The BMW M4 has quickly become a favorite among driving enthusiasts since its launch. Just a week after hitting the market, these high-performance coupes are already making waves. Following up on initial reports and dyno tests of the M3 sedan, we got our hands on a brand-new Alpine White F82 M4 to put it through its paces on our Dynojet dyno. The results? BMW might be seriously underrating the horsepower of these machines.
Surprising BMW M4 Horsepower on the Dyno
Despite warm and humid conditions, the BMW M4 dyno test delivered impressive figures. The M4 churned out a remarkable 421whp and 410wtq using STD correction. This mirrors the results we observed with the Yas Marina Blue M3 previously tested, further suggesting that the S55 engine’s true output exceeds BMW’s official numbers. This initial dyno run immediately highlights the potent performance packed into the BMW M4 horsepower figures.
To assess the M4’s resilience under stress, we conducted an endurance dyno test. This involved a series of five consecutive runs without cooldown periods to observe how the car handles heat soak. The data collected during this test is crucial for understanding real-world performance in demanding driving scenarios.
Unfortunately, the Mineral White M3 was not dyno tested at this time due to the engine not being fully broken-in. However, we did get valuable data on another key aspect: weight.
BMW M3 vs. M4 Weight Comparison
We weighed both the M3 and M4 to compare their figures. Interestingly, both cars had identical specifications, with the notable exception of the M3 being equipped with optional M Carbon Ceramic Brakes.
The 2015 Mineral White M3, featuring M Carbon Ceramic Brakes, Driver Assistance Plus, Executive Package, Lighting Package, M Double-clutch Transmission (DCT), Adaptive M Suspension, and 19″ Black 437 M wheels, weighed in at 3562lbs with an empty fuel tank.
Conversely, the 2015 Alpine White M4, equipped with the same packages and options but without the carbon ceramic brakes, and with approximately 1/2 tank of fuel, weighed 3579lbs.
The weight difference between the carbon ceramic brake-equipped M3 and the standard M4 was a mere 17lbs, with the M4 being slightly heavier.
Enhancing the M3 with Macht Schnell Spacers
Following the weigh-in, we proceeded with some aftermarket enhancements. While the M4 remained in its stock configuration, we installed Macht Schnell Competition Wheel Spacers and Stud Conversion Kit on the M3 to improve its stance and track readiness.
The Macht Schnell spacers provided the M3 with a more aggressive and flush wheel fitment, while the stud conversion kit facilitates quicker wheel changes, particularly beneficial for track days.
The initial dyno test of the BMW M4 horsepower confirms the impressive performance capabilities of this model, suggesting that BMW’s factory ratings may indeed be conservative. Combined with its lightweight construction and potential for further modification, the M4 is a formidable sports coupe right out of the box.
