pgarner
TC ModFather
Ok this was touched upon in Skoda VRS have you driven one.
most diesels have variable vanes to adjust boost.
ok what im really looking is more info on these. how do the vanes change their angle to increase pressure the bearing spins at high speed so i cant see how it easily they could be turned.
And why arent they used on petrol models ?
as was also touched by HDI in the above thread was that his Pug 406 has variable vaned Garrett turbo but it has a waste gate fitted to it as well. can anybody answer why this is as surly not required as the vanes could lie basically flat to get no boost and therefore no need for the wastegate.
the best answer i could come up with was as a safety device in case the vanes were to get jammed in a high boost setting. But surely if the engineers had spend millions on the engines they way have worked out how to get rid of this problem
Questions lots of questions so all you diesel heads see if you can answer any of these questions please
most diesels have variable vanes to adjust boost.
ok what im really looking is more info on these. how do the vanes change their angle to increase pressure the bearing spins at high speed so i cant see how it easily they could be turned.
And why arent they used on petrol models ?
as was also touched by HDI in the above thread was that his Pug 406 has variable vaned Garrett turbo but it has a waste gate fitted to it as well. can anybody answer why this is as surly not required as the vanes could lie basically flat to get no boost and therefore no need for the wastegate.
the best answer i could come up with was as a safety device in case the vanes were to get jammed in a high boost setting. But surely if the engineers had spend millions on the engines they way have worked out how to get rid of this problem
Questions lots of questions so all you diesel heads see if you can answer any of these questions please