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Push-to-pass

Push-to-pass is an aid system employed in various open-wheel series, enabling drivers to temporarily boost their engine's power output by pressing a button on the , which increases boost pressure and engine RPM for a limited duration to assist in passing maneuvers or . Originating in the in 2004 as a means to enhance on-track action by providing a strategic power advantage, the system was adopted by the in 2009, where it delivers approximately 60 horsepower of additional power available under green-flag conditions following initial start/restart procedures. Since 2024, push-to-pass in the NTT —used exclusively on road and street courses—has been complemented by a system providing an additional ~60 , for a combined ~120 boost, while ovals utilize hybrid deployment without time restrictions. The system is regulated through the (EMS) and (ECU), with activation controlled electronically via signals from the timing and scoring beacon to ensure fair usage. Its parameters vary by event: road and street courses allocate 150-200 seconds total boost time (e.g., 150 seconds at St. Petersburg and , 200 seconds at Long Beach, , , , and others), with maximum bursts of 15 to 20 seconds per activation. It is available only under green-flag conditions, disabled during or flags, race starts until crossing the alternate start/finish line, and the or last three minutes of timed races, and may be deactivated for lapped cars on road/street courses to promote cleaner . Unlike Formula 1's (), which adjusts aerodynamics in designated zones, push-to-pass provides a power-based boost usable anywhere on the track without positional restrictions, though it increases fuel consumption and influences pit strategy. Over time, the system has evolved from fixed-use counts to time-based allowances, with refinements such as standardized activation without delays introduced in , raising turbo boost to 161 kPa and adding 200 RPM per use across road and street events. Beyond IndyCar, push-to-pass or similar systems appear in series like , , Super Formula, and , each adapting the core concept to their regulations for comparable overtaking opportunities. Notable controversies include a 2024 incident where drivers and were penalized for unauthorized push-to-pass use during starts, highlighting ongoing debates about its role in promoting exciting racing while maintaining equity. With the 2024 introduction of hybrid technology, push-to-pass has been enhanced and remains a defining feature of modern IndyCar racing, contributing to dynamic on-track battles.

Overview

Definition

Push-to-pass is an electronic system integrated into a race car's (ECU) that enables a temporary increase in power output, typically by 50-60 horsepower or an equivalent energy boost, specifically designed for maneuvers in . The core components include a driver-activated located on the , which signals the to initiate the power surge through predefined software mappings that adjust parameters. This process is supported by fuel or systems, such as the (), to deliver and sustain the boost without compromising overall race strategy or vehicle reliability. The activation is regulated via communication from race timing systems to the team's and , ensuring seamless and unmodified operation. Unlike aerodynamic systems such as (DRS), which reduce air resistance to gain speed, or Kinetic Energy Recovery Systems (KERS), which deploy electrical energy recovered from braking via batteries, push-to-pass focuses on direct enhancement of the or hybrid power unit's output through increased boost or fuel delivery. This distinguishes it as a power-centric aid rather than one reliant on external or stored energy recuperation.

Purpose

Push-to-pass is designed to facilitate overtaking in motorsports by granting drivers a temporary increase in engine power, creating a brief pace advantage when following closely behind another car. This system directly counters the challenges posed by aerodynamic "dirty air," the turbulent wake produced by leading vehicles that disrupts airflow over a trailing car's wings and underbody, reducing downforce and making it difficult to maintain speed or close the gap for a pass. By providing this boost—approximately 60 horsepower from the engine, or up to 120 horsepower when combined with hybrid assist as of the 2024 era—for short durations, the technology enables the pursuing driver to accelerate more effectively through compromised aerodynamics, thereby promoting more dynamic on-track battles. Beyond immediate passing assistance, push-to-pass serves broader strategic objectives in enhancing overall race excitement and increasing action, particularly in spec-series where vehicles feature standardized and engines that result in closely matched performance. In such environments, natural mechanical or setup differences are minimal, often leading to processional races with limited position changes; the system introduces an equalizer that rewards precise driving and tactical timing, encouraging aggressive maneuvers without altering core vehicle parity. This has been evident in series like the , where the feature balances competition by allowing drivers to deploy boosts strategically during key moments, fostering more engaging spectacles for fans and maintaining competitive integrity. The purpose of push-to-pass has evolved from its origins as an anti-stagnation in the , where it was introduced in 2004 to inject vitality into races hampered by aero dependencies, to a core strategic element in modern hybrid-era implementations. In the NTT IndyCar Series starting in 2024, the system integrates with hybrid power units—the hybrid assist providing approximately 60 horsepower via —which combine with the boost for a total additional 120 horsepower during overtakes as of 2025, transforming it into a multifaceted that not only aids passing but also influences management, energy deployment, and race-long tactics. This progression underscores its role in adapting to advancing technology while consistently prioritizing enhanced racing dynamics.

