8/8/2023 0 Comments Total engine airflow![]() ![]() This adjustment is performed by the use of a bypass valve which is between the engine and turbo and can release the exhaust gas without flowing through the turbo. The amount of air (pressure) forced into the engine is referred to as boost pressure and this can be adjusted by controlling the amount of exhaust gas which passes through the turbo. This compresses air and forces it into the engine allowing for higher outputs to be gained from the engine. Using the energy from the engine exhaust gasses, blades like those found in a windmill are turned with a compressor which attached on the same axis. Dependant on the Vehicle Type and muffler, it is possible to raise boost levels and gain big power increases. Turbos (more details later) use exhaust energy to produce power and so become a resistance in the exhaust system and so mufflers for turbo power cars are designed with less resistance compared to NA vehicles. Sound is also tuned to suit the application whilst giving enough to state its presence. Sports mufflers have smoother bends to increase the efficiency of the exhaust system and each system is tuned to the specific car so that sports cars can have efficient power all through the rev range, whilst sedan and wagon cars will have more emphasis on producing torque. The emphasis on the design is to reduce sound levels and gain torque at the lowest engine speeds. Stock mufflers tend to have tight bends and crushed areas in order to reduce production cost and layout reasons. The exhaust system plays a vital role in the exhaust emissions and sound levels of the car. Exhaust manifolds are a good example of this where it is possible to change the characteristics of the engine with the shape, joins and lengths of the manifold. By removing the muffler, exhaust resistance is radically reduced but engine torque is also reduces, adversely affecting launch and vehicle acceleration so it is necessary to have just the right amount of exhaust back pressure (resistance). The basics of exhaust tuning are in the increase of exhaust efficiency but it is not right to assume that the least resistance leads to the highest efficiency. Although these air box replacement type intake systems are able to offer increased air intake efficiency, the maintenance cycle is shorter than that of a stock air filter and so regular maintenance is a required to maintain optimum performance. A Super Power Flow kit removes the air cleaner box and replaces it with an open filter type assembly which is able to cope with the demands of higher levels of tuning. Super Hybrid Filter is a stock replacement type filter which uses the stock air cleaner box and replaces the filter for one which allows greater air flow thus increasing overall intake efficiency. HKS have designed and created Super Hybrid Filter and Super Power Flow as part of its intake line-up. It is like someone running a marathon wearing a gas mask! This makes the stock air intake system very inefficient from a performance point of view. However, the stock air cleaner is designed to reduce intake noise and to prevent the filter from being blocked over a long period of use under a variety of conditions. In order to increase intake efficiency, the most important thing is to remove anything that could become a restriction and guide air smoothly into the engine. ![]()
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