07-03-2015, 06:37 PM
Good on you for putting all that together and doing some proper research, you had it on a proper engine dyno aswell? Brilliant imo
Was this part of a course, dissertation or similar?
As a lashup, a vnt on a boost can is a quick way of getting them to work to a certain degree. plenty fine for a cheap peugeot and overal way betetr than a wg equivalent
but just as your dyno graphs shows, if you wind them up for spool, they choke up initially until the vanes open and then flow better as they get on - hence the dip.
electronic vnt control is pretty complex and really does need a ton of live mapping to fine tune it all - needs a mix of open and closed loop control to get it nailed perfectly - and that would be just for one combination of engine + turbo + fuel + power
Was this part of a course, dissertation or similar?
As a lashup, a vnt on a boost can is a quick way of getting them to work to a certain degree. plenty fine for a cheap peugeot and overal way betetr than a wg equivalent
but just as your dyno graphs shows, if you wind them up for spool, they choke up initially until the vanes open and then flow better as they get on - hence the dip.
electronic vnt control is pretty complex and really does need a ton of live mapping to fine tune it all - needs a mix of open and closed loop control to get it nailed perfectly - and that would be just for one combination of engine + turbo + fuel + power
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