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Throttle Pressure and Throttle Response
From a technical standpoint, throttle response can be measured by how fast your engine can create vacuum through throttle pressure. The faster and higher the peak vacuum will be achieved in the intake manifold, the greater the pressure difference between the outside air and your engine. This pressure differential forces air to flow from an area of high pressure (outside air) to an area of low pressure (engine and cylinders), and the greater the pressure difference, the greater the pressure force and the faster the airflow. in the engine.
This is essentially how throttle response works. A number of engine modifications can be used to improve throttle response to a higher peak vacuum in the engine or a faster change in vacuum per throttle input… Some of these include:
1- Using undersized intake pipes and intake plenum runners to speed up the air flow in the intake system, allowing the engine to absorb all the air in it faster and create vacuum faster.
2- Adjusting the timing of the intake cam to open the intake valve as peak vacuum builds up inside the cylinder near bottom dead center.
3- Reducing overall intake system volume by using smaller manifolds, shorter vacuum lines, and more electrically operated (rather than vacuum operated) engine auxiliaries means less air noise from the intake system to create vacuum in the engine. manifolds to force fresh air in.
4- Using cam separation and cam overlap (when both intake and exhaust valves are open at the same time) helps the exhaust gases from the previous cycle pull in fresh intake gases for the start of this combustion cycle.
An interesting application of this concept is the G-Power supercharger kit for the BMW M3. The ASA Supercharger Power Kit focuses on responsiveness and efficiency rather than amazing peak power figures. The G-Power kit uses a very conservative boost supercharger by ASA and delivers just 4.4 psi of boost. Since the engine is already very high powered at 420hp, adding just 4.4psi of boost results in 500hp (a conservative estimate) and the combination results in as good as 560hp.
The focus of the G-Power kit isn’t just power figures, as instead of just providing a supercharger kit for the M3, G-Power has designed an entirely new intake manifold for the M3. Although the manifold is louder than the original M3 manifold (for more peak power since this is now a supercharged car), the narrower profile promotes higher air speeds to improve throttle response. Furthermore, the new manifold incorporates individual runners for each cylinder complete with trumpet-style inlets raised above the floor of the plenum, proven by fluid flow simulations to reduce boundary pressure differentials, reduce pressure inside the intake manifold and promote High air velocity which itself creates a high peak vacuum and a fast vacuum inside the manifold.
Although centrifugal superchargers typically exhibit a linear boost curve with engine rpm and thus produce power gains at low rpm, this supercharger’s combination of a redesigned intake manifold and new tune provides more than a 20% increase in torque across all engines. rpms, and with increased response.
This is in G-Power’s own words:
Air Duct: Sport air filter system, CAD-FEM flow optimized boost recooling system with air duct made of cast aluminum, high capacity air-to-air intercooler made of cast aluminum at the front of the car and a large volume air box made of. Aluminum cast, with 8 integral resonance induction pipes made of light polyamide, ensures optimal throttle response and perfect torque curve; Pneumatically controlled, boost control related to engine load; Boost level approx. 4 psi rel.
The G-Power kit comes in 3 power ranges corresponding to 4, 6 and 7psi of boost. The 7psi kit with their full titanium exhaust is capable of more than 580 hp and great response to match. Last but not least, the new G-powered M3 is capable of a 0-124 mph time of 2 seconds faster than the factory M3, a pace that puts the gap between the two cars at around 20 cars. Plus the G-Power will keep pulling up to 223mph with its unlimited speedometer!
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