Power Range
Negative Pressure Supercharging power range is FROM 1000 - 4500 rpm
Negative Pressure Supercharging produces more torque over a wider rpm range which allows the vehicle to accelerate faster from 1000 - 4500 rpm than a high rpm engine that produces more peak horsepower but half as much low to midrange torque. Therefore, the more average torque the engine produces without increasing peak horsepower or rpm the faster it will accelerate the vehicle.
Peak Torque FROM 1000 - 3500 rpm
Negative Pressure Supercharging produces peak torque FROM 1000 - 3500 rpm and a huge increase in torque FROM 1000 - 3500 rpm at full throttle and part throttle. This produces very fast acceleration at full throttle and massive towing power at part throttle. The huge increase in torque produced even at part throttle allows the vehicle to accelerate fast, cruise or tow a trailer using less throttle which uses much less fuel.
Peak Horsepower at 4500 rpm
Despite the low peak rpm, Negative Pressure Supercharging produces faster
acceleration up to 4500 rpm than high rpm engines with more
peak horsepower but less average torque.
High torque low rpm engines produce faster acceleration, a lot more towing power, cost much less and use a lot less fuel on the street than high rpm horsepower engines
High rpm engines have a very narrow power band and produce a lot of peak horsepower to accelerate fast at high speeds on the race track but on the street they produce embarrassingly slow acceleration from idle to 4500 rpm, have no towing power, poor fuel economy and shake the vehicle apart at idle. This is because high rpm engines whether carbureted or fuel injected use a long duration cam to produce more horsepower at high rpm which produces no pulling power (torque) below 4500 rpm.
Therefore, for high rpm engines to improve acceleration on the street from idle to 4500 rpm, they need to use a range of expensive race parts such as 4-6 speed transmissions with an additional 1st gear, lower 4:1 differential ratio, long ram intake manifold and a 4000 rpm or higher stall torque converter that substantially reduces fuel economy but it allows the engine to quickly get into its high rpm power band. For high rpm engines to also improve towing, idle quality and fuel economy on the street from idle to 4500 rpm, they need even more expensive race parts such as fuel injection and computers.
Negative Pressure Supercharging idles so smoothly and produces such a huge increase in torque from idle to midrange with a carburetor it does not need all these expensive race parts to produce fast acceleration, more towing power and better fuel economy. However, a 4-6 speed transmission, lower 4:1 differential ratio, long ram intake manifold, fuel injection and computers may be used with Negative Pressure Supercharging to produce even faster acceleration, a lot more towing power and a lot more fuel economy than high rpm engines.
| Impulse Engine Technology
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PO Box 986 Randwick NSW 2031 Australia
Ph: (02) 9398 5544
Fax: (02) 9398 5644
International: Ph: +(612) 9398 5544
Fax: +(612) 9398 5644
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Inventor of Negative Pressure Supercharging
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