early version has a compression ratio rating 7.8:1, since 1988 the compression ratio was increased to 8.3:1. The produced from 203 PS (149 kW; 200 HP) of maximum horsepower for JDM and USDM to 234 PS (172 kW; 230 HP) for the European market and from 308 Nm (31.42 kg·m; 227.3 ft·lb) to 342 Nm (34.88 kg·m; 252.4 ft·lb) of torque, respectively. On April 1987 the “W” series VG30 was released, and the output power was increased to 208 PS (153 kW; 205 HP).

The breakdown of the engine code is as follows:

  • VG – Engine Family
  • 30 – 3.0 Liter Displacement
  • E – Multi Point Fuel Injection
  • T – Turbocharged

General information

Engine Specifications
Engine codeVG30ET
LayoutFour stroke, V6
Fuel typeGasoline (petrol)
Displacement3.0L, 2,960 cc (180.62 cu in)
Fuel systemMulti Point Fuel Injection
Power adderGarrett T3, Garrett T25
Power output 195 PS (143 kW; 192 HP) at 5,200 rpm
203 PS (149 kW; 200 HP) at 5,200 rpm
208 PS (153 kW; 205 HP) at 5,200 rpm
234 PS (172 kW; 230 HP) at 5,200 rpm
Torque output 308 Nm (31.42 kg·m; 227.3 ft·lb)
342 Nm (34.88 kg·m; 252.4 ft·lb)
Firing order1-2-3-4-5-6
Dimensions (L x W x H):
Weight~ 220 kg (485 lbs)

Cylinder block

The VG30ET has a cast-iron block with a four-bearings crankshaft supported system. The cylinder bore is 87.0 mm (3.43 in), piston stroke is 83.0 mm (3.27 in). The Nissan VG30ET motor has two compression and one oil control rings. The connecting rod center distance is 154.10 mm (6.0669 in). The crankshaft main journal diameter is 62.9 mm (2.48 in) and crankpin diameter is 49.9 mm (1.97 in), center distance is 41.5 mm (1.63 mm).

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:7.8:1 or 8.3:1
Cylinder bore:87.0 mm (3.43 in)
Piston stroke:83.0 mm (3.27 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:4
Cylinder inner diameter (standard):87.000-87.010 mm (3.4252-3.4256 in)
Piston skirt diameter (standard):86.967-86.975 mm (3.4238-3.4242 in)
Piston pin outer diameter:20.993-20.998 mm (0.8265-0.8267 in)
Piston ring side clearance:Top0.040-0.073 mm (0.0016-0.0029 in)
Second0.030-0.063 mm (0.0012-0.0025 in)
Piston ring end gap:Top0.21-0.44 mm (0.0083-0.0173 in)
Second0.18-0.44 mm (0.0083-0.0173 in)
Oil0.20-0.72 mm (0.0079-0.0299 in)
Connecting rod small end diameter:20.958-20.971 mm (0.8251-0.8256 in)
Connecting rod center distance:154.1-154.2 mm (6.067-6.071 in)
Crankshaft main journal diameter:62.975 mm (2.4763 in)
Crankpin diameter:49.974 mm (1.9675 in)
Crankshaft center distance:41.47-41.53 mm (1.6327-1.6350 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 90-100 Nm; 9.2-10.2 kg·m; 67-74 ft·lb in two-three stages

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing nut

  • Step 1: 14-16 Nm; 1.4-1.6 kg·m; 10-12 ft·lb
  • Step 2: Turn nuts 60-65° or 59-65 Nm; 6.0-6.6 kg·m; 43-48 ft·lb

Crankshaft pulley bolt

  • 123-132 Nm; 12.5-13.5 kg·m; 90-98 ft·lb

Flywheel (M/T) or Drive plate (A/T) fixing bolts

  • 83-93 Nm; 8.5-9.5 kg·m; 61-69 ft·lb

Cylinder head

The cylinder head is made of strong, light aluminum alloy which gives it good cooling efficiency. The has single overhead camshaft for each head and rocker shaft with rocker arms. The camshafts are driven by a single timing belt.

The intake valve diameter is 42.0 mm (1.65 in), the exhaust valve diameter is 35.0 mm (1.38 in), the duration is 252° for both side. The “W” series has 248° duration for both sides. The VG30ET is equipped with a hydraulic lash adjuster. Each valve uses dual valve springs.

Cylinder head
Block head alloyAluminium
Valve Arrangement:SOHC, belt drive
Head surface flatnessLess than 0.05 mm (0.002 in)
Valves:12 (2 valves per cylinder)
Intake valve timing252°
“W” – 248°
Exhaust valve timing:252°
“W” – 248°
Valve head diameter:INTAKE42.0-42.2 mm (1.654-1.661 in)
EXHAUST35.0-35.2 mm (1.378-1.386 in)
Valve length:INTAKE125.3-125.9 mm (4.93-4.96 in)
EXHAUST124.2-124.8 mm (4.89-4.91 in)
Valve stem diameter:INTAKE6.965-6.980 mm (0.2743-0.2748 in)
EXHAUST7.945-7.960 mm (0.3128-0.3134 in)
Valve spring free length:OUTER51.2 mm (2.016 in)
INNER44.9 mm (1.768 in)
Camshaft cam height:INTAKE 39.607-39.657 mm (1.5593-1.5613 in)
39.537-39.727 mm (1.5566-1.5641 in)
EXHAUST 39.607-39.657 mm (1.5593-1.5613 in)
39.537-39.727 mm (1.5566-1.5641 in)
Camshaft journal diameter:46.935-46.955 mm (1.8478-1.8486 in)

Head tightening procedure and torque specs:

  • Step 1: 39 Nm; 4.0 kg·m; 29 ft·lb
  • Step 2: 123 Nm; 12.5 kg·m; 90 ft·lb
  • Step 3: Loosen all bolts completely
  • Step 4: 34-44 kg·m; 3.5-4.5 kg·m; 25-33 ft·lb
  • Step 5: Turn all bolts 65-70° or to 123 Nm; 12.5 kg·m; 90 ft·lb

Camshaft sprocket bolts

  • 78-88 Nm; 8.0-9.0 kg·m; 58-65 ft·lb

Maintenance data

Compression pressure
Standard11.9 kg/m2 (169 psi) / 300 rpm
Minimun8.8 kg/m2 (125 psi) / 300 rpm
Compression differential limit between cylinders1.0 kg/m2 (15 psi) / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 10W-30, 10W-40, 20W-40, 20W-50
Oil type APIAPI SF
Engine oil capacity (Refill capacity) With filter change 4.0 l (4-1/4 Us. qt., 3-1/2 Imp. qt)
Without filter change 3.3 l (3-1/2 Us. qt., 2-7/8 Imp. qt.)
Oil change interval, km (miles)Every 12,000 (7,500)
Ignition system
Spark plug Standard type: NGK BCPR6E-11
Hot type: BCPR5E-11
Cold type: BCPR7E-11
Spark plug gap1.0-1.1 mm (0.039-0.043 in)

Vehicle applications

ModelYears Produced
Nissan 300ZX Turbo (Z31)1984–1989
Nissan Leopard
Nissan Gloria (Y30, Y31)
Nissan Cedric (Y30, Y31)
Nissan GTP ZX-Turbo Racecar
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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