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.

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 :)

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!

Equal length + long runner + A/C = essentially impossible.

I know. Really iffy on giving that up though.

A/C P/S? Bla. With enough time...

TS silly!
http://www.inoneear.com/outtheother/...0collector.jpg
Time for bed.

No, no need for P/S.

AC and PS and long tubes!?

http://gallery.y8s.com/d/22198-2/waterlines03.jpg

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

(dont think they are equal length tho)

Yeah.... that's... not what I'm looking for. x.x

Who made that manifold? And is it y8s like Yeats or y8s like yates or y8s like yatts (e.g., Matt).

Attachment 191255

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.

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.

you could just make an absurdflow absurd mount and put the collector above the left front wheel

Hmm...ok, makes sense. How about this one then? ;)
http://www.absurdflow.com/miata/stan...absurdflow.jpg

true. Or in front of the engine sideways like some drag cars do. Anything's possible.

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

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

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.

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

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.