BRZ Turbo Kit Comparison: Supercharger vs Turbo vs Twin-Screw

Stock FA20 and FA24 rods routinely snap when pushed past 300 wheel horsepower under high torque loads. Choosing between a supercharger, turbo, or twin-screw setup determines how and when that stress hits your engine.

Each forced induction option has its own distinct performance benefits and heat management drawbacks. We can help you choose the right setup for your build with a Crawford Performance engine build tailored to your power goals. Let us start with Supercharger vs Turbo vs Twin-Screw: How Each System Works, and the path begins with

Supercharger vs Turbo vs Twin-Screw: How Each System Works

Forced induction changes how your engine breathes. To make more power, you must force more air into the cylinders. This process needs a compressor. Three main systems do this on the Subaru BRZ and Toyota 86 platform. Each type uses a unique mechanical design to compress the intake charge. Before you pick a kit, you must understand how these systems make boost.

Centrifugal supercharger mechanics

A centrifugal supercharger is a belt-driven compressor. It mounts to the front of the engine. A drive belt connects the pulley to the crankshaft. As engine speed goes up, the impeller spins faster. This design makes a linear boost curve. You get small boost at low speeds, but power rises all the way to the redline. This feels like a larger stock engine. You can read our BRZ turbo kit vs supercharger guide to see how this curve compares to other setups.

Because a centrifugal kit does not make low-end torque, it is very gentle on the stock FA20 engine. The stock rods are less likely to bend because the power comes on slowly. This makes it a great choice for street cars that want safe power without a built block.

Turbocharger exhaust flow dynamics

A turbocharger does not use engine power from the crankshaft. Instead, it uses hot exhaust gas. The exhaust flow spins a turbine wheel. This turbine connects to a compressor wheel through a shaft. The compressor draws in fresh air and packs it into the engine. Because it relies on exhaust gas pressure, a turbo has some lag before boost starts. Once the turbo spools up, power rises fast. According to the Advanced Technology Institute guide on forced induction, this setup is very efficient because it uses waste heat.

Crawford Performance was the first to build a working turbo FA20 BRZ and FRS chassis. We know how to tune these engines to make safe, strong power. On the FA20 and FA24 platforms, a turbo kit offers the most peak power. It also lets you control boost with a simple controller. This makes a turbo very flexible for daily use and track days.

Twin-screw positive displacement

A twin-screw supercharger is a positive displacement pump. It sits directly on top of the engine intake manifold. Two meshing screws turn to push a fixed volume of air into the engine with every spin. Because it connects to the crankshaft by a belt, it makes boost right away.

You do not have to wait for engine speed or exhaust gas to build up. This design gives you full torque right from idle. It makes the BRZ feel like it has a much larger motor. But the intake air gets very hot because the unit sits on the hot engine block.

BRZ Turbo Kit Comparison: Choosing the Right Boost for Your FA20 or FA24

Choosing the right power adder is a major choice for any Subaru owner. When you start a BRZ turbo kit comparison, you must look at how each brand delivers power and how much the hardware costs. The stock FA20 and FA24 engines are great for handling, but they lack straight-line speed. Adding a turbocharger fixes this issue by forcing more air into the cylinders. This process improves the thermal efficiency of the motor, as shown in MIT engineering coursework. But you must choose a kit that fits your engine limits and your total build budget.

Popular Market Options: JDL, HKS, and Full Blown

There are several popular kits on the market today. The JDL kit is a popular choice among DIY builders. We recommend the GT2860RS turbocharger option for a stock motor. This small turbo spools up fast, which keeps the low-end torque safe for factory parts. For those who want a complete guide, our Subaru BRZ turbo kit guide covers this setup in detail. Another option is the HKS GT2 kit. This kit uses a high-quality cast manifold and is known for its clean fitment.

If you want a different style of build, the Full-Race and Full Blown Motorsports kits are excellent choices. The Full Blown kit offers high custom options with prices that range from $4,635 to $6,995. A base kit starts at $4,635, while a premium kit with a larger turbo can cost up to $6,995. These kits allow you to choose your own wastegate and turbo size to match your goals.

Power Limits and Supporting Mods

Your power goals will dictate which kit is best. On a stock FA20 engine, a well-tuned turbo kit can safely produce 300 to 325 wheel horsepower (WHP). This range gives you a fast street car without putting too much stress on the factory rods. If you want to compare these gains to other systems, read our BRZ turbo kit vs supercharger guide. But if you want to push past 406 WHP, a stock block will not last. You will need a built block with forged pistons and rods to handle that much boost.

