FB24 Subaru FB24

Модульний 4-циліндровий двигун з турбонаддувом, що забезпечує високу потужність та ефективність.

Brand: Subaru Type: Petrol Configuration: Flat-4 Production Years: 2012 - теперішній час Production: Gunma, Japan
27 Brand engines
9 Modifications

Technical Specifications

Engine Displacement 2.4 L (2,400 cc)
Configuration Flat-4
Number of Cylinders 4
Valves per Cylinder 4
Power 173 - 250 л.с.
Torque 235 - 350 Н*м
Cylinder Bore 92.00 mm
Piston Stroke 90.00 mm
Compression Ratio 10.5:1
Firing Order 1-3-2-4
Fuel System Multi-point Fuel Injection
Aspiration Naturally Aspirated
Turbocharger Single Twin-Scroll Turbo
Intercooler No
Maximum RPM 6,000 rpm
Max Torque RPM 4,000 rpm
Valve Train DOHC
Timing Drive Chain
Timing Chain Replacement 200000 or as needed
Block Material Aluminum
Head Material Aluminum
Engine Weight 150 kg
Dimensions (L×W×H) 600 × 600 × 700 mm
Lubrication System Wet sump
Cooling System Liquid cooling

Additional Information

Engine Family Subaru FB engine series
Manufacturing Plant Gunma, Japan
Predecessor EJ25

Maintenance

Engine Oil Capacity 5.5 L (with filter: 6 L)
Recommended Viscosity 0W-20, 5W-30
Oil Standard API SN, ILSAC GF-5
Recommended Brands Subaru Genuine Oil, Mobil 1, Castrol Edge
Oil Change Interval 10 000 km or 6 mo
Oil Filter 15208AA12A
Air Filter 16546AA12A
Replace every 30 000 km
Spark Plugs Type: Iridium
Part number: 22401AA640
Gap: 1.1 mm
Quantity: 4 pcs
Replace every 60 000 km
Coolant Capacity 8 L
Coolant Type Subaru Coolant (Subaru Genuine Coolant)
Coolant Change Interval 240 000 km
Thermostat Opening Temperature 90°C
Operating Temperature 90°C
Max Operating Temperature 120°C
Critical Temperature 130°C
Annual Maintenance Cost 600-900 USD

Reliability

Reliability rating: 8/10

Expected lifespan: 300 000 km

Common problems

Problem Severity Mileage Repair cost
Oil consumption issues Medium 100000-150000 km $500-1000
Head gasket failure High 150000-200000 km $1500-2500

Known defects

  • Some early models had issues with valve cover gaskets
  • Potential for engine knock under heavy load

Warranty extensions

  • Subaru offers extended warranty options for certain models

Tuning potential

Tuning potential: Medium | Max. safe power: 350 hp

Stage Power Torque Method Cost
Stage 1 210 hp 400 Nm ECU remap only
Reliability impact: Minimal 		$600
Stage 2 250 hp 450 Nm ECU, Downpipe, Intake
Required: Upgraded exhaust, ECU remap
Reliability impact: Low 		$1500
Stage 3 300 hp 500 Nm -
Required: Turbocharger kit, Upgraded fuel system
Reliability impact: Medium 		$4000

Popular modifications

  • ECU tune (Stage 1)
  • Cold air intake
  • Cat-back exhaust system

Tuning limitations

  • Stock internals may limit power above 300hp
  • Cooling system upgrades recommended for high power builds

Cars with the FB24 engine

This engine was fitted to 3 models

Photo Brand Model Generation Production years
No photo
 Subaru Ascent Ascent 2018 - present
No photo
 Subaru Forester Forester VI (SL) 2024 - present
No photo
 Subaru Outback Outback VI 2020 - present

All modifications (9)

Vehicle Generation Modification Power Gearbox Drive
Subaru Ascent Ascent 2.4L Turbo 260 л.с. CVT 4x4 260 hp CVT 4x4
Subaru Ascent Ascent 2.4L Turbo 260 л.с. 6-МКП 4x4 260 hp 6-МКП 4x4
Subaru Ascent Ascent 2.4L Turbo 260 л.с. CVT 2WD 260 hp CVT 2WD
Subaru Forester Forester VI (SL) 2.4L Turbo Boxer 260 л.с. 6-МКП 2WD 260 hp 6-МКП 2WD
Subaru Forester Forester VI (SL) 2.4L Turbo Boxer 260 л.с. CVT 2WD 260 hp CVT 2WD
Subaru Forester Forester VI (SL) 2.4L Turbo Boxer 260 л.с. 6-МКП 4x4 260 hp 6-МКП 4x4
Subaru Forester Forester VI (SL) 2.4L Turbo Boxer 260 л.с. CVT 4x4 260 hp CVT 4x4
Subaru Outback Outback VI 2.4 Turbo 260 л.с. CVT 4x4 260 hp CVT 4x4
Subaru Outback Outback VI 2.4 Turbo 260 л.с. 6-МКП 4x4 260 hp 6-МКП 4x4

Interesting Facts

  • The FB24 engine is part of Subaru's new generation of engines designed for better fuel efficiency.
  • It features a horizontally opposed design, which lowers the center of gravity.

Applications

Vehicle Generation Years Power Markets
Subaru Outback 5th 2012-present 173hp/250hp Global
Subaru Legacy 6th 2012-present 173hp/250hp Global

Compatible transmissions: CVT, 6-speed Manual

Drive types: AWD

Fuel Economy

Fuel Type Petrol 95
Octane Rating Minimum: 91 | Recommended: 95
Consumption (City) 10.5 L/100km
Consumption (Highway) 7.5 L/100km
Consumption (Combined) 9 L/100km
Real Consumption 8.8 L/100km
Fuel Tank Capacity 60 L
Range 670 km
Cost per 100 km 10-12 USD

Emissions Standards

Emission Standard Euro 6
CO₂ Emissions 180 g/km
Particulate Filter (DPF) Absent
AdBlue Not Required

Comparison with competitors

Engine Brand Displacement Power Torque
K24 Honda 2,400 cc 190 hp 240 Nm
2.5L I4 Toyota 2,500 cc 203 hp 250 Nm

Pros

  • Lower center of gravity due to flat engine design
  • Good balance of power and fuel efficiency

Cons

  • Potential oil consumption issues
  • Higher maintenance costs compared to some competitors