History

Origins

Push-to-pass originated in the in 2004, introduced as a driver-activated system to counteract processional racing caused by high aerodynamic dependency between cars. Developed by Racing in partnership with series officials, it temporarily increased turbo boost to deliver an extra 50 horsepower, usable in bursts of up to 40 seconds with a total limit of 60 seconds per race on non-oval courses. The feature debuted successfully at the season-opening , where Forsythe Racing driver employed it immediately off the line to pass polesitter and secure victory. This innovation stemmed from Champ Car's strategic push to elevate race excitement and passing opportunities, adding a layer of tactical to power deployment amid the series' challenges following the 1996 open-wheel split. By enabling drivers to choose optimal moments for the boost—such as during close battles—it aimed to foster more aggressive and viewer-engaging competition on road and street circuits. Early implementations demonstrated its value, with officials noting improved dynamics that helped revitalize event appeal. The concept quickly influenced other series, notably , which adopted a comparable overtaking aid called PowerBoost starting in its inaugural 2005–06 season. This power boost system on naturally aspirated V8 engines granted approximately 30 additional horsepower (from 520 to 550 ), with drivers permitted 4 uses in sprint races and 8 uses in feature races, each activation under specific and speed conditions to promote fair and strategic employment during pursuits. PowerBoost remained a staple through A1GP's final 2009–10 campaign, including with the switch to Ferrari-powered in 2008–09, underscoring push-to-pass's role in enhancing global accessibility.

Adoption and Evolution

Following the 2008 merger between the Indy Racing League and , which unified American open-wheel racing under the banner, push-to-pass was standardized in the starting in 2009 to enhance opportunities on road and street courses. Initially, the system provided a modest power boost of 5-20 horsepower, activated for limited durations varying by event—typically 30-40 seconds total per race or stint—to assist drivers during passing maneuvers without dominating race strategy. Over the subsequent years, refinements emphasized strategic depth; by 2015, rules shifted from event-specific or stint-based allocations to a standardized total of 200 seconds of usage per race, with a maximum 20-second activation per deployment, encouraging more calculated deployment across the full distance. The system's adoption expanded internationally in the 2020s, adapting to diverse series while retaining its core overtaking focus. Super Formula introduced the Overtake System (OTS) in 2019, offering drivers up to 200 seconds of additional fuel burn per race to increase by approximately 5%, functioning similarly to push-to-pass but tied to fuel flow limits for balanced competition. In 2022, the (FRECA) implemented push-to-pass with a 25-horsepower boost limit, restricted to lap-based activations—requiring initiation at the start-finish line after lap one—and limited to five 15-second uses per race to promote aggressive yet controlled passing in junior formulas. Recent evolutions integrate push-to-pass with , while addressing enforcement challenges. IndyCar's 2024 hybrid energy recovery system added a 60-horsepower electrical boost, combinable with the traditional 60-horsepower push-to-pass for a total of over 120 horsepower on demand during road and street events, marking a -era enhancement to the original concept. Formula E debuted Attack Mode in 2018 as a zonal variant, granting a temporary 25-kilowatt (about 34-horsepower) power increase activated by entering a designated track zone up to twice per race, diverging from button-based systems to add positional strategy. Looking ahead, Formula 1 plans to replace the (DRS) with Manual Override Mode (MOM) in 2026, delivering an on-throttle battery power surge when within one second of the car ahead, akin to push-to-pass but integrated into the series' active aerodynamics and power unit for sustainable . Key rule adjustments have prioritized fairness and strategy, transitioning from fragmented limits to cumulative totals that reward tactical timing, as seen in 's 2015 standardization. The 2024 IndyCar season highlighted enforcement needs when faced penalties for deploying an unauthorized push-to-pass software variant—allowing extra uses on restarts—prompting stricter (ECU) monitoring and software audits to prevent manipulation and uphold system integrity.

