The ScienceofSpeed Twin Turbocharger System is the ultimate forced induction system for the NSX proving that with high performance can include high reliability with factory quality design.

factory quality performance
The system stands alone in design and construction to best represent what we feel is in essence the most factory approach to the design and execution of a turbocharger system for the V6 powered NSX. Unlike single turbocharger systems which merge the twin cylinder banks into one manifold, the ScienceofSpeed Twin Turbo System is designed like all parallel factory style turbocharger systems for V engines - with one turbocharger per cylinder bank. This allows the turbocharger to be optimally placed as close as possible to the engine's exhaust ports for best transient boost response, reducing the "boost lag" found with other turbocharger systems. In addition, separating the cylinder banks eliminates exhaust reversion seen in merged single turbo systems increasing turbocharger response and decreasing backpressure. The smaller turbochargers are optimized for low and mid range power, yet collectively allow a significant amount of exhaust volume to pass at high RPM to increase top end power yield.

factory quality fitment and reliability
In addition to performance, a significant emphasis was placed on designing a system that does not require permanent modification to the vehicle and emphasizes reliable performance. Positioning of the turbochargers was carefully analyzed to place the turbocharger in an optimal location with custom made thick wall forged stainless steel tubular manifolds while still allowing the turbocharger to fit within the constraints of the factory engine bay. Despite the two separate turbocharger systems, overall complexity has been reduced in comparison to other systems available. The turbochargers mounted above the oil pan eliminates the need to run external scavenge pumps - an important advantage compared to other single turbocharger systems which expose the engine's oil system to reliability of an electric pump. In addition, the turbochargers use reliable internal wastegates which reduce complexity, increase reliability, and promote a quiet livable exhaust sound. The design and layout is stealthy and mostly hidden. The engine bay looks mostly stock with the exception of the aluminum charge pipe - which may be covered for the ultimate sleeper presentation.

no compromise material and craftsmanship quality
An exceptional amount of emphasis was placed on quality to yield not only a fantastic looking system, but also one that is built to last. The turbocharger exhaust manifolds are fabricated from CNC machined stainless steel flanges for a precision fit with forged stainless steel tubular exhaust manifolds that have been designed as support members as well as to provide high velocity exhaust pulses to the turbocharger for maximum performance. The forged stainless steel tubular manifolds allow maximum thermal energy from the engine to transfer to the turbocharger turbines for best throttle response. The exhaust manifolds and turbocharger down pipes are all TIG back-purge gas welded for the most durable high quality construction. Several components have been custom designed by ScienceofSpeed - and the proof is in the details. An example is the custom machined NSX cylinder head adaptor fittings that efficiently feed the turbochargers with oil supply. You do not need to tee into the factory oil housing with fittings that do not fit and chance cracking the housing from vibration like used on other systems.

factory exhaust lay out
In addition to fitting within the factory engine bay - the system is also designed to retain the factory exhaust lay out - bolting directly to the factory catalytic converters and an existing factory style aftermarket exhaust. This is popular with customers who already have an aftermarket exhaust that they are happy with. This layout if compatible for gains up to 200 horsepower. For gains in excess of 200 horsepower, ScienceofSpeed offers a high performance exhaust designed for forced induction use that utilizes free-flowing 3" tubing and mufflers.

a powerfully flexible design
The ScienceofSpeed Twin Turbo System provides the most expandable system available. The system's twin turbochargers can produce up to a 200 horsepower gain on the factory 3.0L or 3.2L engine with no modifications (approximately 470-490 horsepower at the engine) and 300-450 horsepower gains (approximately 570-700 horsepower at the engine) with built strengthened engines. The use of twin turbochargers allows a significantly wide performance envelope. The system is ideal for a customer with a factory engine with goals of 400 horsepower all the way to a customer who is interested in expanding the factory engine with goals in excess of 600 horsepower.

The use of proven industry standard turbochargers result in a high quality and reliable system with excellent expandable options.

• ScienceofSpeed modified twin GT25R (for factory engines) or GT28RS turbochargers (for modified engines): ball bearing, oil lubricated, water cooled
• front & rear exhaust manifolds: CNC machined stainless steel flanges, forged stainless steel tubular TIG back-purged welded
• front & rear turbocharger down pipes with separated wastegate dump tubes: stainless steel tubular TIG back-purged welded
• liquid-air intercooler, heat exchanger, water pump, and reservoir
• aluminum TIG welded intake charge tubes (4)
• twin intake system with AEM Dry-Flow air filters
• TIAL 50mm vent to atmosphere blow-off valve
• high quality 4-ply silicone hose couplers, stainless steel smooth band clamps, and all required installation hardware
• turbocharger water cooling installation kit
• oil feed & oil drain installation kit with custom dual cylinder head feed fittings
• engine management system:
  1991-1994: AEM EMS
  1995-2005: AEM F/IC standard or ScienceofSpeed AEM EMS available upgrade optional
• high flow fuel pump:
  Walbro 255LPH HP fuel pump standard (up to 700 bhp) or  Aeromotive 340 LPH available upgrade optional (700+ bhp)
• fuel injectors:
  RC Engineering 750cc peak and hold or saturated injector set standard (up to 700 bhp) or  Injector Dynamics 1000 cc (700+ bhp) available upgrade option

• The ScienceofSpeed Twin Turbocharger System is compatible with factory catalytic converters and aftermarket exhaust systems with good flow. These systems typically have a 2.0-2.25" tubing size which will limit power to 400-450 wheel horsepower depending on the exhaust. For power levels above 400-450 wheel horsepower, ScienceofSpeed offers an exhaust system designed around 3.0" tubing which will support in excess of 650 wheel horsepower.
• 1991-94 (only) if factory catalytic converters will be used, these adaptor pipes are required. Not required if using with ScienceofSpeed FI Exhaust System and not required if the aftermarket header system being removed already has these adaptors in place.

specs