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Full-Race Big Runner Twin Scroll Turbo Manifold (Non-AC) Mitsubishi Evo 4-9 4G63

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Product Description

Full-Race is proud to announce the release of the long awaited Mitsubishi Evo GT42R Twin Scroll Turbo Manifold. This manifold is Full-Race's answer to the most competitive market in the sport compact industry. Starting with a blank sheet of paper, utilizing years of race winning experience and new ideas, Full-Race engineers designed the Big Runner Twinscroll Manifold from the ground up for BorgWarner S400SX and Garrett GT42R. Combining the ultimate performance and durability with Full-Race's legendary craftsmanship, this manifold can produce more power than any other configuration on the market and is sure to stand up to even the most demanding Evo enthusiasts. 

Click on thumbnail pictures above for larger images 

Full-Race Mitsubishi EVO Twin Scroll Turbo Manifold features:

  • Thick wall stainless steel construction
  • Precision robotic TIG welding
  • True twin scroll design spools the turbo faster with better VE and more power from idle to redline
  • Lifetime Warranty

About Twin Scroll: 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!

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