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Ben Dowdell
TryHard
SA
GT Limited V8

Posts: 175
Reg: 07-2005

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Monday, December 07, 2009 - 10:20 pm, by:  Ben Dowdell (Ben) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

http://www.superchevy.com/technical/engines_drivetrain/exhaust/0505phr_exh/index.html

very interesting perspective on how to make a system work. A long read but very detailed and worthy for us V8 owners.
Mike Bradberry
Goo Roo
Queensland
V8 UnLimited

Posts: 1698
Reg: 07-2005

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Friday, December 11, 2009 - 05:04 pm, by:  Mike Bradberry (Halflife) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I read the whole article Ben, and of course it makes sense, but I still feel that a lot of it is going to be guesswork and/or experimentation on individual vehicles.
There were certainly some good basics and guidelines to get started though.
I always wondered about oversized pipes not necessarily giving best performance. His article backs that up.
Cihan Aday
Moderator
etuner.com.au
JZZ30

Posts: 3100
Reg: 07-2005

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Saturday, December 12, 2009 - 03:21 pm, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Can be replicated in Engine Analyzer 3.5, standard 1UZ vs Std 1UZ + optimised headers and 1100cfm exhaust (twin 2.5inch with x pipe).

Upload


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The NA 1UZ i'm thinking about building uses this '5th cycle' principal ;) Makes up for lax midrange compliments of intake tuning and big cams.

Graph 1:
You can see the difference in pressure over the standard headers either side of TDC. Something like up to -13psi vacuum during overlap (green vs red line). The two blue lines show intake side pressure, the effect of exhaust scavenging is clear between TDC & 450 degrees.

Graph 2:
Light blue (torque) example is a reasonable application, dark blue is an extreme example that's not as easy to implement as pipe sizing is a little large etc.
Jamie Richards
Tinkerer
St.john's
v8

Posts: 85
Reg: 06-2009

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Sunday, December 13, 2009 - 01:28 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

that's some interesting stuff
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11159
Reg: 11-2004

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Sunday, December 13, 2009 - 10:28 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Cihan, I love your work though I don't profess to understand it. :-)
Cihan Aday
Moderator
etuner.com.au
JZZ30

Posts: 3112
Reg: 07-2005

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Tuesday, December 15, 2009 - 08:29 pm, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks Peter!

I've made the decision to build the 1UZ VVTI in NA trim, in favour of the 2J + single im currently running. Looking for an engine at the moment. Once thats found i'll fly up to Brisbane, sit down with Cameron, tear it apart and work out what can be done.

All good fun.
Ali Saeed
Goo Roo
WA
V8 Limited

Posts: 1506
Reg: 09-2007

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Wednesday, December 16, 2009 - 03:21 am, by:  Ali Saeed (Ali) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

oh i need one of those vvt-i 1uz's..did the celsiors/ls400s come with vvtis in aus?
Mike Bradberry
Goo Roo
Queensland
V8 UnLimited

Posts: 1703
Reg: 07-2005

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Wednesday, December 16, 2009 - 05:49 am, by:  Mike Bradberry (Halflife) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ali, the later LS400's had them. 98' on I think.
Ali Saeed
Goo Roo
WA
V8 Limited

Posts: 1511
Reg: 09-2007

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Wednesday, December 16, 2009 - 07:22 am, by:  Ali Saeed (Ali) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

would be nice to have one of those. 290hp and 400nm stock. exhaust and bfi would probably see you hit 300hp.
Neil Griffiths
Goo Roo
NSW
I have a Cadillac and a Supercharged Manual V8

Posts: 4893
Reg: 07-2005

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Saturday, December 19, 2009 - 06:26 am, by:  Neil Griffiths (Aussiesc) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Upload

Upload

Upload
Ty Mackay
Goo Roo
WA
Soarer TT 1jz-gte

Posts: 1096
Reg: 01-2009

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Saturday, December 19, 2009 - 12:44 pm, by:  Ty Mackay (Duo89) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

omg thats crazy... niceeee
Ali Saeed
Goo Roo
WA
V8 Limited

Posts: 1524
Reg: 09-2007

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Saturday, December 19, 2009 - 09:21 pm, by:  Ali Saeed (Ali) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

whats that out of Neil?

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