Upgrading a small displacement turbocharger on a 4-cylinder engine can yield significant power gains, but choosing the right unit requires careful consideration of specs, spool characteristics, and reliability. We researched manufacturer data, owner feedback, and industry standards to compare seven popular small turbos. Our evaluation focuses on real-world performance, durability, and value to help you make an informed decision.
| Photo | Product | Score | Buy |
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Garrett GTX2860R Gen II Best Overall 60mm compressor wheel, 54mm turbine, 0.64 A/R turbine housing |
9.2 | 🛒 Check Price |
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BorgWarner EFR 6258 Best for Spool 58mm inducer, 62mm exducer compressor, 0.85 A/R turbine housing |
8.9 | 🛒 Check Price |
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Precision Turbo 5431 Gen2 Best Value 54mm compressor wheel, 31mm turbine wheel, 0.63 A/R turbine housing |
8.5 | 🛒 Check Price |
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Garrett GT3071R Multi-purpose Performer 71mm compressor wheel, 60mm turbine, 0.63 A/R turbine housing |
8.2 | 🛒 Check Price |
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BorgWarner S200SX-56 Budget Pick 56mm compressor wheel, 65mm turbine, 0.70 A/R turbine housing |
7.8 | 🛒 Check Price |
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Mitsubishi TD04HL-19T OEM Upgrade 19T compressor wheel, 49mm turbine, 0.63 A/R turbine housing |
7.5 | 🛒 Check Price |
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Holset HE221W Diesel Convert 52mm compressor wheel, 47mm turbine, 0.60 A/R turbine housing |
7.2 | 🛒 Check Price |
1. Garrett GTX2860R Gen II: Best Overall
The Garrett GTX2860R Gen II is a top-tier small turbo that delivers exceptional spool and power for 4-cylinder engines. In our evaluation based on spec sheets and owner feedback, it consistently provides strong low-end torque and a broad powerband, making it ideal for street and track use. The dual ball bearing cartridge reduces friction, allowing the turbo to spool quickly while maintaining high efficiency.
However, this performance comes at a higher cost than many journal bearing alternatives. For budget-conscious builders or those targeting only moderate gains, a less expensive option may suffice. Additionally, some owners report that the larger 0.64 A/R housing can be restrictive for high-rpm applications; consider the 0.86 A/R if you prioritize top-end power.
- Dual ball bearing cartridge for quick spool and high efficiency
- Cast turbine housing with V-band outlet for easy installation
- Proven on many 4-cylinder platforms up to 400 hp
Pros: Excellent transient response and low-end torque; Durable construction with billet compressor wheel
Cons: Premium price point compared to journal bearing units
2. BorgWarner EFR 6258: Best for Spool
The BorgWarner EFR 6258 is engineered for rapid spool and high efficiency, making it a favorite among autocross and street enthusiasts. We compared its specifications against similar units; its titanium-aluminide turbine wheel significantly reduces rotating inertia, allowing the turbo to build boost early. The integrated wastegate and blow-off valve simplify the installation process, saving time and money on additional components.
That said, the integrated design adds weight, which may be a concern for weight-optimized builds. Also, the 0.85 A/R housing can limit top-end power compared to larger housings. If you prioritize maximum horsepower over spool, consider the EFR 6758 or a Garrett GTX with a larger housing.
- Forged-machined compressor wheel for high boost and durability
- Integrated wastegate and blow-off valve for simplified plumbing
- Titanium-aluminide turbine wheel reduces inertia and spool time
Pros: Incredibly fast spool with great surge margin; Integrated components reduce installation complexity
Cons: Heavier than some competitors due to integrated wastegate
3. Precision Turbo 5431 Gen2: Best Value
The Precision Turbo 5431 Gen2 offers a compelling balance of performance and cost for those building a budget-friendly turbo setup. Based on owner feedback and spec comparisons, it provides good mid-range power and can handle daily driving stress. The journal bearing design is proven and serviceable, though it does not spool as quickly as ball bearing alternatives.
This turbo is best suited for mild upgrades where power targets are under 350 hp. For those chasing higher numbers, the limited flow capacity may become a bottleneck. Also, the 0.63 A/R housing can cause boost creep if not properly tuned. Consider a larger A/R if you plan to run high boost.
- Journal bearing design for cost savings without sacrificing reliability
- Compact size fits tight engine bays
- Supports up to 350 hp on common 4-cylinder engines
Pros: Affordable price with solid performance for mild builds; Easy to install with standard T3/T4 flange
Cons: Slower spool than ball bearing units; Limited power ceiling for high-horsepower goals
4. Garrett GT3071R: Flexible Performer
The Garrett GT3071R is a classic turbo that has powered countless 4-cylinder builds. In our research, it shows a wide powerband and good durability, thanks to its oil and water cooling. It is a adaptable choice that can work with both stock and modified engines. However, its journal bearing design and larger rotating mass mean it spools slower than the latest ball bearing turbos.
For those seeking the absolute fastest spool or highest efficiency, the GTX series or EFR are better options. The GT3071R also requires careful oil feed line setup to avoid premature bearing wear. If you are on a tight budget and want a proven performer, it remains a solid choice, but be aware of its limitations in modern builds.
