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The reason I ask is that I just exchanged my 2014 model for the 2017. It became immediately apparent to me that I was feeling more torque/power lower down in the rev range than the 2014. Once I put the BMS stage 1 on the 2017, I feel as though that low end improvement is gone. I know that the BMS N63tu stage 1 is a race tune so for racing you want the power higher up the rev range, however, on the street that is a different story.
I am just wondering if this is all in my head and that is why I was hoping someone had actually done a before and after test with actual figures.
I wonder if they re-mapped the fueling on the 2017, because I think the change between the 2014 and 2017 in stock is very apparent.
Then I read that BMW updated the N63tu engine to the N63tu2 and when you google that it mentions that they made the power/torque more available through more of the rev range.
So now I am wondering if the 2017 X50i actually comes with the N63tu2?
Any ideas?
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