Quote:
Originally Posted by f11tw
I tend to subscribe to the view that there are other mechanisms controlled by DME software that limit the output of the 20i engines, so that physical differentiation or binning is not necessary.
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The purpose of binning is not to limit the power of the engine but to choose which one becomes a 20i & which one remains a 28i (low compression version only). When it becomes a U0 it'll have U0 specific software.
The max boost of the U0 is naturally lower than the O0 as a.) it is to limit the power output & b.) prevent detonation on the high compression version U0. The only physical differentiation between high compression version U0 & O0 is the pistons. As before, they can increase efficiency of the engine by increasing compression as the max boost is lowered to a level where detonation will not occur. So the main aim of making a high compression version of the U0 N20 is to increase efficiency, limiting tuning potential is a useful by-product.