Technical Aspects

Mechanism

Push-to-pass systems deliver their power boost primarily through electronic control unit (ECU) remapping, which adjusts engine parameters without requiring any physical hardware modifications to the vehicle. In the IndyCar Series, for instance, the ECU temporarily increases turbocharger boost pressure from a baseline of 1500 millibars on road and street courses to 1650 millibars during activation, enabling a surge of approximately 60 horsepower on top of the standard 550-700 horsepower output. This remapping optimizes fuel mapping and ignition timing in real time, allowing the engine to operate at higher crankshaft speeds—up to 12,200 RPM compared to the normal 12,000 RPM limit—while maintaining reliability within the constraints of the 2.2-liter twin-turbocharged V6 engine. In hybrid-equipped vehicles, such as those in the since mid-2024, the mechanism integrates additional energy deployment from a motor-generator unit (MGU) and , drawing stored for an extra that combines with the turbo-derived for a total overtake surge exceeding 120 horsepower. Fuel and energy management are tightly regulated to prevent overuse, with the enforcing limits on extra or draw based on a predefined total race allocation, typically 150-200 seconds of time across all activations. Real-time telemetry systems monitor usage via data links, automatically disabling the boost if limits are approached and logging all activity for series oversight to ensure compliance with capacities and energy recovery parameters. The system integrates seamlessly with the car's onboard electronics, including GPS and modules, to validate conditions based on status, processed through the without any mechanical interventions beyond initial software calibration. This software-driven approach, managed by INDYCAR-approved s like the McLaren Applied Technologies TAG-400i, ensures the boost is only available in permitted scenarios while preserving the integrity of the standard powertrain configuration. occurs via a button, which signals the ECU to initiate the remapped mode for the duration of the allowed push.

Activation and Limitations

Push-to-pass is activated by the driver pressing a dedicated button on the during eligible conditions, such as green-flag on and courses. The is enabled through the (), which receives signals from race control via CAN communication and timing transponders to confirm availability after the car crosses the alternate start/finish line following race starts or restarts. Race control provides an override for initial if needed, and drivers are notified via audible alerts and visual indicators showing remaining usage time and status. Usage is strictly limited to prevent abuse and ensure competitive balance, with a total allotment of 150 to 200 seconds per race depending on the event, delivered in increments of 15 to 20 seconds per activation. The time bank is non-replenishable during the race and cannot be reset. The system is automatically disabled during periods, full-course yellows, red flags, pit lane entry, and for the race leader; it may also be turned off for lapped cars at race control's discretion to avoid interference with leaders. To promote safety and fairness, the incorporates software locks that prevent manual overrides or unauthorized activation, ensuring compliance with predefined parameters. Following the 2024 Team Penske scandal, where manipulated software enabled improper use during restarts, enhanced oversight with improved software verification protocols, race control's remote disable capability, and detailed data logging for post-race audits to detect violations. Penalties for overuse or misuse include drive-throughs, stop-and-go sanctions, or disqualification, as demonstrated by the revocation of race results in the St. Petersburg opener.

