Quote:
Originally Posted by atmosphericM
I see no reason why the BPC tune wouldn't do *almost* just as much for a SULEV 328i (N51 w/ 3IM) as it does for a 330i (N52 w/ 3IM) or a standard ULEV 328i with the 3IM upgrade (N52 + 3IM). The slightly lower compression ratio probably robs the tuned N51 of about 5 maybe 10 whp max, based upon my rough calculations, when compared to a tuned N52 with the same mods (3IM, intake, MILVS, headers, exhaust, etc.).
That said, only those at BPC really know what the difference in their N51 vs. N52 tunes are.
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The tunes are the same, it's possible something like the N51 could take to timing better because of the lower compression/different head, but we can't be sure. Keep in mind he has an automatic AND he uses 91 Octane.
Based on what I've seen, those number could be in line...