Understanding the Evo 9 Turbo Rebuild Process

The Mitsubishi Lancer Evolution IX, often called the Evo 9, remains a legend in the performance car world. Its 4G63 engine, paired with a factory Mitsubishi TD05HR-16G6-9.8T turbocharger, delivers responsive power that enthusiasts crave. However, after years of hard driving, the turbo can develop shaft play, oil leaks, or worn bearings. A rebuild restores the turbo to like-new condition—or better. The process involves carefully disassembling the center housing rotating assembly (CHRA), inspecting the turbine and compressor wheels, and replacing seals, bearings, and the thrust washer. Some rebuild kits also include a new wastegate actuator or ported housings for improved spool.

Many owners choose to rebuild rather than replace because the factory turbo housing is durable and can be upgraded with modern internals. A quality rebuild can extend turbo life for tens of thousands of miles. Garrett Motion and other manufacturers offer direct-replacement parts for the TD05 platform, making sourcing easy. Whether you DIY or hire a specialist, understanding the scope of work is essential before committing.

Costs of an Evo 9 Turbo Rebuild

Rebuild costs depend on parts quality, labor rates, and whether you choose a basic refresh or a full performance upgrade. Below is a detailed breakdown of typical expenses.

Parts Costs

  • Basic Rebuild Kit (seals, bearings, gaskets): $100–$300
  • Complete Rebuild Kit (includes thrust washer, piston ring, oil ring): $300–$600
  • Performance Rebuild Kit (upgraded thrust bearing, larger oil feed, ported housings): $600–$1,200
  • Optional Upgrades (clipped turbine wheel, billet compressor wheel): $200–$400 per component

Quality brands like Blouch Turbo or Forced Performance offer kits tailored for the Evo 9. Importing from Japan can add shipping costs, but many US distributors stock parts.

Labor Costs

  • DIY Rebuild: $0 (requires special tools like a torque wrench, snap ring pliers, and a turbo balancing machine)
  • Shop Labor (turbo removal, rebuild, reinstall): $500–$1,200 depending on hourly rate
  • Professional Balancing (if needed): $50–$150

Most quality shops charge between $80–$150 per hour, and a full rebuild typically takes 4–6 hours of labor, not including removal/installation of the turbo from the car.

Total Estimated Cost Range

  • Budget DIY rebuild (basic kit, no balancing): $300–$600
  • Shop rebuild with basic kit: $800–$1,500
  • Performance rebuild (upgraded wheel, balancing, shop labor): $1,500–$2,500
  • Full upgraded turbo replacement (new or larger unit): $1,800–$3,500+

Always get a quote from a reputable turbo specialist before starting. Some shops offer exchange units for faster service.

Choosing the right brand for rebuild components directly impacts reliability and power. Here are the most trusted names in the Evo community.

Garrett Motion

Garrett supplies turbo hardware for many OEMs and aftermarket solutions. Their GTX3076R and GTX3576R journal bearing cartridges can be retrofitted into the Evo 9’s factory housing with a custom adapter. Their rebuild kits use high-temperature alloys and dual ceramic ball bearings for reduced lag.

Blouch Turbo

Blouch specializes in Subaru and Mitsubishi applications. Their TD05 16G-9.8T rebuild kit includes a ported shroud compressor cover and upgraded 360-degree thrust bearing. Many Evo owners report a 30–40 hp increase with proper tuning when using Blouch’s billet wheel option.

Forced Performance (FP)

FP offers fully assembled turbo units and rebuild parts. Their FP Green or FP Red turbos are popular upgrades, but they also sell component-level rebuild kits for the factory TD05. FP’s custom balancing ensures high-speed durability.

Turbonetics

Turbonetics provides a wide range of turbo rebuild components, including high-flow compressor wheels and wastegate actuators. Their Turbo Rebuild Kit for Mitsubishi TD05 features a Kevlar piston ring and Viton oil seal.

Other Notable Brands

  • Comp Turbo: Known for ceramic ball bearing cartridges that drop into factory housings.
  • Precision Turbo & Engine (PTE): Offers billet wheels and anti-surge housings for high-boost applications.
  • Custom fabricators (e.g., Full-Race, MAPerformance): Can machine hybrid turbo setups with larger turbine housings.

Power Gains from an Evo 9 Turbo Rebuild

The power increase from a rebuild depends on the parts used and supporting modifications. Below are realistic expectations for different approaches.

Stock Configuration Rebuild

Rebuilding the factory turbo with OEM-quality parts restores lost performance. On a healthy engine, you may regain 10–20 wheel horsepower (whp) and improved response. No gain is seen if the old turbo wasn’t worn—but most 100k-mile+ turbos are down 5–10% from new.

Rebuild with Billet Compressor Wheel

Swapping the cast factory wheel to a billet 16G or 18G wheel (e.g., Blouch or Forced Performance) adds 20–40 whp on pump gas with proper tuning. The billet design flows more air at the same boost pressure, so torque comes on earlier. Expect around 350–380 whp on a stock block with a boost controller and exhaust.

