I was checking out germancarfans.com blog today and found this interesting post about new turbo technology (http://www.germancarfans.com/news.cf...id/2051115.002).

Porsche and Borg-Warner have teamed up to develop the world's first turbocharged gasoline engine with variable turbine geometry. The principle of variable turbine geometry combines the benefits of a small and large exhaust gas turbocharger all in one – a combination ensuring both very good response and high torque at low engine speeds as well as superior output and high performance at high speeds.

Hopoefully, this technology will transfer to the aftermarket turbo market soon. I'll definitely pick one of these up. Less turbo lag with more power. You can't beat that.

 

This isn't the first time that manufacturers have come up with a design to overcome the limitation of turbo sizing. In the late '80s, Garrett came out with their VNT (Variable Nozzle Turbo), which saw limited production use on the Shelby CSX (based on the Dodge Shadow). The turbo was sized relatively small by today's performance standards, being similar to the Garrett T25 of that time.

A Variable Turbine Geometry turbo with the latest advanced materials and machining would be a welcome addition to any turbo car. Pick a turbo based on projected top-end power and see if the VTG technology offers enough low and mid-range torque for your application. It remains to be seen whether engine management is mandatory to extract the optimum setup for this turbo.

--
0==WW==0
"…axles of evil…" - george w. bush

 

Saw something like this on Trucks on Spike. Only it was for diesel trucks, I think Banks had developed it. Looked and sounded like it had great potential.

 

I guess this tech has been around for some time in diesel engines but it hasn't been done in a production car as of yet. Porsche and Borg-Warner had to overcome higher exhaust gas temps by developing new highly heat-resistant materials to get this bit of technology to work in a gasoline engine. I agree, it has great potential. I think the stock WRX turbo has too much lag and not enough power. But as you increase turbo size you increase lag (unless you resort to some sort of anti-lag solution). I was thinking of using a twin turbo set up to overcome this. I've heard a company called Forced Air Technologies that offers this. Has anyone done this to there car?