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Originally Posted by gtaste
Old tech? Individual Throttle butterfly, 8k redline.. The history of this S54 block is long and evolutionary. Tolerance is low so handbuilt is required which costs more (17k for the engine). This is not an engine for bread and butter models. Drive it and you will know. It takes some concentration to drive it smoothly.. I have to take a deep breath everytime it gets fire up before driving off. It 's not about engine displacement and hp it generates.. It's all about how it delivers the power. Most will hate S54 block in a family sedan. Trust me I have one and loving it. It's highly strung and feels brutal. But that's the trade off. I drove the e90 330i, it's smooth.. so smooth that I love it as well.. performance asides, it's still different...
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Well said. Don't forget to mention that the S54 has terrible fuel economy because it makes its power in stratospheric rpms and compensates for this and the relatively weak lower end torque output with very aggressive gearing.
Anybody who thinks the S54 would make an appropriate engine for a fairly mainstream sedan clearly hasn't driven an S54 powered car, and/or doesn't understand the mechanical limitations of the engine.