Rebuild with Larger Turbine Housing

Porting the exhaust housing or installing an 8cm² (up from stock 7cm²) housing reduces backpressure and moves the torque peak higher. Gains of 30–50 whp are typical when combined with a larger compressor wheel. This setup can push 400 whp with cams and a good intercooler.

Full Hybrid Turbo Upgrade (Rebuild + Replace)

Using a complete upgrade turbo like the FP Green (61mm compressor) or Garrett GTX3076R with an adapter can yield 450–550 whp on E85. But this requires a rebuilt core or new CHRA, plus supporting mods. The rebuild portion still costs $1,200–$2,000, but the horsepower ceiling is significantly higher.

Typical Power Ranges by Build Level

  • Basic rebuild (factory parts): 280–320 whp (stock boost 19 psi)
  • Stage 1 rebuild (billet wheel, ported housing): 340–380 whp (22–24 psi)
  • Stage 2 rebuild (larger wheel + housing, meth injection): 380–430 whp (25–28 psi)
  • Full hybrid turbo (new CHRA, billet 60+mm, E85): 450–550 whp (30+ psi)
Caution: The Evo 9’s stock connecting rods and pistons are strong to about 500 whp. Beyond that, internal engine work is mandatory.

Should You Rebuild or Replace the Turbo?

Rebuilding is cost-effective if the turbo housing is intact and you want to retain the stock appearance. Replacement with a new or larger unit is simpler if you want more than 400 whp without sending your turbo out. Consider these trade-offs:

  • Rebuild: Cheaper, retains original manifold fitment, but requires downtime (1–2 weeks if shipping).
  • Replace with stock new turbo: $1,200–$1,800, less time, no core exchange needed.
  • Replace with larger aftermarket turbo: $2,000–$4,000, requires tuning and possible intake/exhaust modifications.

For most enthusiasts seeking a moderate power bump under $2,500, a rebuild with upgraded internals is the sweet spot.

Tuning and Supporting Modifications

A rebuilt turbo alone won’t maximize power without correct tuning and hardware. Essential supporting mods include:

  • Fuel system: Walbro 255 lph or AEM 340 lph fuel pump, larger injectors (850cc–1200cc for E85)
  • Intercooler: Front-mount intercooler (FMIC) from ETS, Spearco, or HKS keeps intake temps down
  • Exhaust: Downpipe (3-inch), high-flow catalytic converter or test pipe, cat-back exhaust
  • Engine management: ECU flash via EcuFlash, Cobb Accessport, or stand-alone like Haltech or AEM EMS
  • Boost control: Electronic boost controller (e.g., AEM, TurboSmart) to fine-tune boost curve

Without these, a rebuilt turbo may not reach its potential or could run dangerously lean. Always have the vehicle tuned on a dyno or by a remote tuner with data logging.

Maintenance and Reliability After a Rebuild

A properly rebuilt turbo can last another 60,000–100,000 miles if you follow good practices. Key maintenance tips:

  • Use high-quality synthetic oil: 5W-40 or 10W-40 (Mobil 1, Motul, or Royal Purple) and change every 3,000–5,000 miles.
  • Let the turbo cool after hard driving: Idle 30–60 seconds before shutdown to prevent oil coking.
  • Check boost leaks regularly: A leak causes the turbo to spin faster than designed, leading to premature failure.
  • Monitor oil pressure and temperature: Gauges help catch issues early.

If you rebuild the turbo yourself, verify that the shaft spins freely and that there is minimal end play after assembly. Professional balancing is recommended for any rebuild that exceeds 300 whp.

Common Pitfalls to Avoid

  • Using cheap rebuild kits: Off-brand seals may degrade quickly under high EGTs.
  • Reusing oil feed lines: Old restrictors or clogged lines can starve the new bearings. Replace them.
  • Skipping the wastegate repair: A sticky wastegate actuator causes overboost. Rebuild or replace it.
  • Not cleaning the intercooler and piping: Metal shavings from a failed turbo can destroy a fresh rebuild. Flush the entire intake tract.

Conclusion: Is a Turbo Rebuild Right for Your Evo 9?

Rebuilding the turbo on your Evolution IX is a proven way to restore lost performance or unlock moderate gains without spending thousands on a full turbo kit. Costs range from $800 to $2,500 depending on parts and labor. The power improvement can be as modest as 20 whp with a stock refresh—or over 100 whp with a billet wheel and proper tuning. Popular brands like Garrett, Blouch, and Forced Performance offer reliable rebuild components.

Before starting, evaluate your power goals, budget, and willingness to perform supporting modifications. A well-executed turbo rebuild combined with a quality tune yields an Evo 9 that’s both thrilling and dependable for years to come.

For more detailed guidance, consult EvolutionM.net for community build threads and local turbo specialists.