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Old 01-17-2013, 05:33 PM
namelessman namelessman is offline
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Originally Posted by tim330i View Post
See what is missing in the above list? The difference in the 320i and the 328i is the pistons. While both have a 10:1 compression ratio the 320i has a different part numbers for the pistons then the 328i. What that exactly means in terms of the ability to boost the turbo pressure and get 328 horsepower from your 320 is not yet known.

Stay tuned as we continue to sift through BMW's technical documents searching for an answer.
This effectively says that the 328i is a $2-3k engine tune over 320i from the factory. Is N20 just for US spec 320i or for Euro/Canadian 320i as well? I wonder if non-US folks have already figured out how to boost the 320i.
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