The DSM community is the most passionate turbo community on the internet, and every one of these cars runs Mitsubishi Heavy Industries hardware that Boost Lab, Inc. rebuilds daily. First-generation cars use the TD04-13T (49177-01900) on automatics and the TD05H-14B (49178-01010/01030) on manuals, with the Big 16G (49178-01420) and Evo III 16G (49178-01470) as the community-standard upgrades. Second-generation cars run the Garrett TB2566 (466491-0005/0006). We rebuild every unit in the DSM turbo family tree. Nationwide ship-in service.
Two generations, two completely different turbo architectures, and thirty years of upgrades. The tag number is everything.
The manual-transmission 1G Eclipse GST, GSX, Talon TSi and Laser RS Turbo run the MHI TD05H with the 14B compressor wheel: 49178-01010 under Mitsubishi MD138226 and 49178-01030 under MD168038. The 14B is the baseline that everyone upgrades from, and the upgrade path stays on the same TD05H frame: small 16G, big 16G, Evo III 16G, 18G, 20G, all bolt on.
Automatic 1G cars run the smaller TD04 frame, MHI 49177-01900 under Mitsubishi MD157738. The TD04 does not accept TD05H upgrade wheels, so upgrading an auto car means swapping the entire turbo to a TD05H-frame unit, which is exactly what most owners do.
Second-generation Eclipse GST, GSX and Talon TSi moved to a Garrett TB2566, part numbers 466491-0005 (Mitsubishi MR187909) and 466491-0006 (MR187910). The 2G turbo uses a Mitsubishi turbine housing flange, not a standard Garrett T25 flange, so it is not a direct swap with Nissan or Mazda T25 units. The community upgrade path from the TB2566 goes to TD05H-frame 16G units via a manifold swap.
The whole DSM upgrade culture runs on the TD05H frame: Small 16G (49178-01520, 49178-05200), Big 16G (49178-01420, MD168037), Evo I 16G (49178-01450), Evo II 16G (49178-01460), and Evo III 16G (49178-01470, MR239345) are the factory Mitsubishi compressor upgrades. Beyond the 16G, the community runs 18G, 20G and larger hybrids on the same frame. We rebuild all of them and balance every assembly.
The JDM Galant VR-4 and US-market Galant VR-4 run the same 4G63T with the same TD05H turbo family. VR-4 14Bs use 49178-01400 and 49178-01410. If it has a 4G63 and an MHI turbo, we rebuild it.
The 4G63 turbo ecosystem is one of the most supported in existence: the same TD04 and TD05H families served the DSM, the Galant VR-4, the Starion/Conquest, and every Lancer Evolution from I through IX. Bearing, seal, thrust, and wheel support will outlive every car that uses them. Your casting is the only part worth preserving, and it is almost always serviceable.
Most 1G 14Bs that come across our bench did not fail from boost or age: they failed from oil starvation caused by coked feed lines, neglected oil, and hot shutdowns. The 4G63 runs its turbo oil feed off a banjo fitting that clogs with carbon over time, exactly like the Mazda DISI. A rebuilt 14B or 16G installed on a coked feed line dies the same way the original did. Replace the feed line, use quality oil, and idle down after hard runs. Those three habits are worth more than any hardware upgrade.
The complete verified MHI and Garrett DSM turbo family. The tag on the compressor housing governs everything: do not order parts by model name alone. Search by any number.
