Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power? - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 01-31-2011, 10:25 PM   #41
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Originally Posted by Faeflora View Post
Ahh Tim, so is that the twinscroll mani you said you would CAD out for me?

Are all the runners actually equal length? Looks like some are not
Yeah I did it "quick" after work tonight, before dinner. At the moment no they aren't all equal but each pair is (relatively). I plan to tweak it som-mo, try bringing #3 (the shortest) over #1, #2 is easy to lengthen.

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Oh and for non twinscroll, #3 is pretty sick and my favorite other than twinscroll but it looks like it comes off the head a decent distance. looks like the turbo would hit the subframe?
All of these shown place the turbo in the same spot as my current centered/low mount manifold, including the twinscroll (but the twinscroll has the T4 flange). Anyway, back to the discussion
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Old 01-31-2011, 11:44 PM   #42
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What runner length are you aiming for with the designs?

What I'd be looking for is equal length above all else, and the longest runners that can package.

Edit: And... looking for AC compatability. No PS though. Hard mode!
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Old 01-31-2011, 11:55 PM   #43
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Equal length + long runner + A/C = essentially impossible.
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Old 01-31-2011, 11:55 PM   #44
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Equal length + long runner + A/C = essentially impossible.
I know. Really iffy on giving that up though.
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Old 02-01-2011, 12:35 AM   #45
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A/C P/S? Bla. With enough time...

TS silly!

Time for bed.
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Old 02-01-2011, 12:38 AM   #46
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No, no need for P/S.
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Old 02-01-2011, 12:40 AM   #47
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AC and PS and long tubes!?



**** son, I been doin that so long it's been discontinued.

(dont think they are equal length tho)
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Old 02-01-2011, 12:41 AM   #48
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Yeah.... that's... not what I'm looking for. x.x
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Old 02-01-2011, 01:26 AM   #49
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AC and PS and long tubes!?


**** son, I been doin that so long it's been discontinued.

(dont think they are equal length tho)
Who made that manifold? And is it y8s like Yeats or y8s like yates or y8s like yatts (e.g., Matt).
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Old 02-01-2011, 01:30 AM   #50
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Name:  IMG_20101014_091519.jpg
Views: 18
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If the last tubes had a nice U in them and the turbo was sitting lower and futher back, I could see a longer tube header working fine with AC. Certainly not in the low mount spot of the Absurdflow setup, but doable.

It's a greddy, and obviously not perfect, but just as an idea. Moved a bit further down and further forward, actually... lots forward without PS would be possible.
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Old 02-01-2011, 12:37 PM   #51
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Fluid dynamics favors a design with the fewest bends from a drag and loss of impulse energy standpoint. You want very few 90s and no 180s if you want to maximize the effect of energy pulses on the turbine and not slamming into a corner and being dissipated as heat or rebounding. I don't have access to the fluid dynamics programs that some of you were using for intake manifold design, but many of the same principles are applicable. I recall that each 90 creates as much drag as 20 feet of straight pipe of the same diameter. If you must bend, use wide sweeping arcs.
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Old 02-01-2011, 12:56 PM   #52
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you could just make an absurdflow absurd mount and put the collector above the left front wheel
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Old 02-01-2011, 01:22 PM   #53
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Quote:
Originally Posted by sixshooter View Post
Fluid dynamics favors a design with the fewest bends from a drag and loss of impulse energy standpoint. You want very few 90s and no 180s if you want to maximize the effect of energy pulses on the turbine and not slamming into a corner and being dissipated as heat or rebounding. I don't have access to the fluid dynamics programs that some of you were using for intake manifold design, but many of the same principles are applicable. I recall that each 90 creates as much drag as 20 feet of straight pipe of the same diameter. If you must bend, use wide sweeping arcs.
Hmm...ok, makes sense. How about this one then?


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you could just make an absurdflow absurd mount and put the collector above the left front wheel
true. Or in front of the engine sideways like some drag cars do. Anything's possible.
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Old 02-01-2011, 02:33 PM   #54
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Here is whats on my car.
1-1/4” schedule 40 pipe from head flange to turbo flange the equal lenght runners are 16.6” long
Note the Dyno-plot. Heavy on low and mid rage torque spools a GT3071R quickly not a top end only shape at all.

Definately not AC/PS compatable.

Bob
Attached Thumbnails
Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power?-manifold2.jpg   Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power?-manifold3.jpg   Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power?-manifold4.jpg   Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power?-manifold5.jpg   Turbo manifold styles- Absurdflow lowmount vs ramhorn, which for maximum power?-powersmall.jpg  


Last edited by bbundy; 02-01-2011 at 02:48 PM.
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Old 02-01-2011, 02:52 PM   #55
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Very nice! It is weird that when I look at your .jpg's I instinctively try to rotate them to get a different view? haha. What software was that modeled in?
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Old 02-01-2011, 02:53 PM   #56
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Originally Posted by TurboTim View Post
Very nice! It is weird that when I look at your .jpg's I instinctively try to rotate them to get a different view? haha. What software was that modeled in?
ProE

Things to note the turbo is shifted forward and is mounted very low. If it was centered between the 4 runners the outlet of the compressor would be pointing right at the steering shaft U-joint and wouldnt fit well.

Bob
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Old 02-01-2011, 03:23 PM   #57
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What size A/R on the 3017 bbundy and who made the manifold?

Also Tim could you possibly replicate that thing. That low end torque is godly. Beat my t2554 by a metric shitton.

Last edited by shuiend; 02-01-2011 at 04:07 PM.
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Old 02-01-2011, 03:40 PM   #58
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Quote:
Originally Posted by shuiend View Post
What size A/R on the 3017 bbundy and who made the manifold?

Also Tim could you possibly replicate that thing. That low in torque is godly. Beat my t2554 by a metric shitton.
Turbine
-Wheel: 56.5mm w/ 84 trim
-Housing: 0.64 a/r

Compressor
-Wheel: 71mm w/ 56 trim
-Housing: .50 a/r

Internally wastegated.

I made the manifold myself. It’s lasted almost a year without messing with it now that I switched to Inconel studs. I made it before there were V-bands available.

Bob
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Old 02-01-2011, 04:49 PM   #59
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Quote:
Originally Posted by shuiend View Post
What size A/R on the 3017 bbundy and who made the manifold?

Also Tim could you possibly replicate that thing. That low end torque is godly. Beat my t2554 by a metric shitton.
Note that his engine is a stroker. Kinda like comparing apples to apples dipped in cocaine.
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Old 02-01-2011, 04:51 PM   #60
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Quote:
Originally Posted by Faeflora View Post
Note that his engine is a stroker. Kinda like comparing apples to apples dipped in cocaine.
He is running on a bone stock 1.8 right now iirc and has been for about a year.
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