EVOEMS

Is there anyone doing Variable turbine geometry for the EVo? Porsche has been using this with great success, boosts low rpm torque without sacrificing top end power, for two or three years. Kind of like the MIVEC, but on a turbo application. The small displecement Evo seems like a perfect fit for this technology. CBRD,...FP...anyone????

vwjeff

iTrader: (13)

VW runs the same on all our turbo cars, and we have direct injection

JohnDoe1984

iTrader: (1)

It's cheap to make for a diesel because they have lower exhaust temps so they can be made with commonly available materials. The complicated parts in a VTG on a gas engine have to be made of expensive high heat resistant stuff. I suppose that's the main reason you don't see more of them.

My buddy has an old Shelby CSX made from a dodge shadow by shelby. It has one. I think it's one of the first gasoline cars to use it.

94AWDcoupe

iTrader: (125)

Its awesome technology but not with out some drawbacks. First as stated already the variable vane parts dont handle high EGT. the EGT has to be kept to 850C or lower. This is a steep task with regular fuel. But with e85 this is quite easy to do. Second is the turbo has to be sized correctly for it to work right. There are no size choices to speak of. So if there isnt a turbo already on the market that fits the application you want to use it on then you are out of luck. Last the vane needs to be controlled with a V-tech type map. So a capable standalone would be needed. In the end looking at a dynograph of the VVT porsche is a wet dream. Makes 450TQ from 1800rpm to 5800rpm. 4000RPM of power band starting from 1800RPM is amazing

Tallen

iTrader: (2)

Very good info above. They have many technical drawbacks and reliability can be an issue (cost too).

I think the next step will be that electronic assisted turbo.