Blog RSS

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...

If you’ve ever wondered about which type of actuator to choose among o-ring or diaphragm for your turbo, you’re welcome to join our discussion here. For Arashi Dynamics, we root for diaphragm actuators and we’ll discuss about our reasons later. Let’s start from the fundamentals of both type actuators. A piston moves up and down bypassing the top actuator housing sealed by o-rings; during its movement the piston rubs against the housing, creating friction. With diaphragm type actuator, the movement is created by injecting compressed air, pushing the diaphragm and piston down to open the flap of the turbine housing....

Turbine wheel is one of the most important parts in a turbocharger, it has various dimensions and forms, however, today we’re going to discuss about stock TD04 series turbine wheels. There are 4 different specifications of Mitsubishi/Arashi TD04 wheels, they are TD04, TD04L, TD04H, and TD04HL. TD04 has inducer of 47.2mm and exducer of 40mm; TD04L has inducer of 47mm and exducer of 41.3mm; TD04H has inducer of 52mm and exducer of 44.2mm, TD04HL has inducer of 52mm and exducer of 45.6mm.     Kindly note that each turbine wheel/turbine housing configuration requires different heat shield sizes. A typical TD04...

Although there is more than one possible cause for damaged compressor wheel, in this article we’ll be covering 3 main causes that we see most among our turbo repairs – shaft play, foreign objects, and failed blow off.Shaft play is one cause for compressor wheel damage, excessive side to side shaft play causes compressor wheel to hit the wall of compressor housing inlet and turbo gradually teared down if it wasn’t noticed in time. Make sure there is enough oil for turbo lubrication, poor or improper lubrication leads to shaft play and a broken shaft shank. Change of oil on...

A turbocharger compresses air, act as a compressor then force the compression into the cylinders of the internal combustion engine to raise the power output significantly. However, compressor surge happens when a compressor wheel is flowing more air than the engine can take in. This causes the excess air to back up in the intercooler piping and stall the air because it fights against the incoming air. This is why we offer ported compressor covers.Ported compressor covers, or anti-surged covers, are designed for the air to have convection and reduce compressor surge, with a ported cover it allows air pressure...