Quote:
Originally posted by morepower2
They are laggy, make no power and blow up when you try to turn up the boost, the suck ass no matter what you read in magazines and books.
|
VNT's kick ass when done right! They have better low-end response and less high-end backpressure than even the best ball bearing wastegated turbos. Garrett produces over 3000 VNT's per DAY (yes, per DAY) in Europe, and reliability isn't a major problem. On passenger car diesels.
Unfortunately, nobody has really ever been able to make one work on a gasoline engine. EGT's are too high, or so the thinking goes.
The Aerocharger VNT's seem to have bearing problems more than anything else. The non-pressurized wick-fed bearing system doesn't have the stability to cut it.
VNT's are the wave of the future. They have literally transformed European passenger car diesel engines from foul smoking turb mobiles into clean-running fun-to-drive rocket ships. It is only a matter of time before they get applied to gasoline engines.
However, that will require some serious OEM-level R&D budgets. Not the kind of thing you want to take on by yourself.