How much HP does a S55 have?
The BMW S55 engine delivers between 425 to 493 horsepower and 406 to 443 lb-ft of torque, depending on the model. The S55 engine comes with larger MHI turbos good for roughly 700HP (approximately 580whp)with supporting modifications. A number only achievable with upgraded turbos on the N54.The BMW S55 engine is a high performance version of the N55 made by BMW M GmbH, which is used by the F80 M3, F82 M4 and F87 M2 Competition/CS.The B58 is the better everyday choice—reliable, smooth, and more affordable to maintain. The S55 delivers sharper performance and true M-car excitement, but it comes with higher running costs and more demanding maintenance.The move to forced induction did mean that the S55 was rather better endowed than the S65 in the torque department. Where the naturally aspirated V8 had to make do with 295lb ft, the same as the N55, the twin-turbo S55 develops a meaty 406lb ft from 1850-5500rpm, giving it some monster mid-range punch.
What is the weakness of the S55 engine?
Common issues with the BMW S55 engine include high-pressure fuel pump failure, rod bearing wear, turbocharger problems, overheating, and rough idling. Regular maintenance can help prevent some of these issues. The S55 is a very strong engine but still has known issues such as: Crank hub failure (on aggressively tuned cars) Valve cover leaks. Cooling system maintenance.While most BMW S55 engines are reliable, some common issues may arise, such as crank hub failure, charge cooler problems, and gasket leaks. These are often due to subpar materials or neglected engine maintenance. If you experience rough idling or engine fault codes, you might be dealing with crank hub failure.
Is the S55 faster than the B58?
As you can see, now the B58 is really getting somewhere. It is making significantly more power than the S55 right up to 5800RPM, and over 100HP extra at 2500RPM. The only point at which the S55 is now beating the B58 is in a narrow band between 6000 and 6600RPM, and still only by a maximum of 17hp. The S55 engine is a 3. L twin-turbocharged inline 6-cylinder powerhouse with a bore of 84mm, a stroke of 89. Its rotational internals are built for extreme performance, featuring a forged crankshaft, forged connecting rods, and an upgraded valvetrain for enhanced durability.Energy efficiency comparisons between these engines reveal BMW’s progress in powertrain development. The S58 achieves approximately 8-10% better fuel economy than the S55 under comparable driving conditions, despite its higher power output.
What’s better, N55 or S55?
The N55 has better sound and more character as an engine, too, and the competition has more expensive parts to replace other than the engine. In stock form, the N54 offers slightly better performance than the N55, with robust aftermarket support allowing for extensive tuning and modifications. The engine’s overall performance makes it a favorite among enthusiasts.