Full-Race Honda/Acura K-Series Twin Scroll Turbo Manifold

Full-Race Honda/Acura K-Series Twin Scroll Turbo Manifold

Regular price $1,257.00 Sale

Best Turbo Manifold in the market.  The fastest racers uses Full Race products.

Full-Race has spent years working with Turbo VTEC engines - one thing weve clearly learned is that these engines love to breathe through properly executed twinscroll turbo setups! Twinscroll systems seperate interfering exhaust pulses, allowing for faster spool while eliminating high pressure reversion. We designed the K-series twinscroll to take full advantage of this and spool medium to massive turbos faster than any other design on the market - carrying torque throughout the entire powerband. This produces an exhilirating experience for a built street/road race car or a high-boost drag race application (same manifold & WG setup, just varying turbo size). We believe the K-series twinscroll to be the ultimate high power turbo manifold for the K-series RSX and EP Civic or swapped EG / EK / DC.

Ideal for demanding applications which require huge power output without sacrificing spool and response, this turbo manifold is engineered to break horsepower and ET records. It represents the state-of-the-art in high power turbocharged K-Series performance. (photos courtesy of Franklin from avid)

Application Notes:
  • (2) 44mm TiAl wastegates are recommended for high boost
  • Available without wastegate flanges for BorgWarner EFR internal-WG turbos
  • Can fit up to 6" inlet GT4508R or BorgWarner 82mm S400SX
  • this manifold can support power levels from an ultra responsive 400whp to an 1100+whp drag car.
Key design features include:
  • The merge collector creates a turbulent free area for the exhaust gasses to enter the turbine housing in even pulses at high velocities.
  • Robotic TIG welding for ultimate strength and longevity.
  • Flange surfaces machined flat ensuring a perfect seal.
  • ProStreet manifolds are CAD/CFD designed.
Twin Scroll turbo system design addresses many of the shortcomings of single scroll turbo systems by separating those cylinders whose exhaust gas pulses interfere with each other. Similar in concept to pairing cylinders on race headers for N/A engines, twin scroll design pairs cylinders to one side of the turbine inlet so that the kinetic energy from the exhaust gases is recovered more efficiently by the turbine. For example, if a four-cylinder engine’s firing sequence is 1-3-4-2, cylinder 1 is ending its expansion stroke and opening its exhaust valves while cylinder 2 still has its exhaust valves open (while in its overlap period, where both the intake and exhaust valves are partially open at the same time). In a single scroll AKA undivided manifold, the exhaust gas pressure pulse from cylinder 1 is therefore going to interfere with cylinder 2’s ability to expel its exhaust gases, rather than delivering it undisturbed to the turbo’s turbine the way a twin scroll system allows.

The result of the superior scavenging effect from a twin scroll design is better pressure distribution in the exhaust ports and more efficient delivery of exhaust gas energy to the turbocharger’s turbine. This in turn allows greater valve overlap, resulting in an improved quality and quantity of the air charge entering each cylinder. In fact, with more valve overlap, the scavenging effect of the exhaust flow can literally draw more air in on the intake side while drawing out the last of the low-pressure exhaust gases, helping pack each cylinder with a denser and purer air charge. As we all know, a denser and purer air charge means stronger combustion and more power... but the benefits of twin scroll design don’t end there. With its greater volumetric efficiency and stronger scavenging effect, higher ignition delay can be used, which helps keep peak combustion temperature in the cylinders down. Since cooler cylinder temperatures and lower exhaust gas temperatures allows for a leaner air/fuel ratio, twin scroll turbo design has been shown to increase turbine efficiency by 7-8 percent (faster spool, quicker response) and result in fuel efficiency improvements as high as 5 percent. It is wise to size the turbine housing A/R larger than the single scroll turbine A/R typically used!