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Old 03-03-2008, 11:26 AM   #1
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Default Did i ever show you guys my...

downpipe after I revised it?



if you want, i can take pics of the rest of the exhaust while it's off the car. well, everything but the turbo flange piece. that's a bitch to remove.
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Old 03-03-2008, 11:32 AM   #2
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nope you never showed me , take the pics
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Old 03-03-2008, 11:59 AM   #3
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4" to 3"?
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Old 03-03-2008, 12:23 PM   #4
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nice, looks "by the book" to me. Bet it's 2.5 to 3...?
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Old 03-03-2008, 12:28 PM   #5
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did i ever show you guys my...
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Originally Posted by Braineack View Post
4" to 3"?

and people wonder why the public questions miata drivers....
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Old 03-03-2008, 12:53 PM   #6
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Originally Posted by Braineack View Post
4" to 3"?
it's actually 2.25 to 3. the 2.25 is the outlet diameter of the turbine housing. It's got a wall to reduce turublence inside the flange.





In an ideal world where I didn't have to put a 90 at the turbo, I would have put the reducer at the flange. next time I guess.
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Old 03-03-2008, 01:05 PM   #7
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Did you consider running your EWG off the dp flange at the internal WG port vs. the #4 runner? Just wonder if there's any disadvantage to doing it that way. I found a lot DSM setups using that port for the EWG.
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Old 03-03-2008, 01:14 PM   #8
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ok looking at it backwards...i knew you had a 3" exhaust so i was worried about the placement of the o2 bungs. i got it now, looks good.
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Old 03-03-2008, 01:21 PM   #9
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Originally Posted by m2cupcar View Post
Did you consider running your EWG off the dp flange at the internal WG port vs. the #4 runner? Just wonder if there's any disadvantage to doing it that way. I found a lot DSM setups using that port for the EWG.
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The new downpipe looks good I like it. Now i want vbands.
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Old 03-03-2008, 01:27 PM   #10
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wait, so run an external gate off the internal gate-hole? wouldn't that defeat the purpose of the external (and higher flowing) gate?

the mani had it on the #4. not first choice but it was what was available at the time.
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Old 03-03-2008, 01:30 PM   #11
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I would rather have the external WG on the manifold, but some DSM guys do it the way my car is setup. Who ever did my car this way was an idiot and i'm excited to be able to change it all up with the new mani and downpipe.
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Old 03-03-2008, 01:47 PM   #12
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From Maximum Boost:
The bleed-off must vent from a location where the pulses from all cylinders have been collected. This virtually always means the manifold, close to the turbine mounting flange. Symmetry and easy flow paths are ideals for laying out a wastegate system.
It is vital that exhaust gases be given an easy job of changing direction from the route toward the turbine to the bypass through the wastegate. If flow has any difficulty whatsoever changing direction to exit through the wastegate, the ability to control boost in the higher rev ranges may simply disappear.



Fig. 12-9. The wastegate that does not vent from all cylinders uniformly is a bad idea. Nor should it cause reversal of flow from the turbo, as here.

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Old 03-03-2008, 02:02 PM   #13
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Way back before the demise of IMSA's GTP class, I distinctly remember seeing wastegates right off the turbine, post manifold flange. The DSM guys are overboring the IWG port and getting 40mm wg in there. I figured since it was post collector/merge that it wouldn't be too bad. It's still pre-turbine blade.

Ok- just looked at t3 turbine housing I have and it doesn't have much more room than 30mm for a port enlargement.

I found a good pictorial: http://www.jakelatham.com/1gDSM/proj...nal_wastegate/
Mitsu turbo has lots more space.

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Old 03-03-2008, 02:03 PM   #14
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here....



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Old 03-03-2008, 02:08 PM   #15
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I too have seen some IMSA cars with the WG bolted directly to the turbine housing, cool stuff.
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Old 03-03-2008, 02:16 PM   #16
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Quote:
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Now i want vbands.

Vbands are awesome, I got some on my exhaust, very easy to remove and no leakage.
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Post pics of your full exhaust y8s, i wanna see.
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Old 03-03-2008, 02:28 PM   #17
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Quote:
Originally Posted by Joe Perez View Post
From Maximum Boost:
The bleed-off must vent from a location where the pulses from all cylinders have been collected. This virtually always means the manifold, close to the turbine mounting flange. Symmetry and easy flow paths are ideals for laying out a wastegate system.
It is vital that exhaust gases be given an easy job of changing direction from the route toward the turbine to the bypass through the wastegate. If flow has any difficulty whatsoever changing direction to exit through the wastegate, the ability to control boost in the higher rev ranges may simply disappear.



Fig. 12-9. The wastegate that does not vent from all cylinders uniformly is a bad idea. Nor should it cause reversal of flow from the turbo, as here.

yeah i know corky hates the runner 4 solution.

but my boost stability says otherwise. the hardest place to control boost is low boost because you require the most flow through the wastegate.

with a $5 mechanical ball 'n spring valve here's what I get:



i'd say there's no wastegate problem here.
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Old 03-03-2008, 02:31 PM   #18
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i have a feeling if you didnt have a tubular manifold and collector the results wouldn't be the same.
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Old 04-21-2008, 12:58 PM   #19
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Did you buy that transition from acestainless y8s?
http://acestainless.com/index.php?ac...&productId=572

Looks like i'll be building my own DP, modeling it slightly after your example. (simple)
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Old 04-21-2008, 02:59 PM   #20
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www.verociousmotorsports.com is where i got my transition. 2-3" and cut it at 2-1/4" to fit my turbine housing exit
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