Quote:
Originally Posted by KoenG
With this torque curve, I guess we also have an answer to the "boost threshold" question. The X3M is criticised for the lack of torque underneath 2500rpm, which is very visible here also! Nevertheless, for a 3.0 engine, the mid/top range is majestic!
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Yes indeed, it's seems pretty clear what they did with the S58 over the S55: Lower compression ratio paired with bigger turbos which makes for higher torque and horsepower numbers at the expense of a higher boost threshold and more lag. Not much "new tech" at work here.