BorgWarner S366 vs S369: Which Turbo Is Right for You?

BorgWarner S366 Turbo Rebuild Service →  |  BorgWarner S369 Turbo Rebuild Service →

Quick Overview

The BorgWarner S366 and S369 are both popular choices in the S300 family, but they sit at slightly different points on the performance ladder. The core difference comes down to frame size: the S369 is a larger frame than the S366, which gives it more flow capacity for bigger builds. That added capacity comes with tradeoffs, including a slower spool and more thrust load risk if the oil supply is not upgraded to match.

In practical terms, the S366 is the more responsive, easier-living of the two, while the S369 trades some of that low-end snappiness for the ability to feed a more aggressive setup. Choosing between them is mostly about matching the turbo to your power goals and how you actually drive.

Which Spools Faster?

The S366 spools faster of the two. Because it uses a smaller frame than the S369, it builds boost sooner and feels more responsive in the lower and middle of the rev range. The S369, being the larger frame, carries a slower spool as a direct consequence of its added flow capacity. If quick response and minimal lag are high on your priority list, the S366 has the advantage here.

Which Supports More Power?

The S369 supports more power. Its larger frame gives it more flow capacity, which makes it the better fit for bigger performance builds that need to move more air. The S366 is no slouch, but it is simply the smaller of the two and tops out sooner. If your build is chasing higher output and you can tolerate the later spool, the S369 is the one with more headroom.

Which Is Right for Your Application?

For towing and daily driving, the S366 is generally the smarter pick. Its faster spool means usable boost is available sooner, which is exactly what you want for hauling loads, stop-and-go driving, and a vehicle that has to behave well under everyday conditions.

For performance and racing applications, the S369 makes more sense. The larger frame and added flow capacity let it feed a more aggressive build, and the slower spool is easier to live with when the vehicle spends most of its time in the upper rev range. Just be aware that the S369 carries more thrust load risk if the oil supply is not upgraded to match, so the supporting hardware needs to be planned around it.

Rebuild Considerations

Both turbos come from the same S300 family and follow similar rebuild procedures, so the basic process is comparable. The key difference to keep in mind is that the S369’s larger frame brings more thrust load risk if the oil supply is not upgraded to match. That makes proper oil feed and matched supporting components more important on the S369, and it is worth verifying the thrust bearing and oiling setup during any rebuild to avoid repeat failures.

Quick Comparison

How to Tell Them Apart

The reliable way to tell a BorgWarner S366 from a S369 is the identification tag, not appearance alone. The housings on adjacent frame sizes within the same family can look similar at a glance, so confirm the model designation and assembly number stamped or plated on the unit before ordering rebuild parts. Exact configuration (wheel trim, housing A/R, calibration) varies by specific part and assembly number even within the same model name, so the assembly number is what actually determines which parts are correct for your unit.

For the full process, see our How to Identify a BorgWarner Turbo guide.

Frequently Asked Questions

PT Turbo Warranty

• 12-month, unlimited mileage warranty against defects in parts and workmanship
• Final quality inspection on every rebuild: leak test, visual inspection, actuator or wastegate function check
• In-house CIMAT VSR balancing with a balance report included
• Nationwide mail-in service — you don’t need to be local

Pricing

Most rebuilds require inspection before final pricing. Standard rebuild pricing depends on the turbo model, parts availability, wheel condition, shaft condition, housing damage, and whether upgrades are requested. PT Turbo inspects every turbo and sends a quote before any work begins — no surprise charges.