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Old 08-16-2018, 10:32 AM   #26
Tfrasca
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Originally Posted by 55superbeetle View Post
Use schedule pipe for sure, and even then hanging a gate off a long stretch of pipe is asking for failure. Pretty sure those small gate flanges accept 1 1/2 schedule pipe nicely. I've done a few turbine mounted gates and they all worked okay. I have done one similar to your first pic on a turbo v8 with a 50mm gate. Previous combos with normal gate mounting I can normally control boost to sub 5 psi, but that turbine mounted one wouldn't make any less than 12 pounds even with a 3 pound spring in the gate. Ones with the gate right after the flange worked great as expected.
Awesome, thanks. Do you think putting a bracket right next to the wastegate over to the housing bolt would prevent cracking? I made a really crude drawing with no actual measurements to illustrate my point.

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Old 08-16-2018, 12:40 PM   #27
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Should be fine as long as there is a bellows or flex tube right by where the bracket would go.

I really like how you took the time to illustrate the cooling fins on the gate, btw.

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My knob has a big chunk of steel on it
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Old 08-16-2018, 12:52 PM   #28
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Possibly the most apt use of that Napoleon clip, ever. It looked like a lamp without the cooling fins, so I stand by that design decision.

It might be tough to fit a flex section. Maybe I'll have to use 2 45*s with a straight in the middle instead of a big sweeping 90*.

I wish I would have known about the schedule pipe being better for this before I ordered a bunch of 1.75 and 1.5 exhaust tubing.
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Old 08-16-2018, 01:27 PM   #29
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I mean I would not worry about it too much as long as there is wiggle room for it to expand and contract
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Old 08-16-2018, 01:31 PM   #30
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Yes on bracket and +1 on allowing for thermal expansion.

Nice drawing. I made infinity of those at scout camp.
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Old 08-16-2018, 01:33 PM   #31
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You could weld a tab onto your wastegate pipe and use a small heim-jointed link to connect it to the turbine housing. Limit vibration but allow for growth and for... shrinkage.
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Old 08-16-2018, 02:12 PM   #32
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Come on, I'm a visual learner. Plus, EivlEvo up there asked for a picture. I'm just giving the people people what they want.

Good call on a heim joint. I think the current plan is to use a schedule pipe welded to the housing, then a flex section, and the rest could be normal exhaust tubing with a bracket. I feel pretty good about that, so we'll see how it works out in real life.
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Old 08-16-2018, 03:14 PM   #33
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What about the pre-90 manifold? It has a nice flat bottom for mounting an external gate.
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Old 08-16-2018, 04:20 PM   #34
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Come on, I'm a visual learner. Plus, EivlEvo up there asked for a picture. I'm just giving the people people what they want.

Good call on a heim joint. I think the current plan is to use a schedule pipe welded to the housing, then a flex section, and the rest could be normal exhaust tubing with a bracket. I feel pretty good about that, so we'll see how it works out in real life.
You'd probably get enough flex/expansion out of vbands no? But maybe too much leakage?
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Old 08-16-2018, 04:33 PM   #35
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Come on, I'm a visual learner. Plus, EivlEvo up there asked for a picture. I'm just giving the people people what they want.

Good call on a heim joint. I think the current plan is to use a schedule pipe welded to the housing, then a flex section, and the rest could be normal exhaust tubing with a bracket. I feel pretty good about that, so we'll see how it works out in real life.
I was just continuing the Napoleon Dynamite theme with the scout camp reference

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You'd probably get enough flex/expansion out of vbands no? But maybe too much leakage?
No - a proper v-band joint won't allow any flex or relative motion between the two parts being joined. It's a solid connection once the clamp is tightened. Also shouldn't leak at all if you have the correct clamp and have it sufficiently torqued.
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Old 08-16-2018, 05:09 PM   #36
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Nice drawing. I made infinity of those at scout camp.
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Come on, I'm a visual learner. Plus, EivlEvo up there asked for a picture. I'm just giving the people people what they want.


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I was just continuing the Napoleon Dynamite theme with the scout camp reference


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Old 08-16-2018, 05:14 PM   #37
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I would have it exit the housing at the 8 oclock position like in post #10 with a bend upward to put it where you want and not worry about bracing it. It wont be easy to find a bellow that fits the OD of schedule pipe and it will just add another failure point. I assume you're recirculating back into the downpipe? If so definitely but a bellow on the gate outlet tube to keep it from tugging on the gate.
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Old 08-16-2018, 05:30 PM   #38
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Originally Posted by 55superbeetle View Post
I would have it exit the housing at the 8 oclock position like in post #10 with a bend upward to put it where you want and not worry about bracing it. It wont be easy to find a bellow that fits the OD of schedule pipe and it will just add another failure point. I assume you're recirculating back into the downpipe? If so definitely but a bellow on the gate outlet tube to keep it from tugging on the gate.
Even though the 8 o clock position would be in the scroll part of the housing? I'm not sure if I'm referring to that right. Scroll? Volute? If I moved it another inch toward the flange, it'd be before it gets into the scroll part.

And yeah, it'll be going back into the downpipe with a flex section for sure.
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Old 08-16-2018, 06:03 PM   #39
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I have been very much into the sound with a spark arrestor at the end of the tube. It's audible but not tooooo loud.
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