The BMW M4 has quickly become a legend in the performance car world, and just a week after its release, the first models were already hitting the streets and workshops, eager to reveal their secrets. Following up on initial reports about the F80 M3’s dyno performance, Racewerkz Engineering brought their brand-new Mineral White F80 M3 and Alpine White F82 M4 to the dyno for some real-world testing. The burning question on everyone’s mind: how much power does the M4 really make?
M4 Dyno Results: Underrated Power Confirmed
Just like the Yas Marina Blue M3 that underwent dyno testing previously, this Alpine White M4 emphatically demonstrated that BMW’s official horsepower figures for the F8X platform are significantly understated. Despite the less-than-ideal conditions of a hot and humid Southern California day, the M4 impressively registered 421whp (wheel horsepower) and 410wtq (wheel torque) using STD correction.
To further assess the M4’s performance and resilience, an endurance dyno test was conducted, consisting of five consecutive runs without allowing the car to cool down. This rigorous test aimed to observe how the M4 responded to heat soak conditions.
Unfortunately, the M3 was not dyno-tested at this time because its engine was still in the break-in period.
M3 vs. M4: Weight Comparison
An interesting aspect of this test was the weight comparison between the M3 and M4. Both vehicles were identically equipped, with the crucial exception of the M3 featuring the optional [02NK M Carbon Ceramic Brakes], while the M4 had standard brakes.
The detailed specifications and weights were recorded as follows:
2015 Mineral White M3 Specs:
- 0ZDB Driver Assistance Plus
- 0ZEC Executive Package
- 0ZLP Lighting Package
- 02MK M Double-clutch Transmission (DCT)
- 02NK M Carbon Ceramic Brakes
- 02VF Adaptive M Suspension
- 02VZ 19″ Black Wheel 437 M Mix Tire
- Fuel: Empty (no driver)
- Weight: 3562lb
2015 Alpine White M4 Specs:
- 0ZDB Driver Assistance Plus
- 0ZEC Executive Package
- 0ZLP Lighting Package
- 02MK M Double-clutch Transmission (DCT)
- 02VF Adaptive M Suspension
- 02VZ 19″ Black Wheel 437 M Mix Tire
- Fuel: 1/2 Tank (no driver)
- Weight: 3579lb
The results revealed that the M3, equipped with lighter carbon ceramic brakes, weighed in at 3562lbs, while the M4 was only marginally heavier at 3579lbs – a mere 17lb difference.
Enhancing the M3’s Stance with Modifications
Following the dyno and weight checks, attention turned to modifications. While the M4 remained in its stock configuration for the time being, the M3 was fitted with Macht Schnell spacers to improve its stance.
- Macht Schnell Competition Wheel Spacer Kit – 12mm (front)
- Macht Schnell Competition Wheel Spacer Kit – 15mm (rear)
- Macht Schnell 90mm Competition Stud Conversion Kit
The addition of these spacers provided the M3 with a more aggressive and visually appealing stance. Furthermore, the stud conversion kit makes wheel changes faster and simpler, particularly beneficial for track days.
Enhanced Stance: F80 M3 with Macht Schnell Spacers & Studs
Conclusion: M4 Horsepower Exceeds Expectations
The dyno testing of the Alpine White BMW M4 definitively confirms what many suspected: the S55 engine’s horsepower is significantly underrated by BMW. Achieving over 420whp on a dyno under less-than-ideal conditions is a testament to the engine’s robust performance. Furthermore, the minimal weight difference between the M3 and M4 underscores that both models offer exceptional performance in their respective body styles. With even minor modifications like wheel spacers, the F80 M3 can achieve an even more aggressive stance, further enhancing its appeal. Special thanks to Racewerkz for their contribution to this insightful comparison!
