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brand new stainless 931 turbo manifold !!

 
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anthonimartini  



Joined: 17 Feb 2020
Posts: 240
Location: portland oregon

PostPosted: Sat Jan 08, 2022 2:42 pm    Post subject: brand new stainless 931 turbo manifold !! Reply with quote

not sure if anybody here has seen this but it looks neat!

https://www.fiammenghiitalia.com/en/prodotto/stainless-steel-exhaust-manifold/
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2596
Location: MI

PostPosted: Sat Jan 08, 2022 3:46 pm    Post subject: Reply with quote

Wow!
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Cedric  



Joined: 27 Aug 2004
Posts: 2600
Location: Sweden

PostPosted: Sat Jan 08, 2022 7:40 pm    Post subject: Reply with quote

I was pretty excited until i saw the final product. A cast steel copy of the Rhd 931 manifold would be nice to have
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Mike9311  



Joined: 14 Dec 2004
Posts: 1678
Location: Chicago-ish

PostPosted: Sun Jan 09, 2022 3:17 am    Post subject: Reply with quote

I guess I am not the only one scanning these things


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gegge  



Joined: 27 Jul 2007
Posts: 1124
Location: Sweden

PostPosted: Tue Jan 11, 2022 10:00 pm    Post subject: Reply with quote

A simple log is far from "optimized design"

That is inferiour to the cast OEM manifold I am afraid.
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Cedric  



Joined: 27 Aug 2004
Posts: 2600
Location: Sweden

PostPosted: Tue Jan 11, 2022 11:30 pm    Post subject: Reply with quote

gegge wrote:
A simple log is far from "optimized design"

That is inferiour to the cast OEM manifold I am afraid.


the standard manifold surely has a better design for a log manfiold with smoother bends. However according to my GT power calculations the RHD manifold have better cylinder balance when the WG opens, and would be better for knock mitigation on cylinder 4.
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Beartooth  



Joined: 05 Apr 2022
Posts: 198
Location: Roberts, MT

PostPosted: Thu Oct 13, 2022 7:46 am    Post subject: Reply with quote

I've been paging through Corky Bell's book on turbocharging, and in the section on exhaust manifolds/headers, he states that a simple log manifold with the turbo on one end and the wastegate on the other is sub-optimal. I'm not sure if there's an issue with efficiency, if it might feed the turbine with enough exhaust to overboost even with the wastegate open, or what, but I was a little disappointed when I saw what I thought was that type of standard log manifold on my 931. After I got it off, I realized it's not like that; there's a separate passage running most of the length of the manifold from near the turbo flange back to the wastegate outlet. Again, I don't fully understand if it's a necessary element, necessary only in some cases, or just nice to have, but it was important enough for Porsche to put in the effort to incorporate.

Anyway, I know this is from a few months back, and I applaud the effort somebody put in, but I'd only consider the manifold in question if I couldn't get my hands on an original cast manifold. And if I were to run it, I'd do a number of controlled test runs looking for erratic operation before I'd trust it. What would be really cool to see would be a four-into-one or 2-2-1 tube manifold, probably with the wastegate pipe picking up just behind the turbine flange and looping over the top back to the original wastegate connection. But that could be a fabrication and packaging nightmare...
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