31. However, this makes the diffuser rather sensitive to engine speed . 32. Typically, long primary tubes resonate at a lower engine speed than short primary tubes. 33. With MIVEC, the " cam swap " occurs automatically at a fixed engine speed . 34. Most of that torque, by the way, is available at relatively low engine speeds . 35. The exhaust and fuel systems are then tested at a variety of engine speeds . 36. The 1956 French fiscal horsepower formula also took account of engine speed , measured in rpm. 37. It is commonly referred to as turbo lag and is experienced at lower engine speeds . 38. This activated a governor to keep the engine speed too low to activate the transmission. 39. Also throttle inputs, engine speed etc . are required. 40. Reducing internal friction has helped to add torque, or pulling power, at lower engine speeds .
