BorgWarner S300 vs S400 vs S480: Which Turbocharger for Your Application?

If you’re spec’ing a turbo for a diesel build or a fleet repower, the BorgWarner S300 vs S400 vs S480 question comes up on nearly every desk. These three frame sizes cover the vast majority of medium and heavy-duty diesel applications on the road today, from a 5.9L Cummins to a 15L Detroit, and picking the wrong one costs you drive pressure, spool time, or top-end power. After 45+ years building and rebuilding turbos, we’ve matched thousands of these units to real engines. Here’s how the S300, S400, and S480 actually stack up, and which one belongs on your application.

BorgWarner S-Series: What the Numbers Actually Mean

The S-Series naming refers to frame size, which dictates the compressor and turbine wheel range that fits inside the housing. Bigger frame equals bigger airflow ceiling, but also more rotating mass and later spool. The trick is matching the frame to your displacement and horsepower target so you get responsive boost without choking the top end.

• S300 (S3 frame): Compressor inducers roughly 57mm to 72mm, rated by BorgWarner from about 320 to 1,000 horsepower. The go-to upgrade for 5.9L/6.7L Cummins builds, and the factory frame on International DT466 and John Deere 6068 engines.
• S400 (S4 frame): Compressor inducers roughly 67mm to 88mm, rated by BorgWarner from about 400 to over 1,500 horsepower. The workhorse for 10L to 15L on-highway engines and moderate performance builds.
• S480 (S4 frame, 80mm): A large member of the S400 family, specifically the 80mm compressor inducer. Built for roughly 750 to 1,250 horsepower drag, sled pull, and big single conversions.

Both the S400 and S480 share the larger S4 center section and turbine architecture. The S480 is the 80 mm version of the S400 (larger compressors exist on the same frame), so people often treat it as its own tier when comparing spool and power. If you want the deep dive on the smaller frame, our complete S300 application guide for Cummins, CAT & Detroit breaks down every common variant.

Head-to-Head Comparison

Here’s the practical breakdown mechanics and fleet managers ask about most. Numbers are typical ranges, not absolutes, since wheel trim and A/R selection shift these figures.

Spec	S300	S400	S480
Compressor inducer	57-72mm	67-88mm	80mm
Horsepower range	320-1,000 hp	400-1,500+ hp	750-1,250 hp
Best displacement	5.9L-9L	10L-15L	10L-15L (high output)
Spool character	Fast, responsive	Moderate	Late, top-end heavy
Typical use	Daily driver, work truck, medium duty	Class 8 highway, tow rig, moderate performance	Race, sled pull, big single swap
Center section	S3 frame	S4 frame	S4 frame

When the S300 Is the Right Call

The S300 is the most popular BorgWarner turbo we stock, and for good reason. On a 5.9L or 6.7L Cummins, a properly sized S300 (think S363 or S366) gives you crisp throttle response, quick spool for towing, and enough airflow to support 500+ horsepower without lag. The Detroit Series 60 is a different case: its BorgWarner replacement is an S400, not an S300.

If you run a work truck, a medium-duty box truck, or a daily-driven tow rig, the S300 almost always wins on drivability. It builds boost early, so you’re not waiting for the turbo to wake up when you pull away from a light with a loaded trailer. For Series 60 owners specifically, our Detroit Series 60 turbocharger guide covers exact part numbers and replacement cost.

Many S300 variants use a wastegate actuator to control boost. When those fail, boost creep and overboost codes follow fast.

When to Step Up to the S400

Once you’re on a 10L to 15L engine, or you’re pushing toward the top of the S300’s range, the S300 runs out of compressor. That’s where the S400 earns its keep. An S467 or S475 supports serious airflow while still spooling reasonably on a big-displacement engine, because those larger engines move enough exhaust to light the bigger turbine.

The S400 is the standard for Class 8 highway trucks and performance diesel builds that need to make power without cooking the engine. On a Detroit Series 60, or as an upgrade on a Cummins ISX, the S400-class turbo is the balance point between spool and top-end. If you’re working on a C9 specifically, note that its factory turbo comes from the S310 family, which we cover in our Caterpillar C9 turbocharger guide.

Larger variable-geometry and wastegated units in this class use heavier-duty actuators.

When You Actually Need the S480

The S480 is not a highway turbo. With an 80mm compressor inducer, it’s built to move massive air for roughly 750 to 1,250 horsepower, which means it spools late and doesn’t care about low-RPM manners. If you put an S480 on a daily-driven work truck, you’ll hate the lag and the soft bottom end.

Where the S480 shines is competition and big single swaps: sled pulling, drag trucks, and dyno builds where you’re feeding it fuel and RPM. It’s also common as the atmosphere charger in a compound setup, sitting behind a smaller S300 or S400 that handles spool while the S480 provides the top-end flow. In a compound configuration, you get the best of both frames, quick response down low and huge airflow up top.

New vs Remanufactured: What Makes Sense

Once you’ve picked your frame, the next decision is new or remanufactured. For fleet operators and owner-operators watching cost per mile, a quality reman turbo often makes the most sense. Here’s how they compare on the factors that matter.

Factor	New Turbo	Remanufactured Turbo
Cost	Highest	30-50% less
CHRA balance	Factory spec	Rebalanced to factory spec
Wear parts	All new	All new bearings, seals, thrust
Availability	Can be backordered	Usually in stock
Warranty	Yes	Yes, when done right

A properly remanufactured S300, S400, or S480 gets new bearings, seals, and a thrust assembly, with the CHRA balanced to OEM tolerance. The performance difference on a correctly rebuilt unit is negligible, but the savings are real. Browse our remanufactured turbochargers or check the full lineup on our turbo shop page.

Already have a good core? Our turbocharger rebuild service restores your existing unit to spec, which is often the fastest path back to uptime when you’re running a specific OEM part number. If you’re spec’ing something outside these three frames, like a Volvo D12, see our Volvo D12 turbocharger guide.

Frequently Asked Questions

What is the main difference between the BorgWarner S300, S400, and S480?

The three represent progressively larger frame sizes, with the S300 suited to smaller diesels, the S400 for medium and heavy-duty applications, and the S480 for high-horsepower builds. Larger frames flow more air but generally spool later.

Which BorgWarner turbo is best for a 5.9L Cummins?

The S300 frame is typically the best match for a 5.9L Cummins, offering quick spool and strong response for medium-duty applications. Larger frames like the S400 may suit higher-horsepower or towing builds.

What happens if I choose the wrong turbo frame size?

Picking the wrong frame size costs you drive pressure, spool time, or top-end power. Matching the turbo to your engine displacement and power goals is critical for optimal performance.

Further reading: Learn more about BorgWarner.