Quote:
Originally Posted by BarryJI
Yes, this recommendation smacks of opportunism on the part of a less than totally honourable tuner/mechanic/service advisor. I've pushed my tuned 228 hard, but always respectfully, on some long road trips and "heat soak" could not have been more of a non-issue. Dinan's S3 for the N20 involves an intercooler paired with a big turbo and, of course, a custom-made tune but that, as you (and Dinan themselves, to their credit) point out, only really makes sense as a race tune. If Dinan offered a S2 tune (which I think usually involves an aftermarket CAI) for the N26 I'd install that in my DD but there's no hope for any such thing being developed for this SULEV power unit.
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The FMIC provided with N20/N26 engines is larger and more efficient than the stock FMIC I had in my 2007 N54-engined E92 3-series. I had to install a larger one to get the Dinan S3 tune flashed, along with a bigger oil cooler which was about the size of the stock cooler in my 228. Seeing as how those components supported a 400+ hp twin-turbo N54, I can't even imagine why a bigger FMIC would do anything for an N26 with just a mild bump in boost on a stock turbo.