New Turbo elbow design (external vent wastegate)

1746 Views 6 Replies 5 Participants Last post by williamb82, Sep 25, 2003

SuperRunner

Discussion Starter · Sep 22, 2003

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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shiva

· #5 · Sep 23, 2003

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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shiva

· #6 · Sep 25, 2003

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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