Project Toyota Supra MKIV, Part 4: Turbo components


Precision's Competition Engineered Aerodynamics (CEA) 66mm turbine is a 76 trim wheel.  The fact that this is replacing a much larger GTS turbine from my previous setup means the response should be vastly improved from this alone.


One of the hardest decisions to make was with the exhaust housing.  After several discussions with my engine builder, the guys at MKC and Precision themselves, I was confident to go with a divided 1.15 A/R housing.  I felt this would give an engine response similar to an open .96 A/R.  And, having ridden in a MKC-built Supra running an open .96 A/R Precision 6768, I was fine with that setup’s response for street use.  The V-band discharge is 3 5/8-in. 


The majority of the cost of this expensive turbo is in the CHRA, or “Center Housing Rotating Assembly”.  This one is oil and air cooled, featuring the dual ceramic ball bearing option, which will not only give us the best spool-building characteristics, but also the best transient response between shifts. 


When it comes to intake manifolds, the Hypertune is something else.  The 6061 T6 billet aluminum flanges are fully CNC machined on their Mori Seiki and Makino CNC machines.  The firm offers stock-size runners as well as large-port runners, the latter of which is denoted by the red runners you see here.  Given our power goals we believe the larger runner manifold was the best choice.


This is what you want to see inside a quality intake manifold—velocity stacks!  These help the air maintain a high velocity as it enters the engine.  Hypertune also reports this manifold was designed for equal flow in each cylinder. 


Hypertune supplies its intake manifold with plenty of taps for different vacuum lines and sensors to be attached, as well as the idle control valve.


On the left is the modified, “bubbled” stock intake manifold and HKS fuel rail I used to run.  Compare that intake manifold with the Hypertune, and the difference is crazy.  Hypertune’s plenums are formed using a hydroforming process unique to Hypertune, and are designed to flow air evenly to each cylinder.  And, while bigger, the Hypertune setup still saves 5 lb over the factory setup.

To stay up to date with Hypertune's latest products and projects, visit the highly active Hypertune Facebook page. 

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