GReddy / Trust Turbocharger Rebuild

GReddy Turbo Rebuild

Complete in-house rebuild service for the full GReddy / Trust turbocharger lineup. T517Z, T518Z, T618Z, T620Z, TD05H and TD06 spec units, T67-25G, T78, and T88. Every GReddy turbo is built on Mitsubishi Heavy Industries internals, and we stock MHI rebuild components across the entire range. In-house VSR balancing since 2008.

MHIInternals ThroughoutT88The JDM IconTZBolt-On Series

Start Your Rebuild

TZ SeriesT517Z T518Z T618Z T620Z

Mid FrameTD05H TD06 Spec / T67-25G

Big SinglesT78 T88

Core DesignMHI TD05 through TD08

Key AppsSkyline GT-R Supra RX-7

In Shop Since2008, 17+ years

Turbo Families

Every GReddy Turbo We Rebuild

GReddy is the performance brand of Trust Company Ltd, and every turbo in the lineup is built on a Mitsubishi Heavy Industries core. That MHI foundation means rebuild components are stocked in-house, the same parts we carry for the TD05 through TD08 lines.

T517Z / T518Z

300 to 500 HP: TD05H-Based Bolt-Ons

The TZ series covers GReddy's bolt-on and universal turbo range built on MHI TD05H internals. The T517Z was offered in 8cm and 10cm turbine housing options with P750 and P765 spec variants for specific vehicle applications including the Skyline GT-R. The T518Z is the slightly larger follow-on. Rebuild components are the TD05H parts we stock, so turnaround on TZ units is fast.

Applications: Nissan Skyline GT-R R32 / R33 / R34 / S13 / S14 / S15 / Honda / Subaru / Toyota JZX100 / universal

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T618Z / T620Z

400 to 600 HP: Larger TZ Variants

The larger TZ variants step up wheel sizes on the same MHI architecture. The T618Z was the basis of GReddy's Mazda RX-8 turbo kit, one of the few forced induction solutions ever productized for the RENESIS rotary. The T620Z extends the range further for higher-output applications.

Applications: Mazda RX-8 (T618Z kit) / Nissan 370Z twin kits / high-output street builds

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TD05H / TD06 Spec Units

350 to 600 HP: GReddy-Spec MHI

GReddy sells TD05H-18G, TD05SH-18G, TD06SH-20G, TD06SL2-20G, TD06SH-25G, and TD07S-25G spec turbos: MHI units with GReddy-selected wheel and housing combinations. These are the direct upgrade path for EVO, DSM, WRX/STI, and rotary platforms. Everything on our MHI page applies to these units, same internals, same stocked parts.

Applications: Mitsubishi EVO / DSM / Subaru WRX STI / Mazda RX-7 / Nissan S-chassis / Toyota JZ upgrades

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T67-25G

500 to 750 HP: The Hybrid

The T67 is a hybrid: MHI TD07 compressor hardware with a GReddy-spec 25G wheel mated to a TD06 turbine section in a machined TD06H exhaust housing. It became one of the most popular JDM big-street turbos of its era for the EVO, DSM, and rotary communities. Both compressor and turbine side components are stocked.

Applications: Mitsubishi EVO / DSM / Galant VR-4 / Mazda RX-7 FD3S / MR2 SW20 upgrade builds

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T78

600 to 900 HP: TD08 Compressor, TD07 Turbine

The T78 pairs an MHI TD08 compressor section with a TD07 turbine. Offered in 29D and 33D wheel specs with multiple turbine housing sizes (14cm, 17cm being the common ones). The T78 33D on an RB26 or 2JZ was the definitive JDM big single of the late 1990s. Kits were sold for the Skyline GT-R, Supra JZA80, and RX-7 FD3S.

Applications: Nissan Skyline GT-R R32 / R33 / R34 / Toyota Supra JZA80 / Mazda RX-7 FD3S

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T88

700 to 1000+ HP: The Icon

Full MHI TD08 turbine and compressor sections. The T88-33D, T88-34D, and the top T88-38GK with its 38GK compressor wheel. The T88 on a 2JZ Supra is one of the most iconic turbo and engine pairings in JDM history. Wheel spec matters on these: we confirm which T88 variant you have before quoting wheel replacement, since the specs do not interchange.