Usage in Racing

IndyCar Series

Push-to-pass was introduced to the in 2009 as part of efforts by the Indy Racing League to enhance opportunities and improve race quality on road and street courses. The system provides drivers with a temporary power boost activated via a button on the , initially offering about 60 horsepower for limited durations to facilitate passing maneuvers. Over the years, it evolved alongside series regulations, with refinements to activation protocols and time allocations, culminating in 2024 with integration into the new hybrid power unit that adds approximately 120 horsepower (combined hybrid assist and traditional push-to-pass) on non-oval tracks. As of the 2025 season, no increase in hybrid power output was implemented. This synergy has amplified the system's effectiveness, allowing drivers to achieve peak outputs exceeding 800 horsepower during overtakes while maintaining strategic depth through time management. Under current rules, push-to-pass is available exclusively on road and street courses, where drivers receive a total allocation of 150 to 200 seconds per race, depending on the event, with per-push limits such as 15 seconds at St. Petersburg or 20 seconds at venues like Long Beach. The boost cannot be used on tracks, where passing dynamics differ due to higher speeds and , though the system remains disabled during race starts and restarts until specific conditions are met, such as passing the alternate start/finish line. Activation is available under green-flag conditions without proximity restrictions to the car ahead, and the () strictly enforces time usage without mid-race replenishment beyond the fixed total. The component, introduced in 2024, operates continuously for regeneration via braking but deploys in tandem with push-to-pass under the same time constraints on non-, adding layers of tactical decision-making for drivers. The system has significantly impacted racing in the by enabling critical overtakes that alter race outcomes, particularly on road and street circuits where passing can be challenging due to aerodynamic dependencies. In the 2024 , push-to-pass facilitated several key position changes during green-flag periods, contributing to a competitive field before the race's controversial conclusion. However, its misuse during qualifying and restarts at that event led to a major scandal involving , where software manipulation allowed illegal access to the boost, resulting in disqualifications for and from the race results, a 10-point deduction and grid penalty for , a $100,000 fine for the team, and suspensions for key personnel ahead of the 500. This incident underscored the system's role in maintaining competitive integrity while highlighting enforcement challenges. Overall, push-to-pass has boosted passing opportunities on non-oval tracks, fostering more dynamic races without compromising the skill required for sustained overtakes.

Super Formula

In Super Formula, the push-to-pass system is implemented as the , which was standardized in 2021 following a trial the previous year at Suzuka. This system allocates drivers a total of 200 seconds of boost time per race, with a maximum continuous activation of 100 seconds, activated via a on the to temporarily increase fuel flow to the engine for enhanced performance during attempts. Unlike some other series, the OTS allocation does not replenish based on position gains, requiring strategic management of the fixed duration. The is integrated into the championship's 2.0-liter direct-injection turbocharged engines, which power the chassis used since 2023. Activation enables richer mapping, effectively adding approximately 30 horsepower to the base output through higher burn rates, providing a measurable straight-line speed advantage without altering other vehicle parameters. This -limited approach emphasizes conservation, as excessive use can impact overall race due to the series' fixed fuel loads. To promote more dynamic racing, Super Formula adjusted rules in 2023, including circuit-specific cool-down periods after activation—such as 120 seconds at and Motegi—to encourage bolder usage while maintaining balance. Additional changes removed flashing indicator lights during activation to prevent defensive blocking tactics, with remaining time displayed via steady lights on the car's roll hoop for transparency and fairness. These modifications, introduced alongside the SF23 chassis, significantly boosted incidents across the season by facilitating closer racing without compromising equity.

