![]() The CST4 is 12% larger on the compressor inducer, and 21% larger on the exducer than the OEM K04. Shown in the image above, we have the CST4 on the left and the OEM K04 on the right. Next comes wheels, which is where the CST4 really shines. The OEM K04 turbo comes standard with a limited 270° thrust collar.ĭoes The CST4 Have Increased Airflow Over The K04? The CorkSport turbo also sports a performance journal bearing with a full 360° thrust collar, which is what allows the turbine shaft and compressor to spin freely. ![]() This is due to an upgraded center housing rotating assembly (CHRA) which has a larger center shaft and larger bearings than the OEM turbo. The CST4 continues to prove itself as one of the best bolt-on options coupled with the needed reliability to withstand the additional demands of chasing 400 WHP – something the KO4 cannot accomplish. Now let’s get back to what this means for the CST4 and K04. ![]() ![]() Before we dive into the dirty details, you might be craving more details on how a turbo works? You are in luck! Check out our white paper on the CST4 and what makes up the anatomy of a turbocharger, bone up on the importance of a “bolt-on” vs a “drop-in” turbocharger, learn the difference between an internal vs external wastegate and finally why the turbine wheel design/materials make a difference. ![]()
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