Next Generation Of Turbo?

[unreal808]

I was looking at my old textbooks and found this a Variable nozzle turbo.

[LightningGSX]

I think thats a rather old concept(20+ years). I believe they are used on some diesels, I always wondered why they're not more common on passenger vehices.Seems to be a superior design, wouldn't even need a wastegate.

[IndiEP]

You can find those on some of the old mopar turbo cars.

[LightningGSX]

The Daytona's right?

[95tsi]

'89 Shelby CSX-VNT The Dodge Shadow body with the 2.2L Turbo motor. Personally I think it is a sweet car. Had the option for Recaro seats and wide tires. Cool car. Other cars with the VNT I have no idea, just that one I know of.

[SuperSleeper]

Yeah, that technology's been around for 2 decades. The VNT's off the turbo dodge's are actually pretty pricey... people are attracted to that design, though you don't usually see as high PSI produced with them VS the standard Garrett's used on the rest of the Turbo Dodge vehicles.

[LightningGSX]

Other than the potential reliabilty issues I could see, there must be some caveat to them.From what I read on a few websites, Garrett was selling them at surplus prices in the late 80's.

[Shane@DBPerformance]

One problem with having any large turbo spool too fast on a small displacement car is surge. I am not talking about fake internet(bov) surge either. You could probably try to use VNT to spool a T88 early on a 2.0 DSM, but the turbo might destroy itself when it starts surging because the 2.0 can't take in anywhere near enough airflow at 4000 or whatever RPM. So you really can't have your cake and eat it too. Also a small exhaust side does make a turbo spool fast, but a small exhaust side doesn't make power. You probably end up with a high backpressure to boost ratio that doesn't end up making good power until your up into the area where the turbo should have naturally spooled anyways.