Applications: Toyota Supra JZA80 / Nissan Skyline GT-R / extreme HP street and drag builds

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Part Number Reference

Find Your Part Number

Search by GReddy part number, turbo model, engine, or application. GReddy part numbers follow the 115XXXXX format. If your number is not listed or the ID tag is missing, send photos and we can identify the unit before you ship.

Showing all 24 part numbers

Part Number	Model	Engine	Application	Type
TZ Series
11500121	T517Z 8cm P750	RB26DETT	Nissan Skyline GT-R R32 / R33 / R34	GReddy Turbo
11500122	T517Z 10cm P750	RB26DETT	Nissan Skyline GT-R R32 / R33 / R34	GReddy Turbo
11500123	T517Z 8cm P765	Various	S13 / S14 / S15 / Honda / Subaru applications	GReddy Turbo
11500124	T517Z 10cm P765	Various	S13 / S14 / S15 / Honda / Subaru applications	GReddy Turbo
11500131	T518Z 8cm	Various	GReddy bolt-on turbo applications	GReddy Turbo
11500132	T518Z 10cm	Various	GReddy bolt-on turbo applications	GReddy Turbo
11500141	T618Z	13B RENESIS	Mazda RX-8 turbo kit	GReddy Turbo
11520097	T517Z 8cm Twin Kit	VQ37VHR	Nissan 370Z Z34	GReddy Twin Kit
TD05H / TD06 Spec
11500161	TD05H-18G	EJ20 / EJ25	Subaru WRX / STI upgrade	GReddy Turbo
11500171	TD05SH-18G	EJ20 / EJ25	Subaru WRX / STI upgrade	GReddy Turbo
11500201	TD06SH-20G	4G63T / 13B-REW	EVO / DSM / RX-7 upgrade	GReddy Turbo
11500211	TD06SL2-20G	EJ20 / SR20DET	WRX / STI / S13 / S14 upgrade	GReddy Turbo
11500221	TD06SH-25G	4G63T / 2JZ-GTE	EVO / Supra high-HP upgrade	GReddy Turbo
11500241	TD07S-25G	2JZ-GTE / RB26DETT	Supra / Skyline high-HP upgrade	GReddy Turbo
T67
11500151	T67-25G	4G63T / 13B-REW	Mitsubishi EVO / DSM / Mazda RX-7 upgrade	GReddy Turbo
T78 Kits
11520038	T78 33D Single Kit	RB26DETT	Nissan Skyline GT-R R32 BNR32	GReddy Kit
11520065	T78 Kit	RB26DETT	Nissan Skyline GT-R R32 / R33 / R34	GReddy Kit
11510030	T78 29D 14cm Kit	2JZ-GTE	Toyota Supra JZA80	GReddy Kit
11510509	T78 29D 17cm Kit	2JZ-GTE	Toyota Supra JZA80	GReddy Kit
11510510	T78 33D 17cm Kit	2JZ-GTE	Toyota Supra JZA80	GReddy Kit
11540032	T78 33D Kit	13B-REW	Mazda RX-7 FD3S	GReddy Kit
T88 Kits
11510516	T88 34D 22cm Kit	2JZ-GTE	Toyota Supra JZA80	GReddy Kit
11510517	T88 33D Kit	2JZ-GTE	Toyota Supra JZA80	GReddy Kit
11520069	T88 38GK Kit	RB26DETT / 2JZ-GTE	Skyline GT-R / Supra extreme HP	GReddy Kit

No results? Contact us at sales@theboostlab.com with your part number or photos and we can identify your unit.

Common Failure Modes

Why GReddy Turbos Come In

101

Age and Unknown History

Most GReddy kits in the US were installed 15 to 25 years ago and have changed hands with the cars. Bearing clearances open gradually and shaft play often goes unnoticed until wheel contact occurs. Any GReddy unit with unknown service history deserves an inspection.

202

Oil Coking from Hot Shutdown

Big singles retain enormous heat after hard pulls. Shutting down without a cooldown period bakes residual oil into carbon in the center housing. T78 and T88 units from cars without turbo timers show this almost universally at teardown.