Installation Complexity and Street Manners

Installing a turbo kit on a BRZ is a complex task that takes time. Most kits need you to relocate the front crash beam or trim the under tray. You must also route oil lines to and from the oil pan, which means you have to drill or tap the pan. This work is best done by an expert shop to avoid oil leaks. Once the kit is on, a proper EcuTek tune is needed to keep the car running smooth on the street. A good tune ensures the car behaves like a stock vehicle during daily drives but pulls hard under full throttle.

FA20 vs FA24: Which Engine Platform Handles Boost Better?

When you look at the two eras of the Subaru BRZ, the engine is the main change. Both engines use a flat-four layout, but they handle boost in other ways. Your choice depends on your power goals and your budget.

Stock internal limits and rod strength

The first-gen Subaru BRZ uses the 2.0-liter FA20 engine. Stock, it makes 200 horsepower but has a deep torque dip. The stock connecting rods in the FA20 are a known weak link. Tuners agree these rods can only handle boost up to about 300 wheel horsepower.

The newer BRZ and GR86 use the 2.4-liter FA24 engine. It makes 228 stock horsepower and cures the old torque dip. Subaru built the FA24 with thicker connecting rods and stronger walls to hold more boost. Many builders reach 350 to 400 wheel horsepower on these stock parts.

Here are the main stock parts to keep in mind:

• The FA20 engine size is 2.0 liters, while the FA24 engine size is 2.4 liters.
• The FA20 rods are thin and bend near 300 horsepower, but FA24 rods are thick and hold more stress.
• The FA20 uses a 12.5:1 compression ratio, while the FA24 uses a high 13.5:1 ratio.

Displacement and turbo choice

The 2.4-liter FA24 engine has 20% more displacement than the FA20. This extra size means the engine pumps out more exhaust gas to spin a turbo much faster. You can read about cylinder volume in this engine cycle guide from Michigan State. Due to this, the FA24 can spool a larger turbo with no loss of low-end torque.

With the smaller FA20, you must choose a small turbo to avoid bad lag. A large turbo on a 2.0-liter engine takes too long to spool up, making the car feel slow. Our Subaru BRZ turbo kit guide covers how to select the right turbo size. The FA24 gives you a higher boost ceiling and lets you use a wide range of sizes.

Fitment and mod differences

Adding a turbo kit to these cars needs other upgrades. The FA20 has a lower stock compression ratio of 12.5:1, while the FA24 runs a higher 13.5:1 ratio. To run high boost safely on the FA24, you must use E85 fuel or water-methanol injection. If you want to push past 400 horsepower on either engine, you will need a fully built block.

The engine bay space is also slightly distinct between the two models. Most FA20 turbo kits will not fit the FA24 chassis without changes to the piping and intercooler. The FA24 oil pan design is also distinct, which affects how oil drains from the turbo. If you plan a high-boost build, check out Crawford Performance engine builds to find the best block for your goals.

Power Delivery and Driving Feel: Track vs Street

Choosing how to boost your car shapes how it feels on the road. A proper BRZ turbo kit comparison must look beyond simple numbers on a dyno. How power builds dictates how the car behaves when you press the gas pedal. This choice decides if your car feels like a high-revving motor or a hard-hitting monster. Each system has its own power curve, response time, and thermal limits.

Instant torque versus linear power

Twin-screw systems like Harrop or Edelbrock give instant low-end torque. They use positive displacement to push air right from idle. This instant response makes them perfect for tight autocross courses. On the street, they feel punchy and quick. You get speed right away without waiting for engine speed to rise. Some twin-screw setups pass smog tests under CARB Executive Order D-215-126, which keeps them street legal.

Centrifugal superchargers act another way. They give linear power that builds with engine speed. This even flow is best for track corner exit. You can roll onto the gas without losing grip. Drivers who want a classic sports car feel often choose this path. You can read more about these systems in our BRZ supercharger kit guide.

Turbocharger lag and high-RPM rush

Turbos offer a totally new feel. A turbocharger uses exhaust gas to spin a turbine, which creates some early lag. But once boost hits, you get a massive rush of power. This surge is thrilling on the highway and makes turbos great for drag racing. It changes how the car acts.

The peak numbers highlight this power gap. A typical supercharged setup on a stock block makes about 240 wheel horsepower (WHP). In contrast, a well-tuned turbo build can push up to 406 WHP on the same engine. This peak output makes the turbo kit the top choice for straight-line speed. For a closer look at these differences, read our full BRZ turbo kit vs supercharger guide.

