Has anyone messed about with using VEMS output to control a variable geometry turbo such as the Holset 351VGT? These vary the turbine housing volume from 3mm
2 to 25mm
2.
I am looking at using this set up to achieve fast spool using TPS and RPM to activate it on an BMW s38b36 engine. My idea is that for:
TPS<50% all RPM range to set the housing to 25mm
2 which I have calculated to to spool 1 bar from ~4500rpm.
TPS >50, RPM 1000 to 2500 to set the housing to say 10mm
2 for spool at 1800 RPM,
TPS > 50%, RPM 2501 to 4500 housing 18mm
2TPS > 50%, RPM 4501 to Redline (Set to 7000) housing at 25mm
2The concept is to control spool. The built in boost control will monitor boost.
People have been messing about with controlling this turbo. See here
http://www.homemadeturbo.com/f7/holset-vgt-he351ve-controller-117261/It is a long read but with good info.