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Hyundai Twinscroll manifold and turbo

 
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WEASEL149  



Joined: 19 Aug 2005
Posts: 592
Location: UK, Sheffield

PostPosted: Tue Oct 03, 2017 8:22 pm    Post subject: Hyundai Twinscroll manifold and turbo Reply with quote

Interesting report. No equal length pipes in sight either:-

http://articles.sae.org/9095/
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Raceboy  



Joined: 01 Mar 2004
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Location: Estonia, Europe

PostPosted: Wed Oct 04, 2017 12:29 am    Post subject: Reply with quote

This is because with twin-scroll having equal length is much less needed.
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CÚdric  



Joined: 27 Aug 2004
Posts: 1684
Location: Sweden

PostPosted: Wed Oct 04, 2017 3:35 am    Post subject: Reply with quote

Its a pretty std setup for a oem turbo engine, minimize manifold volume is they key for pulse utilization, which maximizes available turbine power thus better fuel consumption and response. With vva and twinscroll you minimize cross talk /residual gases in the cylinders.
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CÚdric  



Joined: 27 Aug 2004
Posts: 1684
Location: Sweden

PostPosted: Wed Oct 04, 2017 4:15 am    Post subject: Reply with quote

If you also optimize the turbine efficiency characteristics for higher pulse amplitudes, then things starts to get real good. These are things i do for a living, i wish i could share some plots but that would be bad. Manifold volume really is a key when it comes to response,
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Wed Oct 04, 2017 5:26 am    Post subject: Reply with quote

Yes, for throttle response. Does not affect boost treshold though as much as twin-scroll and/or turbine size (and many-many other things like shaft+impeller mass etc-etc)
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'67 911 Irish Green hotrod, 2.4S
'89 944 S2
'91 944 S2
'78 924
'78 911 SC 2.5 ss Turbo "Martini"
'82 924S/931 "Gulf" racecar, 330 hp, sold
'84 924, turbocharged, sold.
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morghen  



Joined: 21 Jan 2005
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Location: Romania

PostPosted: Wed Oct 04, 2017 5:53 am    Post subject: Reply with quote


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WEASEL149  



Joined: 19 Aug 2005
Posts: 592
Location: UK, Sheffield

PostPosted: Wed Oct 04, 2017 6:04 am    Post subject: Reply with quote

The impressive part for me is the single piece casting of the twinscroll manifold/turbine housing in austenitic stainless.
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