indeed it is the bootstrap
Websearch on "bootstrap", "wastegate" "automatic wastegate" "differential pressure controller". eg
http://www.ec.erau.edu/cce/centers/e...esentation.htm
The phenomenon is that the engine cannot maintain the desired manifold pressure and is principally caused by the engine rpm being too low and the altitude too high.
Last edited by enicalyth; 26th November 2004 at 10:25.