Variable Turbine Geometry

[Botters]

So do u reckon we could organise a group buy for some of these VTG's???

[Jolinator]

I beleive VW have been using variable vane turbos for years

Vw and Audi engines Use VTG turbos for there diesils , the petrol engines run a combination of k03/k04 KKK turbos.

Edited July 29, 2006 by Jolinator

[Warpspeed]

I doubt if Nissan Australia will sell you spare parts cheaper with a bulk buy, but you can always try. Just go into your nearest Nissan spare parts and order a 14411-VC100 replacement turbo for a Nissan Patrol 4WD. This one took two days to come from interstate, but any Nissan dealer can get one in pretty quickly.

Some of the more recent small Mercedes diesel delivery vans sold in Australia now use VNT turbos too. I don't know how big these turbos are. The Nissan Patrol VNT is probably still the largest VNT readily available in oZ, except perhaps for Porsche. I don't know how much a new Porsche VNT turbo would cost, probably $6,000+ maybe ? And as Porsche use two of them, they may not be all that big either.

But you will also need to figure out a way to control the vanes. The Nissan control actuator looks exactly like a wastegate actuator, but it works entirely backwards. The vanes are held fully open by a spring in the actuator can. Increasing vacuum to the actuator closes the vanes. There is an adjustment screw to set (mechanically) how far the vanes can close at maximum control vacuum. When closed completely the vanes seal right up against each other, and all exhaust flow from the engine is completely blocked. But you can readily set the minimum vane opening position to best suit the engine. It looks a bit like the stop screw on an ordinary throttle body, and works in a similar way on the vane control arm.

You will want the vanes fully open all the time except when you want to see some boost pressure during acceleration. The vanes must then very quickly close. The vanes must then gradually open far enough to hold boost at whatever pressure it should be.

However you decide to do that, you are going to have to design and build your own vane controller actuator, and figure out a whole control strategy.