How to Increase the Horsepower of Your 4 Cylinder Car? Replacing Engine Components for More Power Install a new throttle body. The throttle body is the point that your intake meets the engine and the air is funneled into the intake manifold. In many applications, installing a throttle body with a larger diameter will allow even more air to flow into the engine, resulting in an increase of power. Throttle bodies are often held in place with four bolts and will require a new gasket to be placed between the throttle body and intake manifold when installed. Throttle body diameter is usually measured in millimeters. Swapping a 65 millimeter throttle body for a 75 millimeter one can dramatically increase the air that flows into the engine. You can purchase throttle bodies with larger diameters at many auto parts stores or online performance marketplaces. Make sure to purchase a throttle body designed for your specific year, make and model of vehicle.
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00:06 Install a new throttle body
00:52 Swap out your pistons for a higher compression ratio
01:29 Install more aggressive camshafts
02:08 Use headers to improve exhaust flow
02:46 Use a boost controller in turbocharged vehicles
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Creative Commons license: Increase-the-Horsepower-of-Your-4-Cylinder-Car (wikihow & authors)
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