| Turbo PN | Model | OEM PN | Application | Notes |
|---|---|---|---|---|
| 49177-01900 | MHI TD04-13T | Mitsubishi MD157738 | 1990-1994 1G Eclipse GST/GSX, Talon TSi (auto only) | Smaller TD04 frame; does not accept TD05H wheels |
| 49178-01010 | MHI TD05H-14B | Mitsubishi MD138226 | 1990-1994 1G Eclipse GST/GSX, Talon TSi, Laser RS (manual) | The baseline 14B; 43mm inducer, 58mm exducer |
| 49178-01030 | MHI TD05H-14B | Mitsubishi MD168038 | 1990-1994 1G (later revision) | Running revision of the -01010 |
| 49178-01520 / 49178-05200 | MHI TD05H Small 16G | Mitsubishi MD171223 | 1G upgrade (bolt-on to 14B location) | 46.5mm inducer, 60mm exducer; 6cm2 housing |
| 49178-01420 | MHI TD05H Big 16G | Mitsubishi MD168037 | 1G upgrade / VR-4 RS OEM | 48mm inducer, 68mm exducer; the community standard |
| 49178-01450 | MHI TD05H Evo I 16G | Verify by tag | Evo I OEM / 1G upgrade | Same wheel family as Big 16G; 6cm2 housing |
| 49178-01460 | MHI TD05H Evo II 16G | Verify by tag | Evo II OEM / 1G upgrade | 6cm2 housing |
| 49178-01470 | MHI TD05H Evo III 16G | Mitsubishi MR239345 | Evo III OEM / premium 1G upgrade | 48.3mm/68mm; 7cm2 housing, curved inlet flange, 34mm flapper |
| 49178-01400 / 49178-01410 | MHI TD05H-14B | VR-4 OEM | Galant VR-4 (JDM and US) | 14B wheel; -01410 is ASPEC variant |
| 466491-0005 | Garrett TB2566 | Mitsubishi MR187909 | 1995-1999 2G Eclipse GST/GSX, Talon TSi | Mitsubishi turbine housing flange, NOT standard T25 |
| 466491-0006 | Garrett TB2566 | Mitsubishi MR187910 | 1995-1999 2G Eclipse GST/GSX, Talon TSi | Running revision of -0005 |
| Tag-specific | TD05H 18G / 20G / larger hybrids | n/a (aftermarket) | Community upgrade builds on the TD05H frame | Rebuilt and balanced; send tag and wheel photos |
The 4G63 turbo failure patterns are well documented after 35 years. Here is what the bench confirms.
The defining DSM turbo failure. The banjo fitting clogs with carbon from age, heat, and neglected oil changes until the turbo starves. The bearings wipe, the shaft walks, and the owner blames the turbo. Replace the feed line with every turbo job, or the replacement dies the same way.
Hard pull, immediate shutdown, baked oil. The 4G63 turbo sits high in a hot engine bay with no turbo timer culture in the DSM world. Decades of this habit are what we find inside every coked center section. Sixty seconds of idle before shutdown is free turbo insurance.
The DSM community has been winding up boost since 1990, and stock thrust bearings pay for it. The 14B's thrust assembly is the first casualty of boost increases, and the compressor wheel walking into the housing is the symptom. Upgraded thrust parts are standard on our performance rebuilds.
A large share of circulating 16G cores are Chinese copies with wrong clearances, unbalanced assemblies, and no documentation. We open them regularly: mismatched bearings, missing thrust parts, and compressor wheels that were never designed for the housing they sit in. Every assembly we build is VSR balanced with verified components.
The 1G log manifold and the 2G tubular manifold both crack with age and boost, bleeding exhaust energy that should be spooling the turbine. The turbo feels lazy, the owner condemns it, and the real problem is the manifold. Check before condemning.
These are 25-to-35-year-old cars now, and original 14Bs with 150,000-plus miles arrive with honest wear: shaft play, whine, oil consumption. Caught before wheel contact, the rebuild is routine.
Compressor wheel size and exhaust housing. The Small 16G (49178-01520) runs a 46.5mm inducer; the Big 16G (49178-01420) steps up to 48mm; the Evo III (49178-01470) runs 48.3mm with a 7cm2 housing and a curved inlet flange. The Evo III flows the most and commands the highest price. All three bolt to the same TD05H manifold location.
It is a Garrett TB2566, not a standard T25. Part numbers 466491-0005 and -0006, Mitsubishi MR187909 and MR187910. It uses a Mitsubishi turbine housing flange, not a Garrett T25 flange, so Nissan and Mazda T25 units are not direct swaps.
We will assess any core, but we are honest about what we find. Chinese-copy 16Gs often have wrong clearances and components that do not meet specification. If the core is salvageable we rebuild it properly; if it is not, we will tell you.
Yes. The TD05H frame accepts the full MHI compressor wheel family: 14B, Small 16G, Big 16G, Evo III 16G, 18G, 20G. Tell us your power goal and we will spec the rebuild honestly. The housing from your 14B is the same housing; only the internals change.
Yes, but it is a full turbo swap, not a wheel change: the TD04 frame does not accept TD05H internals. The manifold, oil lines, and downpipe all change. We can build the TD05H for you; the installation work is on the car side.
Start at repair.theboostlab.com, photograph the tag, drain the oil passages, cap the openings, and double-box. Ship to Boost Lab, Inc., 37833 Pineapple Ave, Unit A, Dade City, FL 33523.