BorgWarner S363 Turbo Rebuild Service

PT Turbo rebuilds and remanufactures BorgWarner S363 turbochargers in-house at our San Bernardino, CA shop. Every unit goes through a full teardown, OEM-spec or better parts replacement, CIMAT VSR balancing, and final quality inspection before it ships back — backed by a 12-month unlimited mileage warranty and nationwide mail-in service. Commonly found on Performance Diesel.

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Trouble Codes Often Seen on Performance Diesel Equipped with the S363

These are generic diagnostic trouble codes commonly associated with turbo boost control issues on this application. They’re triggered by the vehicle’s ECU, not the turbo itself, so confirm with a scan tool before assuming the turbocharger is at fault.

• P0299 — Turbocharger/Supercharger Boost Pressure – Low (underboost)
• P0234 — Turbocharger/Supercharger Overboost Condition

Also Known As

Buyers searching for this turbo often use these names and variations:

• BorgWarner S363 turbocharger
• S363 SX-E
• BorgWarner S300 series 363
• S363 63mm performance turbo
• BorgWarner Performance Diesel S363
• S363 mid-frame diesel turbo

Vehicles We Commonly See With the S363

The S363 is a popular drop-in and upgrade choice across heavy-duty diesel platforms, and we see it on a mix of trucks and builds.

Cummins-Powered Dodge/Ram Trucks

• 1994-2002 Dodge Ram 5.9L 12-valve and 24-valve swaps
• 2003-2007 Dodge Ram 5.9L common-rail upgrade builds
• 2007.5-2018 Ram 6.7L Cummins single-turbo conversions

Ford Power Stroke Builds

• 1999-2003 7.3L Power Stroke single-turbo upgrade kits
• 2003-2007 6.0L Power Stroke retrofit setups
• 2008-2010 6.4L compound and single-turbo conversions

GM Duramax and Sled Pull / Race Builds

• 2001-2010 GM 6.6L Duramax LB7/LLY/LBZ/LMM upgrade builds
• Dedicated sled pull and drag truck applications
• Daily-driven tow rigs running 450-600+ horsepower

Common S363 Failure Symptoms

• Excessive shaft play, both side-to-side and in-and-out endplay you can feel by hand
• High-pitched whine or siren noise that climbs sharply under hard boost
• Blue or gray smoke at idle or during throttle tip-in from oil past worn seals
• Oil pooling in the compressor housing or intercooler piping
• Boost that builds slow or falls flat past the compressor’s efficient range
• Grinding or rubbing as the compressor wheel contacts the housing
• Sudden loss of boost paired with a knocking sound during acceleration
• Visible compressor or turbine wheel blade damage when you pull the intake or downpipe

Real S363 Failures We See in Our Shop

After rebuilding hundreds of these, the failure pattern on the S363 is consistent and tied directly to how these trucks get driven.

• We frequently see over-speed damage where the truck is tuned to push more air than the 63mm compressor can move efficiently. The wheel runs past its safe RPM, the blade tips erode and crack, and in the worst cases the wheel lets go entirely.
• On the S363 units we rebuild, thrust bearing wear is one of the most common findings. Aggressive throttle stabbing and big boost spikes hammer the thrust surface, and once that thrust face wears, the rotating assembly walks fore and aft and starts contacting both housings.
• We pull a lot of these in with bearing failure caused by oil starvation during hard acceleration, especially on trucks with marginal oil supply lines or restricted feed fittings. The bearings run dry under load for just a moment and that is enough to wipe them.
• Coked and contaminated oil in the center section shows up constantly, usually on trucks shut down hot after a hard pull. The baked oil restricts flow and accelerates the bearing wear we already mentioned.
• We also see compressor wheels rubbed into the cover from worn bearings letting the rotating assembly drop, which masquerades as a balance problem but is really a lubrication and clearance issue.

Preventing Future S363 Failures

Most S363 failures we see are preventable with a few disciplined habits.

• Change engine oil and filter on schedule with a quality diesel-rated oil, since the turbo lives and dies on clean oil supply
• Let the turbo cool down for 2-3 minutes after towing or a hard pull before shutting the engine off to prevent oil coking
• Verify the oil feed line and any restrictor fitting are clear and correctly sized, especially after a previous turbo swap
• Keep tuning honest and within the compressor map so you are not over-speeding the wheel chasing numbers it cannot make efficiently
• Check the full charge air system for boost leaks at clamps, couplers, and the intercooler so the turbo is not working harder than it should
• Run a clean air filter and inspect for cracked intake boots that let dirt reach the compressor wheel
• Avoid hard throttle on a cold engine before oil pressure and flow are fully up to the center section

Common S363 Upgrade Paths

Customers rebuilding an S363 often ask what they can change while it is apart. The most common requests are upgraded billet compressor wheels for better airflow and over-speed resistance, different compressor and turbine wheel trims to shift the power band toward towing or higher-RPM race use, and 360-degree thrust bearings to handle the higher thrust loads that come with aggressive driving. Some customers moving more power look at stepping up frame size entirely, while tow-focused owners usually prioritize bearing and thrust reliability over peak airflow. We can discuss which direction fits your power goal during the rebuild.

Frequently Asked Questions

How to Identify Your BorgWarner Turbo

The identification tag is typically located on the compressor housing, bearing housing, or center section of the turbocharger. It usually lists the model number, assembly number, and serial number. If you’re not sure which BorgWarner model you have, send PT Turbo a photo of the tag and we’ll help identify it before you ship anything.

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

What the S363 Rebuild May Include

• Complete teardown of all major components
• Ultrasonic or parts cleaning to remove carbon, oil residue, and contamination
• Journal bearing, thrust bearing, and seal replacement
• O-rings and hardware replacement
• Shaft and wheel inspection, with compressor or turbine wheel replacement if needed
• Wastegate inspection and actuator linkage service, when equipped
• CIMAT VSR balancing
• Final inspection

Why Customers Choose PT Turbo

• Rebuilding turbochargers, including BorgWarner, since 1978
• In-house CIMAT VSR balancing on every unit, not outsourced
• Full housing sandblasting and OEM-spec or better parts replacement
• Inspect first, quote before work begins — no surprise charges
• Nationwide mail-in service from our San Bernardino, CA shop

PT Turbo Inspection Process

Every turbocharger goes through the same evaluation before any work begins:

1. Initial evaluationcompressor wheel, turbine wheel, shaft, bearing housing, VGT assembly (if equipped), actuator, and seal surfaces are checked first.
2. Complete disassemblythe turbocharger is fully torn down and every major component is inspected individually.
3. Cleaningcomponents are cleaned to remove carbon, oil residue, rust, and contamination.
4. Measurementcritical tolerances are measured against OEM specification.
5. Reassemblyrebuilt using new wear components matched to your specific model.
6. CIMAT VSR balancingthe rotating assembly is balanced in-house, with a balance report included.
7. Final inspectionleak test, visual inspection, and actuator or wastegate function check before shipment.

No work begins without your approval. You receive a quote after inspection, not before.

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.

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