BorgWarner S300SX 9180 aka S366SX (177281)
The S300SX 9180 is the original S366 performance turbo. This turbo put BorgWarner/Airwerks’ on the map due to it’s massive boost performance with excellent fitment and value. It uses a 7-blade Extended Tip compressor wheel w/ 66mm inducer & 91mm exducer rated at 82lb/min. 4″ Ported shroud Inlet, 3″ outlet compressor housing. Turbine side is a 80mm inconel turbine wheel which shares blade aero. Journal Bearing and Oil Cooled only (watercooling and BB CHRA not applicable). FULL RACE RECOMMENDS MODIFYING THE TURBINE HOUSING TO 3″ VBAND. (this allows for fitment identical to 40R, letting you swap between any t4 turbocharger with 3″ vband outlet and guarantees perfect fitment to Full-Race turbo kits).
- 3AN oil feed line is recommended. If -4AN or larger is used, an oil restrictor is required (just like GT turbos).
- Available with 90 degree compressor outlet
- *0.88 A/R Turbine Housing Included*
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 engines 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 cylinders ability to expel its exhaust gases,rather than delivering it undisturbed to the turbos 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 turbochargers 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 donï¿½t 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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