Diff I believe is due to power being quoted in ps and bhp
E46Fanatic;630427 said:I wonder if there is a difference in the US spec Z4 sDrive28i and Euro spec Z4 SDrive28i. Paul reports different output figures from the link 3er posted above.
"The second car in the BMW stables to receive the new N20B20 4-cylinder direct injected turbocharged petrol engine is the BMW Z4, in the sDrive28i model. The first model to get the engine was the BMW X1 xDrive28i.
In the X1, the N20B20 makes 245 horsepower at 5,000rpm and 350Nm of torque from as low as 1,250rpm, which is slightly less horsepower but a whole lot more torque compared to the engine it replaces – the 3.0 liter 6-pot that in “28i” tune makes 258 horses and 310Nm.
We expect the engine to be extended to other BMW models as well – there’s surely going to be an upcoming new 1-Series 128i, the F30 328i and perhaps even the F10 528i will become 4 cylinder powered."
http://paultan.org/2011/04/19/bmw-z4-sdrive28i-now-powered-by-n20-4-cylinder-turbo/