#EVO X 25 PSI STOCK TURBO HOW TO#

Luckily, on my Evo X, this isn’t an issue, but surge does occur under partial throttle when there’s a pressure differential between the charge piping and intake manifold. A bad enough surge can even damage the blades of the compressor wheel! Under these high power situations, surge can easily damage turbo bearings due to the added thrust load going through the compressor wheel.

In certain situations (think large turbos and small engines), this can occur at full throttle. That air then comes back through the compressor wheel, making an audible choo-choo-choo noise in the process. Without a blow-off or bypass valve, the air between the turbo and closed throttle body has nowhere to go and the compressor tries to squeeze it until it can’t anymore. This can happen in a variety of ways but the one most car folks are experienced with is when accelerating under boost and then getting off the throttle. This is a phenomenon that occurs when the turbocharger compressor wheel is creating more air mass than the engine can ingest. On partial throttle, lower revs, my Evo X has turbocharger compressor surge.

#EVO X 25 PSI STOCK TURBO HOW TO#

The Impossible Evo X: Part 2 – How to use a BOV to control compressor surge

Evo x 25 psi stock turbo