Quote:
Originally Posted by tn508s
So as a b58 guy why is this such a better engine?
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I’m not a b58 guy, I’m really an s65 guy who just happens to have s55, b58 and b48 engines
The n55 and b58 engines are both 3.0L single turbo I6 engines. The B58 has the advantage of learning from two other BMW turbocharged I6s - the n54 and n55 engines. The b58 has several improvements over the n55 such as a forged steel crankshaft, a closed deck block and an improved fuel system. These changes make the b58 more reliability than the n55 which had an open deck block, a cast crankshaft, and a weaker charge pipe setup. However, the n55 is a much freer revving engine and sounds better (less restricted exhaust setup), although sound quality is a subjective thing. In terms of tuning potential, the b58, due to its forged crank and closed deck, is capable of handling higher boost levels and, therefore, higher horsepower and torque output.