Quote:
Originally Posted by cstavaru
I was supposing that you intend to use the same car, and only switch the intercoolers for testing, right ? Because otherwise the comparison wouldn't really make sense. In this case, the wastegate duty cycle differences can only be attributed to the intercooler.
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This is partially correct, on many of the n54/n55 engine management systems there is AIT based boost/load which means that if the AiTS are low the tune will request more boost/load(and increase WGDC) this along with the fact that lower ait will also lower boost levels(via pressure drop which we are trying to differentiate in the calculator) can give a muddled view of reality. The BEST way to measure actual pressure drop is to measure pressure drop
and then separate that into pressure drop caused by AIT reduction and pressure drop caused by frictional losses.
On the n54/n55 engine management system there is more power to be made via low AIT which has submaps that alter the tune/power, then boost level(lower wgdc) which is an arbitrary measure of restriction in the entire system which have no submaps to alter the tune, Shiv and Terry and any other tuner will attest to this, and have commented on this in other threads. This is the reason that fmics that have better temperature reduction have higher dyno deltas than those that are not very good at controlling temperature rise, anyone that loses power on a hot vs cold day can easily understand this
