While some unreliable cars are worth the headache, reliability is always an important factor for most buyers. This is especially important when it comes to turbocharged engines. They’re known for their performance and tuning potential, but don’t have the best reputation when it comes to reliability, mostly due to their high operating temperatures and complex construction. But there are exceptions to this generalization, and a handful of turbocharged engines offer both reliability and performance. Most of these engines come from Japanese automakers, although the Germans also know a thing or two about building reliable turbocharged cars. Some of the most reliable turbocharged engines include Honda’s K20C1, Porsche’s 3.0-liter twin-turbo flat-six, and Volkswagen’s EA888. They are suitable for new cars such as the Honda Civic Type R, Porsche 911 Carrera S and Volkswagen Golf R. In addition, there are engines such as 2JZ-GTE and RB26DETT. They’re no longer produced – having been used in cars such as the Toyota Supra Mark IV and Nissan Skyline R32, R33 and R34 GT-R – but remain popular on the second-hand market.
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Honda K20C1
K20C1 engine in Honda Civic Type R – Andriy Baidak/Shutterstock
The Honda K20C1 is a 2.0-liter turbocharged inline four-cylinder engine found in cars such as the Honda Civic Type R, Acura Integra Type S, and even the Ariel Atom. It also serves as a crate engine for racing teams.
The engine features an aluminum cylinder block with a forged steel crankshaft, reinforced connecting rods and pistons to withstand sustained high boost pressures. It uses a single-scroll turbocharger and produces 306 horsepower and 295 pound-feet of torque in stock form. One cool approach is to use a sodium-filled exhaust valve, which helps lower the exhaust temperature. Another is an offset crankshaft, which reduces engine wear and thrust loads on the cylinder walls. The Honda K20C1’s integrated exhaust manifold helps reduce turbo lag and manage heat. It’s backed by a high-flow cooling system, low maintenance, and many owners vouch for its reliability. With regular oil changes and basic maintenance, it easily spans 100,000 miles, remains reliable with minor performance upgrades, and can handle big power outputs—there are examples of tuners pushing 1,200 horsepower on the stock engine block.
Porsche 9A2
Porsche 911 Turbo S – Sjoerd Van Der Wal/Getty Images
While Porsche does have a reliable and legendary turbo engine in the form of the Mezger twin-turbocharger, in the context of modern Porsche, that title belongs to the 3.0-liter flat-six turbocharged engine in the 911.2-generation Carrera and Carrera GTS as well as the current 992 model (known internally as the 9A2). This engine makes the 911 one of the most reliable high-performance sports cars. It’s also one of the driving forces behind Porsche’s key shift from the 911’s naturally aspirated engines to turbocharged engines.
The reason the 3.0 flat-six turbocharged engine is so reliable is because it was completely redesigned to accommodate turbocharging, rather than being reworked from an old engine layout. It features an aluminum cylinder block with a closed-deck design that provides superior rigidity and prevents cylinder deformation under high boost pressure. The Porsche 9A2 engine has a strong reputation among enthusiasts, and owners alike praise its durability and reliability when properly maintained.
Volkswagen EA888
Volkswagen EA888 engine in Golf GTI – Andriy Baidak/Shutterstock
The latest version of the EA888 is powered by a 2.0-liter inline four-cylinder engine found in the Volkswagen Group’s Golf GTI, Audi A3, S3 and A4, as well as numerous Skoda and Seat models. The 1st and 2nd generation EA888 had fuel consumption issues (due to faulty piston ring design) and timing chain failure. Both issues were addressed in the third-generation engine.
The reliability of the third-generation engine comes from its solid cast-iron enclosed engine block and aluminum cylinder head that features an integrated exhaust manifold for improved efficiency. The engine uses direct injection technology, which can cause carbon buildup over time. To control this, Volkswagen introduced dual injection (direct injection and port injection), where the port injector injects fuel onto the intake valve to keep it clean. Variable valve timing and valve lift technology helps the turbocharger start up faster and works with the injection system to provide efficient combustion at different loads.
With proper care, the EA888 can easily last 200,000 miles—impressive for a stock engine that puts out 200 to 300 horsepower. As for tunability, you can get significant performance gains with minimal impact on reliability with simple first-stage adjustments.
Toyota 2JZ-GTE
2JZ Engine – Adrian Chylaszek/Shutterstock
The 2JZ-GTE – the iconic engine behind the “Is that a Supra?” meme – is the stuff of automotive legend. If you were to make a list of indestructible engines, this 3.0-liter twin-turbocharged inline-six would probably be near the top. Built in the 1990s, the 2JZ was developed to handle more than stock production and was used in the Toyota Supra Mark IV from 1993 to 2002. It also appears under the hood of Japanese Domestic Market (JDM) cars such as the Toyota Aristo.
The secret to the 2JZ-GTE’s famed reliability lies in its cast-iron block, which provides superior structural rigidity and thermal stability—essential traits for handling high turbocharger pressures. The engine was also severely over-engineered, using seven main bearings to support a forged steel crankshaft and forged steel connecting rods. It even features a closed deck design, which not only provides additional reinforcement to the cylinder, but also reduces the likelihood of head gasket failure under high boost pressure.
With precise Japanese tolerances and a carefully engineered lubrication and cooling system, the 2JZ-GTE has more than 300,000 miles on the clock. The engine is engineered so well that tuners can boost its power to 700 horsepower with basic bolt-on upgrades.
Nissan RB26DETT
RB26DETT engine in Skyline GT-R – Art Konovalov/Shutterstock
Nissan’s answer to the 2JZ is the RB26DETT, which is equally well designed and offers tremendous durability and tuning potential. The 2.6-liter twin-turbocharged inline-six engine was the signature engine of the 1990s Nissan Skyline GT-R models (R32, R33 and R34) and also appears in the Nissan Stagea 260RS. The engine was developed to meet homologation requirements for the Group A Touring Car Championship, which meant it was over-engineered for its 276-horsepower rating under Japan’s gentleman’s agreement.
The RB26DETT engine combined with Nissan’s advanced All-Terrain Electronic Torque Split Total Traction Engineering System (ATTESA E-TS) all-wheel drive unit helped the Skyline GT-R dominate the Touring Car Championship and earn the famous “Godzilla” nickname. In fact, the Nissan GT-R was so dominant that the Australian Touring Car Championship series actually banned them from racing.
The RB26DETT’s bulletproof properties come from its cast iron cylinder block. It uses an ultra-square layout with an 86mm bore and 73.7mm stroke, ensuring a higher rev limit. You can double the power output without sacrificing reliability, making the RB26DETT one of the most reliable and tuneable engines for making crazy horsepower.
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