I just got a new wastegate for my 12a turbo setup.
Normally on the manifolds ive seen the wastegate flange is right on the manifold and isnt much longer than about 2 inches. Is it possible to move the wastegate farther away from the manifold using tubning to extend the flange or will this make the wastegate useless. I got a really nice looking tial wastegate and i want to bring it up above the downpipe so you can see it. Is this possible or will it make it unefficent. Im talking about maybe a total of 10-12 inches or steel tubing. Im just not sure if the waste gate has to have somekind of direct flow or it doesnt really matter becasue of the backpressure with the turbine or the turbo?

Thanks,
Old Tex

 

There are many tubular exhaust manifolds that locate the wastegate a sizeable distance from the exhaust ports. Much more important than the distance is the design and diameter of the wastegate tubing. The wastegate tubing should "Y" off of the runners to the turbo, such that the exhaust gasses don't need to make an abrupt turn to get to the wastegate. If you don't follow this design guideline, you'll be susceptible to boost creep or need a larger wastegate than otherwise. Also, you'll want the diameter of the tubing to be equal to or greater than the inlet to the wastegate.

 

Ok.
Thanks for the info.
One other question i have is the flange is only running off one of the 2 runners. Does this matter? Should there be to flanges(one for each rotor housing runner) and meet in a "Y"?
Also the way the manifold came stock the flange is welded about 90 degrees to the runner but is only about 2 inches long.

 

Can you show us a picture or a sketch? What I think I hear doesn't sound so good.

 

Both runners need to be wyed and run to the wastegate. You can't relieve overboost from one and not the other. The one housing that doesn't get relieved will either have to feed back though the relieved one in the overlap cycle, or more likely you will have one rotor that that stands a good chance of detonating.

 

Yeah i had that problem before but i dont think it was all becasue of the waste gate. Ok then me and my freind will get together and weld up a new flange design.
Thanks for the info.