Formula Regional European Championship

The push-to-pass system was introduced to the (FRECA) in 2022 as part of efforts to enhance overtaking opportunities in this FIA-sanctioned feeder series. Following an evaluation by the FIA in 2021, the system was integrated into the F3-T318 chassis to provide junior drivers with a tool mimicking overtaking aids used in higher-level series, thereby promoting more dynamic racing in a developmental context. Under the 2022 sporting regulations, push-to-pass delivers a temporary power boost activated by pressing a on the , with each driver allocated five activations per race, each lasting up to 15 seconds for a total of 75 seconds of additional . The cannot be used before lap 2, is disabled during periods, and requires drivers to cross the start/finish line to enable a new activation after such interruptions; violations result in penalties ranging from lap time cancellations to disqualification. This restrictive setup aims to encourage strategic use while maintaining fairness in the series' 30-minute sprint races. The introduction proved successful in improving on-track action, with overtaking incidents increasing notably in the debut season compared to prior years lacking such aids. For instance, at the 2022 round, drivers reported multiple successful passes facilitated by the boost, transforming what had been a processional event into one of the season's most competitive meetings. A related variant appears in the Eurocup-3 series, which uses a similar Tatuus-based for even younger drivers; ahead of 2024, its rules were updated to permit of unrestricted push-to-pass activation per race, diverging from FRECA's press-limited approach to further aid skill-building among juniors. This adjustment has elicited mixed feedback, with some drivers appreciating the added freedom for practice while others note potential overuse diminishing strategic depth.

Formula E

In Formula E, the push-to-pass equivalent is known as Attack Mode, introduced in Season 5 (2018/19) to promote by allowing drivers a temporary power increase without a proximity requirement to the car ahead. To activate it, drivers must enter a designated activation zone on the track once per race, typically providing an additional 25 kW of power for up to four minutes in the initial Gen2 era, raising total output from 200 kW to 225 kW. This zone-based activation adds a strategic layer, as drivers must deviate from the , potentially losing time, but gain a speed advantage afterward. During the Gen2 era (Seasons 5–8), Attack Mode evolved with incremental power boosts to further encourage passing maneuvers; for instance, Season 6 increased the boost to 35 kW (total 235 kW), and Season 7 to 50 kW (total 250 kW). It significantly enhanced on-track action, with drivers noting more opportunities due to the power , particularly in races where strategic timing of allowed trailing cars to close gaps effectively. By Season 8, the feature contributed to dynamic racing, aligning with Formula E's goal of simulating combustion-era push-to-pass while adapting to electric constraints. In Season 11 (2024/25), Attack Mode was supplemented—and in some contexts evolved into—the mandatory PIT BOOST, a mid-race feature delivering a 10% increase (3.85 kWh) via a 30-second, 600 kW rapid recharge. This stationary boost, part of a 34-second , provides drivers with additional stored for the remainder of the race, shifting strategy toward pit timing while maintaining the series' focus on . Unlike traditional push-to-pass systems in internal combustion series, which adjust fuel delivery to engines, Attack Mode and PIT BOOST in rely on software-controlled management to unlock higher power draw from the lithium-ion pack's stored . This approach demands precise thermal and discharge regulation to avoid exceeding limits, emphasizing and efficiency over fuel consumption.

Formula 1

In the , Formula 1 featured turbocharged engines where drivers could manually adjust boost levels via controls, providing temporary surges akin to early push-to-pass concepts for maneuvers. The 2009 introduction of the (KERS) marked a hybrid-era precursor, allowing drivers to deploy stored braking for up to 60 kW of additional to aid in passing or defending positions. By 2011, the (DRS) emerged as an aerodynamic aid, opening the rear flap to reduce when within one second of the car ahead, shifting focus from boosts to airflow management; however, discussions have persisted on reviving power-based systems to enhance racing excitement. For the 2026 season, Formula 1 plans to implement Manual Override Mode (MOM), a hybrid power boost system replacing , which activates when a driver is within one second of the leading car, similar to proximity rules in IndyCar's push-to-pass. MOM enables deployment of up to 350 kW from the MGU-K motor generator unit—roughly three times the current electrical output—delivering a 10-15% overall power increase through targeted hybrid energy release, with an extra 0.5 MJ available per lap beyond the standard 8.5 MJ recuperation limit. This mode is constrained by total battery energy reserves, preventing unlimited use, and can be activated by both pursuing and leading drivers in close proximity to facilitate attacks or defensive holds. The FIA's June 2024 announcement of MOM emphasizes its role in promoting closer racing within the 2026 sustainable powertrain framework, which prioritizes 100% sustainable fuels and balanced ICE-electric performance. Projections suggest it could enable more on-track overtakes by integrating with active aerodynamics for reduced dirty air effects. In May 2025, team principal endorsed the concept as a viable push-to-pass , aligning it with the series' push toward efficient, environmentally focused power units.

