IndyCar push-to-pass is a driver-controlled system that gives a temporary increase in engine power for overtaking on road and street courses. When the driver presses the button, the engine control system allows higher turbocharger boost pressure, sending more air into the engine so more fuel can burn each second. The result is a short burst of extra horsepower that can help a trailing car accelerate out of a corner, pull alongside, and complete a pass.
It matters because the system connects physics, engine design, and race strategy in one visible moment.
Key Facts
- Power is the rate of doing work: P = W/t.
- More boost pressure increases the mass of air entering the engine, which can increase power when matched with more fuel.
- Force, mass, and acceleration are related by F = ma.
- Aerodynamic drag grows with speed squared: Fd = 1/2 rho Cd A v^2.
- The power needed to overcome drag grows roughly with speed cubed: Pdrag = Fd v.
- Push-to-pass is limited by total available seconds per race, so using it early reduces the amount left for later battles.
Vocabulary
- Push-to-pass
- A driver-activated IndyCar system that temporarily increases turbo boost and engine power to help with overtaking.
- Turbocharger
- A device that uses exhaust gas energy to spin a compressor that forces more air into an engine.
- Boost pressure
- The pressure above normal atmospheric pressure that pushes extra air into the engine intake.
- Throttle response
- How quickly the engine changes power output after the driver changes the throttle input.
- Aerodynamic drag
- The resistive force from air that acts opposite a vehicle's motion and increases rapidly with speed.
Common Mistakes to Avoid
- Thinking push-to-pass gives unlimited speed, which is wrong because it is limited by available seconds, traction, gearing, and aerodynamic drag.
- Assuming extra boost instantly guarantees a pass, which is wrong because the driver still needs track position, timing, tire grip, and space to complete the move.
- Ignoring drag at high speed, which is wrong because drag increases with speed squared and can absorb much of the extra power on long straights.
- Using all push-to-pass time early in a race, which is usually poor strategy because later restarts, defenses, and final laps may be more valuable.
Practice Questions
- 1 An IndyCar has 150 seconds of push-to-pass available in a race. If the driver uses 12 seconds on each of 5 overtaking attempts, how many seconds remain?
- 2 During push-to-pass, a car's engine power increases from 700 hp to 760 hp. What is the percent increase in power?
- 3 A trailing driver is 0.4 seconds behind entering a long straight, while the leading driver still has plenty of push-to-pass time available. Explain why activating push-to-pass may still fail to produce an overtake.