You go with an SC to get engine response on a big turboed engine when exhaust gas velocity is low. Obviously you are doing this to overcome lag from trying to spool up a large mass of turbine and comp wheel.
To achieve this you need a postive displacement turbo, most commonly a roots style. These provide boost largely independant of revs and hence can give good bottom end gains.
A centrifugal turbo has worse boost response than most turbos. Their boost curve is, at best, linear with revs so they still have a response hole at low revs. It makes no sense at all to use one of these in conjunction with a turbo setup. They generally have less efficiency than most turbo setups as well so there aren't going to be any top end gains either.
Mon, 24 May 2004 03:24
