Fredric The Great, a Look Inside the Papadakis Racing Scion tC of Fredric Aasbo

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A closer look at the heads combustion chambers shows the unshrouding done by Portflow.  Look at the stock valves.

The cylinder heads were worked over by Portflow Design.  The exhaust ports were fully ported with the super large intakes just receiving some work in the bowl area.  The stock valves are used and the valve seats receive Portflow’s super trick radius valve job.  The heads use stock cams or so we were told.

A large plenum fabricated intake manifold replaces the stock cast two stage intake manfold.  The custom fuel rail uses large injectors for E85 fuel.

Brian Kono of Afterhours Automotive designed and built the large plenum intake manifold and the tubular stainless turbo exhaust manifold that is designed for a twin scroll turbo.  The turbo is one of Borg Warner’s revolutionary EFR turbos. The turbo is an EFR 7670 with a 76mm compressor wheel and a 70mm turbine wheel.  The turbine is revolutionary, made out of a titanium aluminide alloy that is 50% lighter than a typical Inconel turbine wheel.  This super lightweight wheel greatly speeds spool.

The Borg Warner EFR 7670 is fast spooling and its internal wastegate and integral blow off valve greatly simplify the exhaust and charge plumbing.  Less weight, cleaner engine compartment and greater simplicity.  You can see the large internal wastegate here.

The compressor wheel is CNC machined from a near net shape forged billet.  This allows the designers to use thinner blades and a smaller hub section than your typical cast wheel.  This makes for a lighter wheel with better aerodynamics yielding better compressor efficiency.  The compressor has Borg Warner’s exclusive extended tip design where the fin tips on the wheels inducer extend into the compressor housings inlet.  This also results in faster spool.

You can see the integral blow off valve on the compressor housing here.  You can also see the built in boost control solenoid here as well next to the blow off valve.  Such simplicity!

The EFR turbo’s internal wastegate, BOV and boost control mean very simple and clean plumbing, all important for a race car.  Less weight, less to fail, more room to work on stuff.