Best setup for track and street

Where you drive should guide your choice. Autocross courses are tight and favor the instant response of a twin-screw supercharger. Track days can suit either system based on your driving style and skill level. Street drivers who want maximum peak power often prefer a turbo kit. Think about where you will spend most of your time behind the wheel.

No matter the boost type, safety and rules are key. High-power street cars must meet emissions rules, which you can read about on the EPA enforcement site. Adding power also stresses stock parts, so keeping your engine healthy is key. Be sure to read about BRZ oil starvation prevention before you hit the track.

Heat Management and Supporting Mods for Your BRZ Build

Thermal Limits of the BRZ Platform

Adding boost to a Subaru BRZ changes how the car handles heat. The stock engine bay has poor airflow, so heat control is your first job. When you install a BRZ turbo kit vs supercharger guide, both water and oil temps will rise fast under load. You must fix these heat issues to protect your motor from bad failures.

High oil temps can thin out your motor oil and wear down inner parts. Research on charge air cooling from MIT shows that cool air is needed to keep density high and stop knock. Managing heat is not just about power; it is about keeping your motor alive.

Essential Step-by-Step Installation Sequence

To build a reliable boosted BRZ, you should install your parts in a clear order. This plan helps you manage heat and power step by step. Following these steps will keep your engine running strong.

1. Mount the oil cooler and intercooler. An oil cooler keeps oil in its safe range, while an intercooler lowers intake air temps. Choose a front-mount intercooler (FMIC) for the most cooling on a turbo build, or a top-mount (TMIC) if space is tight. Both options help prevent heat soak during track runs.
2. Install an air-oil separator. High crankcase pressure in boosted motors causes oil blow-by that lowers octane. A Crawford Performance air-oil separator (AOS) stops this oil from coating your intake to keep the system clean. This step is key for BRZ oil starvation prevention.
3. Upgrade the clutch. The stock BRZ clutch cannot hold more than 300 wheel horsepower (WHP) for long. You should swap the factory clutch for an aftermarket unit rated to hold your new torque target before you run the car on the dyno. This upgrade is critical to avoid clutch slip under boost.
4. Fit the fuel system components. To support more air, you need more fuel. Install larger fuel injectors and a high-flow fuel pump to prevent the lean runs that destroy stock pistons. Correct fueling is the backbone of any safe power build.

Fuel and Engine Management Requirements

The stock fuel parts and computer cannot handle the needs of a boosted build. Once your parts are in place, you must upgrade the fueling and software. Using Crawford Performance fuel system parts ensures good fuel flow to the engine under high boost.

The final step is always an expert ECU tune. Software like EcuTek or COBB lets your tuner adjust timing, fuel tables, and cam angles. Never run the car hard on a base map, as a custom dyno tune is the only way to keep your engine safe.

When Do You Need a Built Engine for Your Boosted BRZ?

When you start a BRZ turbo kit comparison, you must look at the limits of your stock engine block. Adding boost creates high pressure that can quickly push factory parts past their breaking point. The stock FA20 engine has a square piston layout with identical bore and stroke, as shown in Subaru FA20 engine specifications. This flat boxer engine sits low to improve handling, which makes the chassis highly responsive. But when you add a large turbocharger, the stock internals face loads they were never designed to handle.

Limits of the Stock FA20 and FA24 Blocks

On the older FA20 engine, stock parts are safe up to about 300 wheel horsepower. On the newer FA24 engine, the limit is slightly higher because of its larger size. If you stay below these power levels, a basic bolt-on kit will run well on a safe tune. But pushing past these limits on stock pistons and rods is a major risk.

The most common cause of engine failure under high boost is rod bend or breakage. When a rod bends, it can ruin the engine block instantly. High heat and pressure can also cause the stock pistons to crack, especially around the ring lands. To prevent these failures and avoid major damage, you should also look into BRZ oil starvation prevention methods before pushing high power.

Upgrading Key Internal Components

A built engine starts with high-strength forged pistons and heavy-duty rods. Forged pistons are typically made from either 4032 or 2618 aluminum alloy. The 4032 alloy has more silicon, which means it expands less under heat and runs quieter. The 2618 alloy is stronger and handles extreme boost, but it expands more and can be noisy when cold. For high-boost builds, you will also need strong rods from trusted brands like Manley or CP-Carrillo.

Along with pistons and rods, upgrading your engine bearings is vital to keep your oil film intact. Performance bearings from King or ACL help prevent spun bearings under heavy loads. You should also use high-strength ARP head studs to prevent the cylinder head from lifting under high boost. These parts work together to make sure your engine block can handle the extra stress of a powerful turbocharger setup.

