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Originally Posted by Silvermike
I did some quick research and I found that the tune and pistons are the main differences between the 2 engines. I was wondering if it were possible to run a 328/228 map on a 320/220 successfully?
will it work? Is it going to be reliable? Has anyone done this?
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simple answer - no. The compression ratios are different and the 20is run lean.
HOWEVER, you can run a piggy back, like say JB4, with updated fuel wires and get great power out of the car, especially on some e85. But you will not be able to get close to the 328i tuned. Basically yes a 28i tune could work on a 20i because they are both N20s, but due to the factory maps and systems, you need some extra modifications.
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