Quote:
Originally Posted by rjahl
Do you really believe that intake air pulled from beside a very hot radiator, run through a non insulated duct and into a plastic filter compartment will not pick up any heat from those surfaces? The question is not "if?", it's "how much?". As the recorded IATs dropped pretty quickly with increased combustion air volume, I really feel that IAT's at 10-20 degrees above ambient in those stop and go conditions is very reasonable. Apparently so did BMW, as they designed a very complicated engine management system that uses this data.
You need to fully research the DME before you can appreciate how much effort went into the "Engine performance Model". There are factors/tables for nearly everything and then correction factors for nearly all of them. There is no way BMW did not resolve or account for any inaccuracies in the primary sensors.
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Often, I sum up these up by figuring: if this were so easy and had consistent, proven gains, BMW would've already done it.