Boost addicts 90 na, 2002 vvti engine, t04e twin scroll turbo, fully custom build - Page 4 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 08-03-2016, 09:01 AM   #61
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It appears you paired 1&3 and 2&4, that correct?



I'm going to let that soak in...
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Old 08-03-2016, 09:37 AM   #62
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I was excited about this and was just going to watch, then it started going downhill.

Then I realized you're only going to use one wastegate, was really hoping for a proper twin scroll system but whatever.

Then on your last post I see you built the manifold completely wrong and you paired the incorrect cylinders, and that's where I stopped reading...
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Old 08-03-2016, 09:42 AM   #63
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[ scrollscroll | scrollscroll ]
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Old 08-03-2016, 09:47 AM   #64
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obvious answer is obvious. Custom crank and cams.
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Old 08-03-2016, 09:56 AM   #65
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oh boy
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Old 08-03-2016, 09:56 AM   #66
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I was so excited....now I'm sad
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Old 08-03-2016, 09:59 AM   #67
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should have read more miataturbo.net before you boosted.
This NOW applies!

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Old 08-03-2016, 10:02 AM   #68
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Now I kind of want to see him finish this. I wonder how it will perform. Dont think it's been done this way before. Bets on if it's worse or equal to single scroll?
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Old 08-03-2016, 10:04 AM   #69
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The only way to know would be to build the same exact manifold with a 4-1 merge and the same turbine A/R but in a single scroll on the same turbo, which won't happen. This turbo will spin, it will make boost: he will win because X.
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Old 08-03-2016, 10:08 AM   #70
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Quote:
Originally Posted by TurboTim View Post
The only way to know would be to build the same exact manifold with a 4-1 merge and the same turbine A/R but in a single scroll on the same turbo, which won't happen. This turbo will spin, it will make boost: he will win because X.
Couldnt you take this manifold. And grind out the divider?
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Old 08-03-2016, 10:09 AM   #71
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Yeah, duh. Or just a single scroll turbine housing with the same flange.
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Old 08-03-2016, 10:11 AM   #72
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even more duh.
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Old 08-03-2016, 10:18 AM   #73
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I know nothing about twin scroll. Once again MT.net learns me. My education is ongoing.
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Old 08-03-2016, 10:23 AM   #74
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I know nothing about twin scroll. Once again MT.net learns me. My education is ongoing.
The point of it is to separate exhaust pulses. So they don't run into each other/into other open exhaust valves. So you want 1&4 paired and 2&3 paired. Firing order is 1-3-4-2. So it fires into opposite scrolls each ignition event.
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Old 08-03-2016, 10:32 AM   #75
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Quote:
Originally Posted by aidandj View Post
The point of it is to separate exhaust pulses. So they don't run into each other/into other open exhaust valves. So you want 1&4 paired and 2&3 paired. Firing order is 1-3-4-2. So it fires into opposite scrolls each ignition event.
Makes total sense. I guess if I thought about it for ten three minutes, I would have drawn a similar conclusion. Isn't this like, exactly the same as a 4-2-1 header? Keeping gas pulses moving foreward and pulling the next one behind.
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Old 08-03-2016, 10:55 AM   #76
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1-4 and 2-3 should be tied together.

Will this need a brace? I don't remember but you said you where doing a stepped runner, is that just where the two converge to one per port on the flange?

Edit: had the respond window open too long. My post is now irrelevant
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Old 08-03-2016, 11:02 AM   #77
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I know nothing about manifold design... but I do remember something about 4-2-1 headers. Is there any substantial performance disadvantage to merging the 1&4, 2&3 BEFORE the turbo flange? Is the flow path too short at this point to make merging practical? I would imagine that it might make packaging easier. Am I mistaken?
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Old 08-03-2016, 11:07 AM   #78
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Quote:
Originally Posted by Chiburbian View Post
I know nothing about manifold design... but I do remember something about 4-2-1 headers. Is there any substantial performance disadvantage to merging the 1&4, 2&3 BEFORE the turbo flange? Is the flow path too short at this point to make merging practical? I would imagine that it might make packaging easier. Am I mistaken?

Yes you're mistaken. You have it backwards, there is a performance advantage when pairing 1/4 and 2/3 before the turbine housing, not a disadvantage. And yes it matters, it's the entire basis of how twin scroll works.
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Old 08-03-2016, 11:09 AM   #79
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Quote:
Originally Posted by Arca_ex View Post
Yes you're mistaken. You have it backwards, there is a performance advantage when pairing 1/4 and 2/3 before the turbine housing, not a disadvantage. And yes it matters, it's the entire basis of how twin scroll works.
I think he is asking why not have the runners connect at the flange instead of inches before.
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Old 08-03-2016, 11:13 AM   #80
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Quote:
Originally Posted by psyber_0ptix View Post
I think he is asking why not have the runners connect at the flange instead of inches before.
If that's the question then I don't think that would have a noticeable effect with only a couple inches difference.
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