- Proven on many platforms from 1.8L to 2.5L
- Oil and water cooled center section for longevity
- Available with multiple A/R options for tuning flexibility
Pros: Broad powerband with strong mid-range; Wide availability of parts and support
Cons: Older design, less efficient than newer ball bearing units; Heavy compared to modern counterparts
5. BorgWarner S200SX-56: Budget Pick
The BorgWarner S200SX-56 is a budget-friendly option for those just starting with turbo upgrades. Based on owner reports, it can deliver decent power gains when paired with proper tuning, but its journal bearing and large turbine housing result in noticeable lag. It is best suited for low-boost street setups where cost is the primary concern.
We recommend this turbo only for experienced builders who can work around its limitations. The lack of a billet compressor wheel and older design mean it is less efficient than modern units. If you can stretch your budget, the Precision 5431 Gen2 offers better performance for a modest increase in cost.
- Affordable journal bearing turbo for entry-level builds
- Simple T3 flange design fits many stock manifolds
- Supports up to 300 hp on 2.0L engines
Pros: Very low cost for the power potential; Good for low-boost applications
Cons: Slow spool and noticeable lag; Limited aftermarket support and tuning resources
6. Mitsubishi TD04HL-19T: OEM Upgrade
The Mitsubishi TD04HL-19T is a popular upgrade for those wanting a mild power increase while retaining OEM reliability. We evaluated it based on its long history in the aftermarket; it offers a straightforward installation and proven durability. However, its small frame and older design restrict its performance potential.
This turbo is not ideal for those seeking high horsepower or rapid spool. It is best for budget-conscious owners of compatible vehicles who want a reliable step up from stock. If you are building a high-performance engine, look at the Garrett or BorgWarner options instead.
- Direct bolt-on for many Mitsubishi and Subaru 4-cylinders
- Proven reliability from OEM applications
- Compact size fits easily in tight bays
Pros: Simple upgrade path with factory-like fitment; Durable construction with long service life
Cons: Limited power ceiling around 300 hp; Outdated technology compared to modern turbos
7. Holset HE221W: Diesel Convert
The Holset HE221W is a diesel-origin turbo that some enthusiasts adapt for gas 4-cylinder builds. In our research, it offers exceptional durability and can withstand high boost pressures, but its design is not tailored for gasoline engines. Spool is generally slower, and the compressor map may not match typical 4-cylinder flow requirements.
This turbo is only recommended for experienced fabricators who can custom-fit it and tune accordingly. For most users, the effort and potential for poor drivability outweigh the cost savings. We suggest skipping this unless you have specific diesel conversion goals.
- Originally designed for diesel engines, strong construction
- Oil-cooled only, simplifies plumbing
- Can be adapted to many 4-cylinder gas engines with custom work
Pros: Extremely durable and can handle high boost; Low cost if sourced from salvage
Cons: Requires custom fabrication for mounting and oil lines; Not optimized for gasoline engine spool characteristics
Frequently Asked Questions
What is the best small turbo for a 4-cylinder daily driver?
For a daily driver, the Garrett GTX2860R Gen II is an excellent choice due to its quick spool, broad powerband, and durability. It balances performance and reliability well, making it suitable for street use. The BorgWarner EFR 6258 is also a great option if you prioritize even faster spool, though it may be more expensive.
How do I choose between journal bearing and ball bearing turbos?
Ball bearing turbos like the Garrett GTX series spool faster and offer better transient response, but they cost more. Journal bearing turbos are more affordable and can be rebuilt, but they have more friction and slower spool. For a street car that sees stop-and-go traffic, ball bearing is often worth the premium. For budget builds or low-boost applications, journal bearing can be sufficient.
Can I install a small turbo on a stock 4-cylinder engine?
Yes, many small turbos like the Precision 5431 Gen2 or Mitsubishi TD04HL-19T can be used on stock engines with proper tuning and supporting mods (fuel system, intercooler). However, you must ensure the engine is in good condition and that the turbo is not oversized. Always consult a professional tuner to avoid engine damage.
What is the difference between T3 and T4 flanges?
T3 flanges are smaller and common on smaller turbos, while T4 flanges are larger and used for higher-flow units. Most small turbos for 4-cylinders use T3 or T25 flanges. The Precision 5431 Gen2 uses a standard T3 flange, making it easy to mount on many aftermarket manifolds. Check your manifold’s flange type before purchasing.
Do I need an external wastegate with these turbos?
Some turbos like the BorgWarner EFR 6258 have an integrated wastegate, simplifying setup. Others, like the Garrett GTX2860R, require an external wastegate if you want precise boost control or if the internal gate is insufficient for your power goals. For moderate boost levels, internal gates work fine; for high boost, an external gate is recommended.
Our Verdict
After comparing specifications, owner feedback, and industry reputation, the Garrett GTX2860R Gen II stands out as the best small turbo for most 4-cylinder builds, offering exceptional spool, power, and build quality. For those seeking the fastest spool possible, the BorgWarner EFR 6258 is a close runner-up with its advanced turbine technology. Both are excellent choices depending on your specific goals and budget.
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