Mitsubishi 20G Turbo Rebuild Service

PT Turbo rebuilds and remanufactures Mitsubishi 20G 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 Mitsubishi Evo High-Output Performance.

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Common Mitsubishi 20G Part Numbers

The following part and SKU numbers from PT Turbo’s catalog match or cross-reference to the Mitsubishi 20G:

Don’t see your number? Contact PT Turbo — we’ve been matching turbo part numbers since 1978.

Trouble Codes Often Seen on Mitsubishi Evo High-Output Performance Equipped with the Mitsubishi 20G

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 a handful of different names for the same unit.

• Mitsubishi 20G
• Mitsubishi TD06-20G
• 20G Evo turbo
• Mitsubishi Evo big 20G
• 20G high-output performance turbo
• Mitsubishi 20G upgrade turbo

Vehicles We Commonly See With the Mitsubishi 20G

The 20G is the largest-frame member of the Evo performance turbo family and shows up almost exclusively on aggressively built 4G63 and 4B11 platforms.

Mitsubishi Lancer Evolution (4G63)

• Lancer Evolution IV through IX (1996-2007)
• Evo VIII / IX builds targeting 400+ wheel horsepower
• 4G63T swap chassis running upgraded fueling and engine management

Mitsubishi Lancer Evolution (4B11)

• Lancer Evolution X (2008-2015) high-output street/strip builds
• 4B11T applications upgraded from the factory TD05 frame

High-Output Performance and Competition Cars

• Time-attack and drag 4G63 cars built for sustained high boost
• Rally-inspired street builds running the 20G as a top-end power upgrade

Common Mitsubishi 20G Failure Symptoms

• Excessive shaft play, both side-to-side and in-and-out, often the first sign of thrust wear
• Blue smoke on hard acceleration or during overrun decel
• Oil pooling in the intercooler piping or compressor housing
• Boost surge or inconsistent spool that wasn’t there before
• High-pitched whine or grinding at high RPM from worn bearings
• Loss of top-end boost or inability to hold target boost
• Visible compressor wheel blade damage or contact marks on the housing
• Oil consumption climbing with no external leak source

Real Mitsubishi 20G Failures We See in Our Shop

• On the Mitsubishi 20G units we rebuild, thrust bearing failure is the number one issue. These turbos get pushed to the edge of their boost range on big builds, and the constant load reversal hammers the factory thrust components until they let go.
• We frequently see bearing wear from sustained high-RPM operation. Cars that spend a lot of time at the top of the powerband wear the journal bearings faster than the lower-output siblings in this family ever do.
• Compressor wheel damage is common on aggressively tuned cars, especially where someone has run more boost than the wheel was meant to flow or ingested debris from a failed intake component.
• We pull a lot of 20G cores where the shaft has developed heavy play because oil supply got marginal at high RPM. Once the bearings start moving, the wheels rub the housings and the damage cascades quickly.
• On tuned-hard examples we often find scored thrust collars and discolored shafts from heat soak, a direct result of the extreme boost levels these turbos see on the dyno and at the track.

Preventing Future Mitsubishi 20G Failures

Most 20G failures we see come down to oil supply and heat management, both of which are easy to stay ahead of.

• Run a quality synthetic oil and keep change intervals short, 3,000 to 5,000 miles on a hard-driven car
• Let the car idle 60 to 90 seconds after a hard pull before shutdown to protect the bearings from heat soak
• Warm the oil up fully before going to high boost, especially in cold weather
• Check the entire boost path for leaks regularly so the turbo isn’t overspinning to make target boost
• Verify your oil feed line and restrictor are clean and correctly sized for this frame
• Keep a clean, properly fitted air filter to prevent debris from reaching the compressor wheel
• Confirm your tune isn’t commanding more boost than the wheel can safely flow

Common Mitsubishi 20G Upgrade Paths

Customers rebuilding a 20G frequently ask about strengthening the parts that fail first. The most common requests are upgraded billet compressor wheels for better flow and durability, heavier-duty thrust bearing assemblies to handle the high boost loads that kill the factory thrust setup, and upgraded journal bearings for cars that live at high RPM. Some builders also ask about oil feed and drain optimization to keep the center section better fed under sustained load. These are factual options many high-output owners consider, not requirements for a standard rebuild.

Frequently Asked Questions

How to Identify Your Mitsubishi 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 Mitsubishi 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 Mitsubishi 20G 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 Mitsubishi, 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.

Related Mitsubishi Models

Turbo Models That Fit the Mitsubishi 20G

• Mitsubishi 18G Turbo Rebuild Service