Audi RS3 vs Mercedes-AMG A45 S: Ultimate Hot Hatch Showdown

In the fiercely competitive world of high-performance hatchbacks, few battles generate as much excitement as the clash between the Audi RS3 and the Mercedes-AMG A45 S. These two pocket rockets combine family-friendly packaging with supercar-like speed, advanced all-wheel-drive systems, and razor-sharp handling. Both models from 2022 represent the pinnacle of hot hatch engineering, but which one truly excels? This comprehensive review dives deep into their engines, acceleration prowess, chassis dynamics, interior refinement, and real-world usability to crown a winner.

Powertrain Showdown: Five-Cylinder Soul vs Turbocharged Four-Pot Fury

The heart of any performance car lies in its engine, and here the rivals diverge dramatically. The Audi RS3 boasts a unique **2.5-liter inline-five-cylinder turbocharged engine**, producing 294kW at 5600-7000rpm and 500Nm of torque from just 2250-5600rpm. This broad torque band gives the RS3 a muscular, accessible surge that feels explosive from low revs, paired with a distinctive warbling exhaust note that evokes classic rally cars.

In contrast, the Mercedes-AMG A45 S relies on a **2.0-liter four-cylinder turbo engine**, the most powerful of its kind, delivering 310kW at 6750rpm and 500Nm from 5000-5250rpm. It’s a high-revving beast that demands you work it hard for peak output, but its aggressive delivery and thunderous soundtrack make it addictive. Both use dual-clutch transmissions—the RS3 with a seven-speed unit and the A45 S with an eight-speed—but the Audi’s gearbox shifts with seamless precision, enhancing its refined character.

This table highlights the RS3’s lighter weight and lower-end torque advantage, setting the stage for intriguing drag races.

Straight-Line Speed: Drag Strip Dominance

Raw numbers only tell part of the story; real-world testing reveals the truth. Using a VBOX datalogger with launch control, the RS3 obliterated expectations, sprinting to 100km/h in just 3.5 seconds—faster than its 3.8-second claim and a clear edge over the A45 S’s consistent 4.0-second run. The Audi pulled ahead early, hitting 50km/h in 1.5 seconds versus the Merc’s 1.7, thanks to its torque flooding in sooner.

Despite the A45 S’s slight power edge, the RS3’s repeatability and lighter curb weight make it the drag strip king. In repeatable runs, the Audi felt more planted, with less wheelspin.

Handling and Dynamics: Precision vs Playfulness

Hot hatches shine on twisty roads, and both cars feature sophisticated all-wheel-drive systems with rear torque vectoring. The RS3’s updated chassis includes adaptive dampers and a rear torque splitter that actively distributes power to the outer rear wheel, reducing understeer and enabling playful rotation. Testers noted its hunkered-down stance, wide front tires (265/30 ZR19 vs 245/35 ZR19 rear), and neutral balance, making it the most driver-focused RS3 yet.

The A45 S counters with scalpel-sharp responses and Drift Mode for rear-wheel bias up to 100%. It’s eager and involving but can feel narrower and more fidgety over bumps. The RS3 edges ahead in composure, filtering road noise better and offering a more polished feel. In track tests, the Mercedes shaved seconds in some laps due to its agility, clocking 1:21.2 versus the Audi, but the RS3 felt more forgiving at the limit.

• RS3 Strengths: Adaptive dampers for superior ride, torque vectoring for neutral handling, quieter cabin.
• A45 S Strengths: Razor-sharp steering, Drift Mode fun, explosive top-end power.

Comfort and Daily Drivability: Refinement Matters

Beyond the track, these are hatchbacks for everyday use. The RS3 transforms here with its new damper setup, ditching magnetic ride for something plusher yet controlled. It’s quieter, with less tire roar, and its five-cylinder smoothness suits long hauls. The A45 S, while thrilling, transmits more road harshness and noise, feeling rawer.

Fuel economy reflects this: 12.7L/100km for the RS3 versus 13.4L for the A45 S in testing. Both offer practical boots, but the Audi’s cabin feels more spacious and premium.

Interior and Technology: Luxury Meets Sport

Audi’s Virtual Cockpit and high-quality materials give the RS3 a tech-forward, upscale vibe with ample space. The A45 S impresses with AMG-specific touches and a bucket-like driving position, but its cabin feels tighter. Infotainment is intuitive in both, though the RS3’s haptic controls shine.

Pricing and Value: Which Delivers More Bang?

In markets like Australia and the UK, the RS3 starts slightly higher but justifies it with refinement and the five-cylinder exclusivity. The A45 S tempts with raw power, but the Audi offers better long-term usability. Resale and maintenance favor neither decisively.

Key Test Metrics Comparison

Frequently Asked Questions (FAQs)

Which is faster: Audi RS3 or Mercedes-AMG A45 S?

The RS3 is quicker in 0-100km/h tests at 3.5 seconds versus 4.0 seconds for the A45 S.

Is the Audi RS3 more comfortable for daily driving?

Yes, its adaptive dampers and quieter cabin make it superior for everyday use.

Which has the better engine sound?

The RS3’s five-cylinder warble is more cultured; the A45 S is louder and more aggressive.

Can the A45 S drift?

Yes, Drift Mode allows rear-wheel bias for controlled slides.

What’s the fuel economy like?

RS3: 12.7L/100km tested; A45 S: 13.4L/100km.

Final Verdict: A New Hot Hatch Champion

The 2022 Audi RS3 emerges victorious in this showdown, blending blistering speed, superior handling, unmatched refinement, and that irresistible five-cylinder character. While the Mercedes-AMG A45 S remains a ferocious alternative for those craving raw aggression, the RS3 proves more complete— the ultimate super hatch for enthusiasts who demand track thrills without sacrificing daily comfort.