When you hear “JDM performance,” engines like the 2JZ-GTE, RB26DETT, and EJ20 often steal the spotlight. They’re icons — and for good reason. But behind those legends lies a range of underrated Japanese engines that quietly deliver exceptional performance, reliability, and tuning potential. These powerplants might not get movie-level fame, but they’ve earned the respect of mechanics, tuners, and smart enthusiasts who know what to look for.
Here’s a look at some underrated JDM engines that perform far better than most drivers expect — and why you might want to consider them for your next import.
1. Honda F20B — The Shadow of the S2000’s F20C
Most car fans know the high-revving F20C from the Honda S2000, but its sibling, the F20B, rarely gets the same recognition. Found in the Accord SiR and Torneo SiR, the F20B shares much of the same DNA — it’s a 2.0L DOHC VTEC engine that revs past 8,000 rpm, produces around 200 horsepower, and offers buttery-smooth response.
Why it’s underrated:
The F20B is often overlooked because it wasn’t in a pure sports car. Yet it offers incredible tuning potential and can handle turbocharging if built properly. For those seeking a cheaper alternative to the F20C without losing that Honda VTEC thrill, this engine is a hidden gem.
2. Toyota 1ZZ-FE — The Reliable Performer
Overshadowed by Toyota’s more famous 4A-GE and 2ZZ-GE engines, the 1ZZ-FE was designed for efficiency, not excitement. Yet, under the hood of cars like the Celica, MR-S, and Corolla Sportivo, this lightweight all-aluminum engine can surprise you.
Why it’s underrated:
The 1ZZ-FE has a strong mid-range torque curve, and when combined with a lightweight chassis, it delivers responsive and enjoyable driving. Tuners have proven that, with proper ECU tuning or mild forced induction, it can produce respectable power while maintaining Toyota’s legendary reliability. It’s a brilliant daily-driver engine that can still make you grin.
3. Nissan SR20VE — The VTEC of Nissan
Everyone loves the SR20DET, but fewer talk about the SR20VE, Nissan’s naturally aspirated masterpiece. Found in the Primera, Bluebird, and later Pulsar models, it features Nissan’s NEO VVL system — their answer to Honda’s VTEC.
Why it’s underrated:
The SR20VE is a rev-happy 2.0L that delivers strong power without the complexity of a turbo setup. It makes around 190–200 hp stock, and with bolt-ons or ECU tuning, can exceed 220 hp. Tuners love how well it responds to breathing mods and cam upgrades. If you want old-school reliability with modern tech, the SR20VE is a sleeper choice that outperforms expectations.
4. Mazda BP-Z3 — The Heart of the MX-5 NB
Mazda’s BP engine family has always been solid, but the BP-Z3 variant — fitted in the MX-5 NB and Familia GT — is particularly impressive. It might not boast big turbo numbers, but its balance, smoothness, and responsiveness make it a joy to drive.
Why it’s underrated:
This 1.8L engine delivers 140–160 hp naturally aspirated, but its true magic is in its linear throttle feel and lightweight build. With upgraded internals, it’s been known to handle turbo kits producing 250+ hp reliably. Many JDM enthusiasts underestimate just how versatile the BP-Z3 can be, especially for track and drift builds.
5. Subaru EJ204 — The Quiet Boxer Hero
While the turbocharged EJ20 and EJ25 dominate Subaru conversations, the EJ204 (found in Japanese-market Legacy and Impreza models) is an unsung hero. It’s a 2.0L DOHC boxer engine with variable valve timing — and it’s surprisingly punchy for a naturally aspirated setup.
Why it’s underrated:
The EJ204 delivers 165–180 hp with excellent throttle response and a smooth power band. Unlike its turbo siblings, it’s simpler, lighter, and more efficient — ideal for drivers who want Subaru’s boxer feel without the high maintenance of turbo models. It’s perfect for daily driving, offering reliability and distinctive sound in equal measure.
6. Mitsubishi 4G93T — The Hidden Boost Monster
Everyone talks about the 4G63T from the Evo, but few realize that the 4G93T, a smaller 1.8L turbocharged engine used in the Lancer GSR and Mirage Asti, is a formidable performer.
Why it’s underrated:
It may be smaller in displacement, but with its factory turbo setup, the 4G93T produces around 200 hp stock and responds beautifully to upgrades. Lighter than the 4G63, it gives cars sharper front-end handling and better weight distribution. It’s a perfect example of Mitsubishi engineering that combines power, agility, and boost potential in a compact package.
7. Toyota 3S-GE BEAMS — Precision from Lexus and Altezza
Before the 2ZZ and FA-series engines, Toyota created the 3S-GE BEAMS, found in the Altezza RS200 and Celica SS-II. Co-developed with Yamaha, it features Variable Valve Timing and Lift (VVTL-i) and produces up to 210 hp from a 2.0L naturally aspirated four-cylinder.
Why it’s underrated:
The BEAMS engine delivers an exhilarating top-end pull and is remarkably responsive to tuning. It’s robust, high-revving, and beautifully engineered — often described as “Japan’s answer to the BMW inline-four.” Despite that, it remains affordable and widely available from Japanese importers.
8. Nissan VQ30DE — The Smooth Operator
Part of Nissan’s long-running VQ family, the VQ30DE is often ignored because of its presence in sedans like the Cefiro, Maxima, and Stagea. Yet it’s one of the smoothest and most balanced V6 engines of its era.
Why it’s underrated:
The VQ30DE makes 220–230 hp, delivers a silky powerband, and has legendary reliability. It also handles turbocharging surprisingly well — some tuners push them past 350 hp on stock internals. If you’re after refined power with sleeper potential, this engine is a bargain powerhouse.
Final Thoughts: Power Isn’t Always About Fame
The JDM world is filled with legends — engines that dominate YouTube builds and dyno charts. But the ones above prove that you don’t need a 2JZ or RB26 to have fun, go fast, or build something unique. From Honda’s high-rev screamers to Nissan’s VVL innovators, these underrated engines deliver outstanding performance, reliability, and personality at a fraction of the cost.
For Australian buyers and import enthusiasts, these engines also represent smart investment opportunities. Many are easier to maintain, simpler to register, and far cheaper to import — making them ideal for practical enthusiasts or first-time JDM owners.
So next time you’re browsing imports at Tokyo Drive, don’t just look for the usual legends. Keep an eye out for the quiet performers — the ones with unassuming badges but big potential. You might just find your next JDM sleeper waiting to surprise you.
