1. What are the differences between Arashi journal bearing, Kuro ball bearing and KBT turbo?

Arashi Journal Bearing Turbos

Arashi journal bearing turbos is composed with standard journal bearing center cartridge type like MHI, Toyota, IHI,…etc. Features of journal bearing include durability and stability, it manages shock and high boost better and it’s more affordable than the other systems.

Kuro Ball Bearing Turbos

Kuro ball bearing turbos are like typical ball bearing turbos, they’re assembled with gt, gtx, gen ii, or g series wheel. They consume only half of the oil than journal bearing turbos and their spool is 15% faster than journal bearing turbos.

KBT Turbo

KBT turbo is our latest invention, it combines both journal bearing and ball bearing system by swapping journal bearing bush to ceramic ball bearing without having to change the oil and water line kits, however, a restrictor is required for ball bearing, it is included in the kit. KBT turbo is assembled with Japanese TD style wheels. Basically converting a TD style turbo into ball bearing turbo. Therefore has all the advantages combined together.

2. When do I need an oil restrictor?

We strongly recommend using an oil restrictor when you have a ball bearing system cartridge including our KBT turbos, it ensures optimal performance especially at high engine speed.

3. What are the things that I need to be aware of before installing turbocharger(s)?

Before you install the turbocharger...

a. Make sure oil feed bolts and banjo, oil feed hose, oil drain pipes, inlet pipes, and outlet pipes are clean, no carbon attached on them otherwise oil flow would be attached. Clean the parts using air gun if needed. This is very important because it will help the turbocharger to run smoothly and prolong its life. 

b. Check and be sure that nothing is attached on the passage of the exhaust manifold.

c. Inject some oil to the oil inlet hole then run the engine for few minutes.

d. Clean out any particles on the rear part of the air-intake pipe of your air filter.

e. If you find any problems after the turbocharger is installed, please check that the oil is not polluted by dust. Change the oil and make sure that the inlet and outlet pipes are clear, that nothing is affecting the oil flow.

f. Use selected oil on the engine.

g. ALL of the turbochargers are new unless otherwise specified, but each turbocharger has different life lengths due to different applications and settings.

4. What are the differences between external and internal wastegates and how do I choose which one to use?

External wastegate is located on your exhaust manifold and it vents exhaust gasses from the turbo to control boost pressure while the internal wastegate is built onto the turbocharger and its boost control rely on an opening valve in the turbine housing. It’s better to use an external wastegate when targeting higher horsepower with higher boost pressure.

5. How do I change the springs in Max GT billet actuator?

Each of the Arashi turbocharger is equipped with Max GT billet actuator. The diaphragm is enhanced for better performance and durability, and the casings are made of aluminum. It allows you to change the springs inside to reach your designated boost level. This upgraded actuator provides great boost response along with RPM range. Boost setting ranges from 0.2 – 1.79 bar, please make sure tuning is required. It also has a greater sensibility to handle boost pressures.

If you’re wondering about how to change the springs, here are the steps:

1. Loosen the locking collar using the c-spanner by turning it counterclockwise.

2. You will see this diaphragm.

3. Remove the top cap, locking collar, diaphragm, and spring.

4. Input springs according to your designated boost level; first input inner most spring, then the middle spring and finally the outer most spring, make sure each spring sits tightly on the lower spring support.

5. Put the upper spring support back.

6. Put the diaphragm back.

7. Then put the top cap along with the locking collar back in place.

8. With the c-spanner, tighten the locking collar by turning it clockwise.