Mercedes-AMG A45 S: 416 BHP, 0-62 In 3.9s, 4 Driving Modes

The Mercedes-AMG A45 S stands as a benchmark in the hyperhatch category, blending supercar-level power with practical hatchback versatility. Powered by a hand-built 2.0-liter turbocharged four-cylinder engine producing up to 416 bhp, it achieves 0-62 mph in just 3.9 seconds, outpacing many traditional sports cars.

Engineering a Powerhouse: The M139 Engine

At the heart of the A45 S lies the M139 engine, AMG’s masterpiece of downsized performance. This 2.0-liter unit delivers an astonishing 208 bhp per liter, making it the most powerful series-production four-cylinder ever. Twin-scroll turbocharging with up to 26 psi of boost, reinforced pistons, and specialized bearings ensure durability under extreme stress, proven in rigorous testing equivalent to other AMG powerplants.

The engine’s responsiveness shines across rev ranges, though milder modes temper its ferocity for daily driving. In Sport+ or Race, it unleashes full fury with sharp throttle mapping and explosive torque up to 369 lb-ft.

Drivetrain Innovation: 4MATIC+ and Drift Mode

Mercedes’ 4MATIC+ all-wheel-drive system revolutionizes traction and dynamics. Fully variable torque distribution—from 100% front to 100% rear—uses sensors for yaw, steering, and throttle to optimize grip. The electronically controlled rear differential enables precise cornering, allowing controlled slides via Drift Mode, where rear bias promotes rotation without losing stability.

This setup provides neutral balance at high speeds, minimal body roll, and confident braking. On track, it corners flatter than rivals, with throttle-adjustable exits that reward skilled drivers.

Chassis and Suspension: Precision Meets Comfort

AMG Ride Control+ adaptive dampers offer selectable settings: Comfort for smooth cruising, Sport for balanced response, and Race for track sharpness. Steel springs and a rigid body shell minimize pitch and dive, ensuring planted high-speed stability.

Though firm on rough roads, the setup excels on twisty paths, with Michelin Pilot Sport 4S tires gripping tenaciously. Steering is direct and weighted, providing feedback without numbness.

Transmission and Acceleration: Lightning Shifts

The eight-speed AMG dual-clutch gearbox delivers seamless shifts in Comfort, rapid snaps in Sport+, and rev-matched downshifts with throttle blips for composed braking. Launch control propels the A45 S to 124 mph effortlessly, with linear yet ferocious acceleration.

• 0-62 mph: 3.9 seconds (S model)
• Top Speed: 168 mph (electronically limited)
• Quarter-Mile: Low 12 seconds, supercar territory

Design and Aerodynamics: Aggressive Stance

The A45 S boasts a muscular profile with 19-inch wheels, wide fenders, a prominent rear wing, and Panamericana grille. Facelifted models feature sleeker headlights and an AMG crest. Aerodynamic winglets and underbody panels enhance downforce, while large brakes (15.4-inch fronts) provide fade-free stopping.

Interior Refinement: Tech-Laden Cabin

The cabin merges luxury with sportiness: Nappa leather seats with AMG badges, carbon-fiber trim, and a flat-bottomed Performance steering wheel. Dual 10.25-inch screens run MBUX infotainment with AMG menus for tuning modes and telemetry.

Though some plastics feel budget, the layout is driver-focused. Rear space suits adults for short trips, with a 343-liter boot expandable to 1,057 liters.

Practicality and Ownership: Beyond the Thrills

Despite its ferocity, the A45 S handles family duties with ISOFIX points, a usable boot, and refined Comfort mode. Fuel economy averages 28-34 mpg combined, aided by a particulate filter. Servicing via Mercedes’ network ensures reliability, though premiums apply.

Standard kit includes adaptive cruise, blind-spot assist, and wireless charging. Options like the Performance Pack add bucket seats and dyno data logging.

Rivals Comparison: How It Stacks Up

The A45 S edges rivals in raw power and versatility, though some prefer the RS3’s subtlety or Type R’s engagement.

Track Performance: Hyperhatch Unleashed

On circuits like Hockenheim, the A45 S shines: neutral poise, unbreakable front grip, and playful rear. Drift Mode enables big slides, while Race mode sharpens everything for lap records. It’s more forgiving than pure rear-drivers, suiting varied skill levels.

Pros and Cons

• Pros: Insane acceleration, advanced AWD, customizable dynamics, premium interior
• Cons: Firm ride on poor roads, high price, less ‘pure’ than FWD rivals

Frequently Asked Questions (FAQs)

Is the Mercedes-AMG A45 S worth the premium price?

Yes, for those seeking unmatched power and tech in a hatchback; rivals offer value but lack its extremes.

How does the A45 S compare to the Audi RS3?

The A45 S has more power and Drift Mode; RS3 feels more polished daily.

Can the A45 S handle track days?

Absolutely, with Race mode and optional packs for sustained abuse.

What’s the fuel economy like?

Expect 28-34 mpg; efficient for its output.

Is it practical for families?

Suitable for small families with adjustable modes and space.