Throttle Body Size Calculator

The optimal throttle body size depends on your engine's displacement, target horsepower, and maximum RPM. Generally, you want to maintain air velocity between 250-300 ft/sec at peak power for best throttle response and power delivery.

Yes, an oversized throttle body can hurt performance by reducing air velocity at low RPMs, leading to poor throttle response and reduced torque. The goal is to size it appropriately for your power goals.

With multiple throttle bodies (like individual runner systems), each throttle can be smaller since the total airflow is divided among them. This often provides better throttle response than a single large throttle body.

A single throttle body is simpler and more cost-effective, while dual throttle bodies can provide better airflow distribution and higher flow capacity for high-performance applications.

Yes, turbocharged engines have different airflow characteristics due to forced induction. The throttle body sizing should account for the increased air density and pressure ratios from the turbocharger.

Most experts recommend keeping air velocity at or below 300 ft/sec at maximum power. Velocities between 250-300 ft/sec typically provide the best balance of power and throttle response.

These calculations provide a good starting point, but actual results may vary based on intake manifold design, cam timing, and other engine modifications. Always verify with dyno testing when possible.

Absolutely. The intake manifold design, runner length, and plenum volume all affect airflow dynamics and should be considered alongside throttle body sizing for optimal performance.