Unique Autosports Rb25det Exhaust Manifold

[ovabooster]

any1 know where i can get a HPI exhaust manifold?

[frozenwaffles]

yeah? just jap?

[SPINR33GTS]

Why does everyone want gay stainless steel manifolds that crack etc heat fatigue, 6 boost manifolds and ones made from steel are 10 times better in theyr can b heated and cooled alot more times without damage plus they have been found to retain more heat and decrese spool up times of liek 2-5% percent from memory because they retain more heat the exhaust gas flow is quicker theirfore making the turbo spool faster, the only downside in weight thats all but if ur actually going to drive ur car ie do afew km's in it wouldnt u want something that is going to last....

Thanks Rory

note a link for some 6 boost manifolds:

http://www.horsepowerinabox.com/HPIAB2/category15_1.htm

[frozenwaffles]

i want a 6boost one but there is a bloody 4-6 week wait on them. i need my car back now as its my daily driver and its in peices as my stocker is cracked...

i have been told that the stocker will only crack due to running to lean....??? any comments?

[juggernaut1]

I have recently had my 6boost (SR20) ex manifold and stock SR20 inlet manifold honed by Andrew Sanders (along with my turbo compressor cover). I don't have the before/after flow results on me but will post up later for anyone interested in this process.

[The Mafia]

SLY33, do you have any results on your Extrusion honed manifold yet?

I am keen to get this done.

[juggernaut1]

OK for what its worth 6Boost ex manifold and standard blacktop inlet manifold (SR20) before and after extrude honing at 28 inches. Please note that my mandate to Andrew Sanders re exhaust manifold was not to equalise flow as I didn't want to increase the volume too much in runners 2 & 3 and loose any response. And my mandate re the inlet manifold was to equalise flow - which is nearly perfect. Just an example of the benefits of extrude honing.

6 Boost Exhaust Manifold

Before.............After

1 250............260

2 220............245

3 222............247

4 252............262

Standard SR 20 Blacktop Inlet Manifold

Before.............After

1 254............300

2 257............306

3 270............306

4 254............300

For comparison sake I pasted this RB exhaust manifold flow data previously posted in this thread but Im not sure at what pressure the flow tests were done?

Some flow rates for you guy's from extrusion flow honing standard manifold ,hks cast iron manifold and hks cast iron flow honed

standard manifold .........hks cast ...............hks cast flow honed

1 159.7.........................170.7............................194.8

2 162.4.........................166.6............................203.4

3 160.7.........................178.7............................198.7

4 150.1.........................183.6............................200.3

5 149.9.........................182.2............................207.8

6 173.3.........................184.7............................202.8

[Cubes]

Remember flow isn't the be all and end all.

Collector design has a huge influence on performance.

[juggernaut1]

^^^^^ agreed but IMO the 6Boost manifolds has one of the best collectors in the business. Mercury Motorsport made 562 rwhp from their stock stroke sr20 with a 6 boost mani and GT35 turbo. This car also ran 10 sec quarters with manual box.

My manifold is also unique in that it has been custom made to suit one of the new round collector v-band Tial cast stainless housings for my HKS GTRS turbo.

Edited February 14, 2008 by juggernaut1

[2rismo]

i want a 6boost one but there is a bloody 4-6 week wait on them. i need my car back now as its my daily driver and its in peices as my stocker is cracked...

i have been told that the stocker will only crack due to running to lean....??? any comments?

Suggest you get in touch with Leigh from Extreme Turbo Manifolds if you need something sooner. The link is in my sig.

[juggernaut1]

Found this link on power porting process of before and after hp figures done on a test mule RB30 engine when Specialised Power Porting was in its infancy.

http://autospeed.com/cms/A_0622/printArticle.html

[GeeTR]

My manifold is also unique in that it has been custom made to suit one of the new round collector v-band Tial cast stainless housings for my HKS GTRS turbo.

Droooool

[juggernaut1]

Yes they are nice

http://www.tialmedia.com/graphics/SS%20housings/gt28%205.jpg

[WARLORD]

a bit of a update on a old topic but...... i just spoke to Abrasive Flow Engineering who does or did work for uas on hone and extrude and his exact words are for a rb25det manifold.

"""don't wast your time and money they don't flow as good as a hks manifold ""

and

"""for $900 to extrude and hone i would go and get some thing better"""

f#%$ me.this is from the guy who does them while some companies are begin for work due the the $$$$ crises this guy has shocked the sh#@ out of me so ..........after reading this post and many like it over the years and looking at the figures people have posted on flow have we all been grossly mislead by people in the industry have figures been made up for the trusting customer.

what is one to thing !!!!!!!

if anyone does reply do it here.: http://www.skylinesaustralia.com/forums/Ex...47#entry4450747

Edited February 28, 2009 by WARLORD