303

Oil Starvation

Aftermarket install variables: restrictor sizing, feed line routing, and drain angle vary kit to kit and installer to installer. A marginal oil supply that worked at street power shows up as bearing wear when the boost gets turned up. We check feed and drain requirements against your setup on every rebuild.

404

Compressor Surge

Big wheels on responsive engines invite surge when boost targets, blow-off valve behavior, or throttle mapping are mismatched. Repeated surge loads the thrust bearing in reverse and can crack wheel blades. Thrust wear patterns tell the story at teardown.

505

Overspeed from Ambition

A T67 pushed to T78 power levels, or a T88-33D chasing 38GK numbers, runs past its map edge. Blade stretch, tip erosion, and hub cracking follow. We inspect every wheel for overspeed indicators and will tell you honestly if your power goal needs a different spec.

606

Foreign Object Damage

Open filters on low intakes, deteriorating couplers, and debris left in piping during installs all end up in the compressor wheel. Even minor tip damage creates imbalance that accelerates bearing failure at big-single shaft speeds.

Common Questions

Frequently Asked Questions

Who actually makes GReddy turbos?

Mitsubishi Heavy Industries. Every GReddy turbocharger is built on MHI internals. GReddy (Trust Company Ltd in Japan) develops proprietary compressor housings, turbine housings, and application-specific packaging around MHI CHRA cores. The T517Z and T518Z are TD05H-based. The T67 uses TD07 compressor hardware on a TD06 turbine section. The T78 pairs a TD08 compressor with a TD07 turbine, and the T88 is a full TD08. This is good news for rebuilds: the internal components are the same MHI parts we stock for the TD05 through TD08 lines.

Is a T88 rebuild different from a TD08 rebuild?

Internally, no. The T88 runs MHI TD08 rotating assembly components, so the bearing system, piston rings, and thrust hardware follow the same rebuild process as any TD08. The GReddy-specific parts are the housings, which we clean, inspect, and reuse. If a compressor or turbine wheel needs replacement we source the correct MHI wheel for your specific T88 variant, since GReddy offered multiple wheel specs (T88-33D, T88-34D, T88-38GK) with different inducer sizes.

Can you tell which GReddy turbo I have from photos?

Usually yes. The casting marks on the compressor housing, the inlet size, and the turbine housing shape identify the family. The wheel spec inside requires the unit in hand or a clear photo straight into the compressor inlet with something for scale. Send photos to sales@theboostlab.com and we will identify it before you ship. If the GReddy ID tag is still riveted to the compressor housing, that tells us everything.

My T78 kit came on a Supra I bought. Should I rebuild it preventively?

If you do not know the service history, yes. Most T78 and T88 kits in the US were installed in the late 1990s through 2000s and many have never been opened since. Bearing clearances open up gradually and the first obvious symptom is often shaft play that has already allowed wheel contact. A preventive rebuild on an unknown-history unit costs far less than a rebuild plus wheel replacement after contact damage. We inspect and give you an honest assessment either way.

How do I ship my GReddy turbo?

Submit the rebuild form at repair.theboostlab.com first. Drain residual oil, plug all ports, and double-box with foam padding. The T78 and T88 are heavy units, so use a strong outer box and fill all voids. Ship via UPS or FedEx to 37833 Pineapple Ave Unit A, Dade City, FL 33523. We will send a receiving confirmation when it arrives.

What is the turnaround time?

Standard turnaround is 7 to 14 business days from the day your turbo arrives. Because GReddy units run MHI internals, most rebuild components are stocked in-house. All work including VSR balancing is done in-house. If wheel replacement is needed we contact you before proceeding with an updated timeline and quote.

Related service pages: Mitsubishi MHI HKS T51R Nissan GT-R Toyota Starion/Conquest

Ready to Rebuild?

Start your rebuild request in our repair system. GReddy units run MHI internals and the parts are stocked. Every job is documented from intake through return shipment.

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37833 Pineapple Ave Unit A • Dade City, FL 33523 • sales@theboostlab.com