If you are in the turbocharging and chasing horsepower game, you have probably heard the whispering Holset HX30 Super, especially the very desirable 6 cm km Exit house version. Compact, responsible, and the signature throat produced with stability, this little turbo packs serious traction.


What Is the Holset HX30 Super?


The HX30 is part of Super Holeset's Mid-Frame TurboCharger Lineup, mainly designed for commercial applications. However, it has quickly found motorcycling and viewing circles for its robust design and impressive coil properties. Unlike Store Holset brothers, such as HX35 or HX40, the HX30 is aimed at a small offset motor and sharp reaction.


Mainly involved:


  1. Compressor Inducer: ~ 44 mm
  2. Turbine XDUUSER: ~ 49 mm
  3. Journal bearing (although ball-bearing hybrids are present)
  4. T3 flangs Edge (standard on standard)
  5. Internal waste option
  6. 6 cm exhaust housing


Why the 6cm² Housing Matters


The 6 cm turn turbine housing is a magical chutney here. Most HX30 have 7 cm out or large turbine houses, which are better for high-end power, but sacrifice low-end reaction. The Unit of 6 cm Knit Tightens Things, dramatically improves the spool time, and makes it ideal for this:


1.6L to 2.2L motor
Drift builds
Hill-climbers and Autocross
Responsible road layout


Expect a full boost around 2800-3200 rpm on the 2.0L engine with the right setting a sweet space for both daily driving and aggressive track use.


Real-World Applications


Tuner and manufacturer love the HX30 Super for the balance. It can comfortably support up to 350 hp with the right support modes, but it doesn't seem dull or large for small engines.


Popular platform:


  1. Mazda Miata (No/NB with Turbo Kit)
  2. The Honda B series and K-series switch
  3. Toyota 4age and 3sge Build
  4. Nissan SR20TT (mild upgrades)
  5. BMW M42/M44 Turbo converting


Pros and Cons


Professionals:


Fast rewind with 6 cm
Holeset reliability (they have been known for working hard for years)
Cheaper than Garat/Borgavarner
Reaction Exploration for Construction


Lack:


Rare - especially a 6 cm km house
Journal bearing (slightly higher than ball bearing options)
400 hp is not ideal for targets


Final Thoughts


Holset HX30 Super with 6 cm Guse exhaust house is a turbo that turns over the weight. Whether you are building a road-friendly monster or a time attack machine, it is a responsive and cost-effective solution that refuses to compromise performance.


Just be warned - once you get the taste of that coil, you can't go back.