The N52 six cylinder directly compared to the new N20 turbo 4 replacing it - 2012 328i vs. 2010 BMW 328i
This is not a new comparison as it was done previously with the F10 528
. Now time to see how far the N20 has raised the entry level (in the USA) 3 series game. Just by how much does it do that? Well, Insideline compared the 2010 3.0 liter N52 naturally aspirated six cylinder powered 328i to the new 2.0 liter N20 turbo four cylinder and the results are not all that surprising. The N20 328i ran the 1/4 mile in firstname.lastname@example.org. The N52 328i ran the 1/4 mile in email@example.com, fairly large difference for two motors rated at almost the same horsepower (240 for the N20 vs. 230 for the N52).
Clearly, the difference is greater than just 10 crank horses and considering we have seen stock N52 dyno's in the 189 wheel horsepower range and N20 dyno's in the 230+ range
that tells you where those 4 MPH through the traps are coming from. It is not only peak horsepower at work, as the N20 has a fatter torque curve as well. BMW underrated the N20 quite a bit, not that we are complaining. Full results below.
Stock 328i on 91 octane dyno: