What is this blue hose for?

 

Waste gate

 

Pinch that line off with a set of pliers and drive it for a little while. I bet it has more power then.

 

So it is a waste gate

 

yea its the line that opens it, when u hit a certain psi it pops the diaphragm and holds the wastegate open

 

Looks like that nut on the outside of the brass fitting is the adjustment for it. If so, you can adjust when your wastegate opens with it.

 

yea, like they said it is the vacuum source to operate the wastegate. also, i don't know what type of construction the hose is made out of but things get nice and toasty right on top of the turbo like like. you might want to route it on the under side of the engine.

 

I don't think its vacuum actuated, isn't it boost?

 

I dont know what it is but it was on there when i bought the truck about 18k miles ago. Do your alls trucks have this, i thought that the first genns were not wastegated.

 

Boost actuated.

 

No sir, that is not a standard item; someone has put that on.


That must be some good hose to not already be melted; my turbo melted the A/C evaporator-box on my truck, forcing me to build a replacement out of metal.

 

I was going to say it looks like a boost controller, the type used on the little gassers with the BIG turbos
http://www.boostcontroller.com/index.php?category=97
this is what i think it is

 

yea boost actuated, sorry i was still thinking in terms of my old turbo gasser.

 

Based on the pic it looks like your truck may have a Banks turbo.

 

i think mine has a banks kit installed by a earlier owner and it has that same blue hose on it. and it is routed over the top and hasn't melted. yet.