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VOTE NOW.. twin dump or open neck dp.

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Old 12 June 2003, 09:46 PM
  #1  
TARManiAC
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to use with full system. No comments needed, just type "twin dump"
or "open neck".

cheers

Claus
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Old 12 June 2003, 09:52 PM
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Fatman
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Open neck
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Old 12 June 2003, 10:09 PM
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Steve vRS
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Open neck.

I would like to see the computational fluid dynamics that prove one design over the other though Anyone got a copy of Crane handy

Steve
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Old 12 June 2003, 10:12 PM
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Dark Blue Mark
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I might try it on PipeCalc tomorrow

I'm sure someone will claim that an open neck allows maximum flow of exhaust gas, but the backpressure is slightly better on a TD, thus reducing turbo wheel overspeed / running off its curve

MB
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Old 12 June 2003, 10:14 PM
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Dark Blue Mark
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Steve,

Just noticed - a fellow Mechanical Engineer!

MB
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Old 12 June 2003, 10:36 PM
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Delboy2
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Twin-Dump
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Old 12 June 2003, 10:51 PM
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NotoriousREV
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open-neck, haven't some of the twin-dump guys suffered with boost creep? Or was that just open-neck with splitter guys?
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Old 12 June 2003, 10:56 PM
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TonyBurns
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Twin Dump

Tony
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Old 12 June 2003, 11:05 PM
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Brun
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Twin Dump
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Old 13 June 2003, 01:05 AM
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Open neck.(and of these I have found from practical experience that Hayward & Scott is as good or better than anything else I have tried)
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Old 13 June 2003, 04:23 AM
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Danny Fisher
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Depends on the state of tuning.

Dan
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Old 13 June 2003, 03:23 PM
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AJbaseBloke
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Open neck

+ splitter (never was any good following instructions )
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Old 13 June 2003, 06:16 PM
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hades
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Open neck with splitter.

Like most people here, I've never compared two on the same car, so my opinion ain't worth much
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Old 14 June 2003, 11:42 AM
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Leslie
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I've got the PE twin dump and am very pleased with the extra boost I get. But never tried an open neck so not fully qualified to comment.

Les
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Old 14 June 2003, 02:09 PM
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Katana
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Just noticed - a fellow Mechanical Engineer!
Does a final year student count?

Open neck.

edit: speaking of CFD, got any Pro-Engineer blueprint that might help a poor student finish his coursework which he forgot to do?

[Edited by Katana - 6/14/2003 2:09:55 PM]
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Old 19 June 2003, 08:25 PM
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Dark Blue Mark
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Friad not!

Im sure you can bribe a fellow student though

MB
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Old 19 June 2003, 11:10 PM
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john banks
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Open neck with splitter
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Old 06 December 2003, 09:56 PM
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Dark Blue Mark
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I think the open neck might be easier to fit as the TD gets in the way a bit.

As for performance, mixing wastegate gas or splitting it must be absolutely negligible in my opinion. Open next reduces the risk of the actuator catching around the bore of the pipe, as can happen on some TD pipes. Im sure someone on here had a problem (John Banks?)

MB

[Edited by Dark Blue Mark - 6/12/2003 10:13:54 PM]
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