turbo a st170???
05-06-2009, 08:43 PM
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Audi 20V turbos have VVT if I remember right. Also Skylines and Supras.
Mapping from scratch is a drawn out procedure as advancing/retarding cam timing changes the amount of air inducted and hence the VE @ that load/boost/speed site. But changing the advance/injection to take advantage of the changed VE, will affect the resultant boost.... So to do it properly is a time consuming exercise. I should imagine that the OEMs do it by CFD modelling to get a start point and fine tune on the engine dyno.
Chris
Mapping from scratch is a drawn out procedure as advancing/retarding cam timing changes the amount of air inducted and hence the VE @ that load/boost/speed site. But changing the advance/injection to take advantage of the changed VE, will affect the resultant boost.... So to do it properly is a time consuming exercise. I should imagine that the OEMs do it by CFD modelling to get a start point and fine tune on the engine dyno.
Chris
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