Carrizog, at present the vanes in my VNT are easy to move. Okay now I understand. Yes my wastegate/boost can is from a T3 where yours is from a T2. When boosting on the gas hard(I have a open style muffler) the exhaust does get louder, but by no means loud. I have 2.5 inch exhaust from the turbo back.I have a couple linkages that operate the VNT control and you could make it more or less movement depending on what you want. With my linkage I wanted it to be about the same movement that the control needs so maybe 5/8" or 3/4" (13 to 20mm) or about how much the linkage on the turbo moves. I tried to keep it 1:1. I have lots of movement on the boost can and the cable also has adjustment for length. Attached to the pump I have a plate bolted onto the throttle part that has a slot in it, so I can move the arc that pulls the cable either longer or shorter.I'd say economy suffers in my case too as once you have a vnt its hard to stay off the boost. it's awesome...pull.
I was just trying to change my vacuum can to a boost can that came with the VNT.(my t2 can doesn't move enough, have enough travel) I have a control linked to the throttle and am having much trouble sealing my vacuum can to add to this linkage.I got thinking - why do I need a boost can in line with the throttle linkage. I know I've seen this setup on here. If you have a direct linkage without a boost can, simply set the linkage to what you want for boost at full throttle. The boost can will only back off the boost once you hit a certain point and will be very linear at doing that. It won't back off boost pressure just at max boost, it will back off boost pressure very linear to what you adding with your foot/accelerator pedal. With a direct linkage, which is almost what I have now, boost will be linear to throttle position. (t2 can only moves like .02")I live on the prairies, flat area; I see no need for a boost can. I'm going to try a direct linkage and see how it works. Just thought I'd add this...
here is a free fully programmable open source VNT, or VNT+LDA controller. the source code is free, and the microcontroller is ~$35.source code:http://dmn.kuulalaakeri.org/vnt-lda/open source microcontroller:http://arduino.cc/en/Main/ArduinoBoardUno
I got thinking - why do I need a boost can in line with the throttle linkage. I know I've seen this setup on here. If you have a direct linkage without a boost can, simply set the linkage to what you want for boost at full throttle. The boost can will only back off the boost once you hit a certain point and will be very linear at doing that.