Blog RSS

An actuator might seem like a minor part, but it plays a vital role in controlling the boost output of the turbo. It diverts excessive exhaust gasses away and prevent turbine wheel from over-speeding, at the same time regulating compressor wheel speed. The principal parts in an actuator are the spring and diaphragm. Diaphragm in OEM actuator wears out more easily because steel absorbs more heat than Aluminum. With stock actuator, a complete actuator needs to be replaced when the diaphragm breaks. However, diaphragm can be replaced individually in a billet actuator, which is much more cost effective. Another advantage...

Turbochargers have two major sections one usually referred to as the hot side and the other as the cold side. Two main parts from the hot side are turbine housing and turbine wheel. In order to stand extreme heat, both of these parts have to be able to withstand high temperature. In this discussion we’ll be focusing on the turbine housing. Arashi turbine housings are made mainly with 5 types of ductile cast irons, they are SCH22, Stainless Steel, D5S, D2, and FCD(HiSiMo). SCH22 is basically the hardest cast iron steel among these 5, its hardness is 442 HBW and...

 What is the most effective way of upgrading to ball bearing turbo from a journal bearing turbo? The answer is – Arashi KBT Series! This is a must read if you still do not know about Arashi KBT Series. Our KBT series CHRA and turbocharger allows you to upgrade from journal bearing to ball bearing effortlessly. Without preparing new accessories and piping, if you’d like to upgrade the whole journal bearing turbo to a ball bearing turbo, you may do so with Arashi KBT turbochargers, simply swap your turbo itself and it gives you all the advantages of a ball...

There are different kinds of turbo configurations available on the market right now and today we’re going to focus on mainly the single scroll and twin scroll turbos. A turbocharger works by using exhaust gases from exhaust manifold that propels the turbine wheel which drives the compressor wheel to spin and compress air into the engine. So, for a single scroll turbocharger, all of the gases from the four cylinders go into a collector and feeds the gases into the turbine wheel. While the exhaust gases enter from various pulses, it causes interference when they collide into each other, reducing...

Setting actuator preload is important as it prevents any sort of boost leaking by shutting the flap nice and tight. We’re going to talk about how to set-up an actuator preload. First loosen the clevis locknut, remove the circlip that holds the rod to the valve, then while you push the wastegate valve arm of the flap so it closes the gate, turn the clevis a couple of times until it hooks onto the wastegate valve arm just right; that would be the starting point. From the starting point, you do 3 full turns of the clevis, or you can...