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Discussion Starter #1
I will get a picture a little later, but I just wanted to know if anybody has done this.

I have a 1/2" plate with a slightly larger hole than the turbine, then a 3" downpipe. Then a 1" diamter hole(may need to go 1 1/2") with a 1 1/2" pipe coming off for the wastegate. The turbine chamber and the wastgate chamber have been seprated by a divider I built into the flange. For now, I just have it vent just below the engine, but I will probably run it to the back of the truck and maybe put a muffler on it.

For some reason, either my chamber divider leaks, or the wastgate flap does not seal 100%, because quite a bit of exhuast comes out of the smaller pipe under normal driving conditions. Still pretty quiet, just sounds like a small exhaust leak.

Very cool sound when you hit full boost though. Fairly quite vehicle, but at WOT when full boost is achieved, it sounds like you just dropped the exhuast.

Power increase....Not sure yet, but it is faster. I have too many variables right now. I drove it just before this design with just a 3" downpipe completly open, then I build a full 3" exhaust with cat and a very restrictive muffler. But yet another variable is I don't know what the boost is. I Need to get a boost guage to make sure the boost did not increase.
 

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I've thought about this design, but have never implemented it. Plumb your wastegate pipe back into the down pipe, and your suspected exhaust leak won't be that much of a concern any longer. Send pics when you can.
-Aaron
 

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Discussion Starter #3
I would want to plumb it after the cat if althought that would be considered illegal.

But really, I like having the exhuast open up when I reach full boost. I would like it to be a little quiter, duel exhuast anyone?
 

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cool, man! any signs of boost creep?

also, i wonder if it'd be worth it to try to make the wastegate actuator dual port. if that ended up keeping the wastegate more (fully, perhaps) closed once boost started, it might be able to improve low end torque and spool. i dont exactly know how one would control boost without a fancy elecronic boost controller; you'd have to have a set up that applied pressure to the main port of the actuator but also stopped pressure to the secondary port at x amount of boost

shiva
 

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oh, nevermind, i think it'd be pretty cheap to do w/o an electronic boost controller.

for the port that's already on the wastegate you could just hook up one of them ball and spring valve boost controllers. for hte second port, you could have a check valve, and between the check valve and the port, a ball and spring valve off a tee, venting to atmosphere, so the actuator would hold pressure and increase force against the diaphragm, and then once it hit your desired amount of boost, that pressure would release, and the first port would have pressure come in and slam the wastegate open.

did you find that the wastegate open like, a lot, before full boost?? if so, i think this might be worth trying out

shiva


shiva said:
cool, man! any signs of boost creep?

also, i wonder if it'd be worth it to try to make the wastegate actuator dual port. if that ended up keeping the wastegate more (fully, perhaps) closed once boost started, it might be able to improve low end torque and spool. i dont exactly know how one would control boost without a fancy elecronic boost controller; you'd have to have a set up that applied pressure to the main port of the actuator but also stopped pressure to the secondary port at x amount of boost

shiva
 

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no offense, but whats the point of venting the stock wastegate to atmosphere other then to make noise under ful boost? id rather hear the turbo whine myself. to each their own i guess.
william
 
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