May of 2015, CorkSport launched its first high performance drop-in turbocharger for the Mazdaspeed platform. Fast-forward almost 4 years and CorkSport again is about to redefine what a stock flange turbocharger for the Mazdaspeed platform can truly be.
The original “CS Turbo” is now the CST4 to follow the turbo line-up that is soon to launch. The CST4 took a fresh approach to “big turbo” with all the included hardware, gaskets, and of course direct drop-in fitment. It removed the guess work for a quick and easy installation, but the benefits didn’t stop there. This “little big turbo” packs a punch for its compact TD05H-18G wheels.
With the CST5 and CST6 just around the horizon it would be easy to forget about the tried and true CST4, but don’t worry this Mazdaspeed Drop-In Turbo got some new love also. You will now have a EWG housing option for the CST4. You can pick it up in EWG setup from the start or if you already have a CST4 that you love, you can get the EWG housing kit to do the upgrade yourself.
Moving onto the CST5 & CST6 the possibilities for the MZR DISI have moved up significantly. What started as a single “bigger big turbo” has morphed into two “bigger big turbos” that, we feel, better provide for the various power goals of the community.
The CST5 bridges the gap between drop-in performance and big turbo power. The journal bearing CHRA uses a hybrid TF06-GTX71 wheel setup that provides more top-end than the CST4 with minimal spool and response penalty. Upping the big turbo feel is a 4in anti-surge compressor inlet which will require an up-sized intake system.
Unlike the CST6, the CST5 will be offered in both internally waste-gated and externally waste-gated setups. This provides you with the flexibility to setup your Mazdaspeed just how you see fit and both have been proven 520+whp on our in-house dyno and tuning courtesy of Will Dawson @ Purple Drank Tuning.
The CST6 redefines what the community thought was possible from the stock turbine housing flange, but first some details. The ceramic ball bearing CHRA uses a GTX3576r wheel setup that clearly out powers the CST4 & CST5, but that’s point remember?
The CST6 is a legit big turbo, spool will be later, but still sub 3900rpm for full boost, however a turbo setup like the CST6 is not intended for low-end response. If top-end power is your goal, the CST6 will deliver. In-house testing has pushed the CST6 to 633whp at a fuel limited ~33psi and 7900rpm redline.
Unlike the CST4 & CST5, the CST6 will only be offered in EWG setup.
In the coming months, we will be sharing more information about the CorkSport Turbo Line-Up; the design, the testing, and validation of each. For more information about the CST5 & CST6 along with the new EWG turbine housing option, check out these sneak peek pages.
Thanks for tuning in with CorkSport Mazda Performance.
-Barett @ CS