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      07-02-2018, 01:55 PM   #17

Drives: M235i 6MT / E92 328 Msport 6MT
Join Date: Nov 2013
Location: Florida

iTrader: (6)

Originally Posted by atmosphericM View Post
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.
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...