Other Applications

Defensive Use

In series such as the and Super Formula, push-to-pass—known as the in the latter—enables drivers to deploy temporary power boosts defensively when manually activated while a competitor is closely trailing, to widen the gap and preserve track position. This activation draws from the same limited allocation of usage time available for offensive maneuvers, usually 200 seconds total per race with maximum bursts of 20 seconds, ensuring strategic conservation across both purposes. A notable example occurred during the 2023 Indianapolis road course race, where activated push-to-pass in the closing stages to defend against , securing victory by just 0.4 seconds after recovering from an early spin via fuel-saving strategy that preserved his full 200-second allocation. In Super Formula, defensive OTS deployment similarly allows leaders to counter challengers by accelerating out of corners or on straights, maintaining competitive spacing without series-specific restrictions on timing beyond the overall cooldown periods of 100-110 seconds between uses. This defensive application introduces key trade-offs, as expending the power boost reduces the remaining bank for potential later overtakes, potentially leaving drivers vulnerable if race dynamics shift toward needing to attack. Since the introduction of the power unit, 's push-to-pass integrates with low-voltage system deployment for up to 120 kW additional power, enhancing defensive capabilities but requiring careful . In the by (FRECA), regulations further constrain such usage to prevent abuse by capping activations at five per race, each limited to 15 seconds, applicable from lap two onward and prohibiting resets under conditions to promote fair competition.

Qualifying and Practice

In most motorsport series employing push-to-pass systems, activation is prohibited during qualifying sessions to ensure a level playing field based on outright performance rather than temporary power boosts. In the IndyCar Series, for instance, push-to-pass is explicitly banned in qualifying, as outlined in the series rulebook, with its use restricted to road and street course races only. This prohibition was starkly highlighted in the 2024 St. Petersburg season opener, where Team Penske's Nos. 2, 3, and 12 cars were found to have illegally enabled push-to-pass during qualifying through a code tweak in their engine control units, allowing unintended power increases. As a result, Josef Newgarden was disqualified from pole position, Will Power from third place, and Scott McLaughlin received a 10-grid penalty; the incident prompted IndyCar to mandate ECU data logging and audits for all sessions to enhance enforcement. While qualifying restrictions are near-universal, push-to-pass is generally permitted in practice sessions to aid vehicle setup and testing, though with series-specific nuances. In , teams routinely activate push-to-pass throughout warm-up and practice sessions—such as the 30-minute pre-race warm-ups—to simulate race conditions and optimize and engine mapping without time limits, contrasting its regulated race usage. With the 2024 , practice allows unlimited energy deployment testing to evaluate integration effects. The (FRECA) allows push-to-pass in designated practice and test sessions, like the after-lunch portion of pre-season testing days, but imposes penalties such as lap time cancellations and session time additions for misuse; notably, it permits one pre-race activation before the formation lap to familiarize drivers with the system. Super Formula, however, confines its Overtake System (, equivalent to push-to-pass) strictly to race events, providing no allocation during qualifying or practice to prioritize pure lap times. These applications in non-race sessions enhance setup optimization by allowing engineers to evaluate power deployment effects on tire wear, balance, and overall lap times under controlled conditions. In practice, this facilitates data-driven adjustments that improve race-day performance without compromising competitive integrity. However, incidents like the 2024 IndyCar controversy underscore enforcement challenges, leading to stricter measures such as mandatory ECU telemetry reviews across series to detect unauthorized activations and maintain fairness. Looking ahead, Formula 1's planned 2026 Manual Override Mode (MOM)—a push-to-pass-like power boost replacing —aims to aid overtaking through additional electrical energy when close to the car ahead.

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