Both versions of the GLB employ a turbocharged 2.0-litre inline-4-cylinder engine. However, the AMG GLB35 version is enhanced to produce 302 horsepower between 5,800 rpm and 6,100 rpm, and 295 pound-feet of torque between 3,000 rpm and 4,000 rpm. These are gains of 81 hp and 37 lb-ft, respectively, over the GLB250's turbo engine.
The performance tuning doesn’t stop there. The AMG GLB35 has an AMG SpeedShift eight-speed dual-clutch automatic transmission, AMG Performance variable 4Matic AWD, and an AMG Sport Exhaust system. Dynamic Cornering Assist is a brake-based torque vectoring system, and drivers can calibrate the SUV’s dynamic behaviour using both the Dynamic Select and the AMG Dynamics mode settings.
According to Mercedes, the AMG GLB35 zooms to 100 kilometres per hour in 5.2 seconds, a full 1.7 seconds quicker than a GLB250. The official Natural Resources Canada fuel consumption rating for the AMG GLB35 is 11.2 litres per 100 kilometre in combined driving, up from 9.5 L/100 km for the GLB 250 4Matic. We averaged 10.8 L/100 km on our testing loop.
Eventually, you’ll need to slow down and stop. Therefore, an AMG High-Performance Braking System is standard on the AMG GLB35, sporting four-piston front calipers gripping 13.8-inch perforated discs. An AMG Ride Control adaptive damping sport suspension is also standard, along with Direct Steer, which is a variable steering system that is quicker to respond to driver input and lighter in terms of effort when you’re traveling at lower speeds.
Unsurprisingly, the AMG GLB35 emphasizes performance over daily-driving comfort. Unless you purposely quicken its pulse by choosing one of the more aggressive driving modes, the powertrain exhibits some lag in throttle response. Also, the DCT can seem a little confused and the performance brakes tend to grab and feel a bit uneven in urban driving settings. The ride is firm too, especially with the optional 21-inch wheels. On the highway, the hood flutters a little at speeds over 110 km/h.
Based on our experience, most people will be happier with a GLB250. It's not as fast, but based on our previous experience with this version of the SUV, it is better to use as a daily driver.
On the other hand, driving enthusiasts will delight in the AMG GLB35’s demeanour on a writhing mountain road. Switch to Sport+ mode, and this SUV transforms into quite a feisty little bugger. The engine responds to your right foot without delay, shifts are louder and sharper, and grip is excellent. The GLB’s small footprint and outstanding outward visibility make this Mercedes feel lithe and nimble, and the brakes stand up to repeated hard application with no hint of fade.
Overall, the AMG GLB35 is a blast to drive on twisty two-lane roads. We can’t think of another entry-level luxury SUV that offers this much fun while driving. However, you’re really gotta want a quick and small Mercedes SUV to put up with how firm, loud, and finicky the AMG GLB35 can be in all other driving situations.