to use with full system. No comments needed, just type "twin dump"
or "open neck".

cheers

Claus

 

Open neck

 

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

 

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

 

Steve,

Just noticed - a fellow Mechanical Engineer!

MB

 

Twin-Dump

 

open-neck, haven't some of the twin-dump guys suffered with boost creep? Or was that just open-neck with splitter guys?

 

Twin Dump

Tony

 

Twin Dump

 

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)

 

Depends on the state of tuning.

Dan

 

Open neck

+ splitter (never was any good following instructions )

 

Open neck with splitter.

Like most people here, I've never compared two on the same car, so my opinion ain't worth much

 

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

 

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]

 

Friad not!

Im sure you can bribe a fellow student though

MB

 

Open neck with splitter

 

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]