Selecting a Built Short Block

If you do not want to build your own engine from scratch, buying a pre-built short block is a great option. For example, an IAG Stage 2 short block costs about $4,000 to $6,000 and can safely handle up to 550 wheel horsepower. If you want to push further, an IAG Stage 3 block costs about $8,000 to $10,000 and can support 700 or more horsepower. These options give you a proven foundation without the hassle of measuring tolerances yourself.

Crawford Performance is an authorized IAG dealer, and we specialize in custom short block and long block engine builds. We can help you choose the right internals for your specific goals, ensuring your car stays reliable on the street and track. Explore our full range of Crawford Performance engine builds to find the perfect foundation for your boosted BRZ.

How Much Does a BRZ Turbo Kit Cost? Total Build Budget

Adding forced induction to your car is more than just buying a main kit. You must plan for supporting parts, labor, and tuning. The factory engine is built to sit low to reduce the polar moment of the chassis and keep handling sharp. To protect this balance under boost, you need to budget for the entire build from the start.

Forced induction hardware costs

The first major cost is the power adder itself. A BRZ turbo kit can run from $3,000 to $7,000 depending on the brand. If you prefer a supercharger, a kit from Harrop or Edelbrock costs between $4,000 and $6,000. Each path has unique hardware needs, which is why a thorough BRZ turbo kit vs supercharger guide is helpful before you buy.

Supporting parts and professional labor

You cannot just bolt on a turbo and drive. A safe street setup needs supporting parts. You must upgrade the clutch, fuel pump, injectors, and oil cooling, which can add $1,500 to $4,000. This budget also includes crucial parts like an air-oil separator to prevent engine damage. Labor from an expert shop to install these parts ranges from $1,000 to $3,000. You also need a custom tune via EcuTek or COBB, which costs between $500 and $1,000 to keep the engine safe.

If you want to push past 300 horsepower, the stock engine internals may fail. In this case, you will need a stronger base. Upgrading to Crawford Performance engine builds is a smart move. This can range from $2,000 for a short block to $10,000 or more for an IAG Stage 3 long block. A built motor can handle high boost safely for years.

Total budget tiers by performance

To help with your BRZ turbo kit comparison, we broke down the total costs into three build tiers. These numbers show what you will spend to finish your project. Review the details below to see which path fits your goals and wallet.

Frequently Asked Questions

Is it worth turboing a BRZ?

Adding a turbo to your BRZ is worth it if you want to fix the lack of straight-line power. A quality turbo kit can easily push your car past 300 horsepower. This changes how the car drives without losing its great handling. To find out more, read our BRZ turbo kit vs supercharger guide to see which option fits your driving goals.

Is it better to supercharge or turbo a BRZ?

The best choice depends on how you want the car to feel. A supercharger gives you instant throttle response and a smooth, linear power curve that feels like a larger stock engine. A turbocharger has more lag but delivers a much stronger rush of top-end power. For a deep look at supercharging, read our BRZ supercharger kit guide to see if it fits your build.

How much horsepower does a turbo add to a BRZ?

A quality turbo kit can add 100 to 125 horsepower on a stock engine. This typically brings the total power up to 300 or 325 wheel horsepower with a safe tune. If you want more power, built engine internals can push the FA20 or FA24 past 400 horsepower. Check out our Subaru BRZ turbo kit guide to compare different kits.

Can a stock FA20 handle boost?

Yes, a stock FA20 engine can handle moderate boost levels safely. Most tuners agree that the stock rods and pistons are safe up to about 300 wheel horsepower. Exceeding this limit increases the risk of engine failure. If you plan to run higher boost, we highly recommend upgrading to Crawford Performance engine builds to ensure your motor can handle the extra stress.

What supporting mods are needed for a BRZ turbo kit?

To run a turbo kit safely, you need supporting upgrades. These include a high-flow fuel pump, larger injectors, a stronger clutch, and an upgraded oil cooler. An oil separator is also vital to keep your intake tract clean. You should read our BRZ oil starvation prevention guide to learn how to keep your engine healthy under boost.

Ready to start your Subaru BRZ forced induction engine build?

Delaying your forced induction project means you risk running a poorly matched setup that can cause major engine failure and cost you thousands of dollars. Starting your build today lets you secure your performance parts and select the right Crawford Performance engine builds to keep your motor safe and strong. Waiting too long will only push your shop build timeline back, so do not let another track day pass without the strong power you want.

Ready to boost your Subaru BRZ? Call (859) 394-4248 to schedule a consultation for your BRZ forced induction build and secure your build slot today. Our team is ready to help you plan a fast, safe, and powerful build.