VNT Turbo's

[Benjamin]

understanding turbomaps can also be found here
http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html

i was also thinking those maps should +- the same, but only nobody could say this is a fact.

Greetz, Benjamin

[subsonic]

So with the vnt style of turbo, how do you size one for your application?  If the internals are variable and change to meet load conditions, this changes everything, does'nt it?

[jimfoo]

No, the variable part is on the exhaust, so it just changes how the turbo spools. The map is for the compressor which will pump x amount of air at y psi pressure when turning z rpm. You would size it like any other turbo. But that is also where vane control comes in, to make sure you stay within the safe area as I believe a VNT is easier to put in the surge zone since it spools faster.