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Old 06-06-2019, 10:07 AM   #51
pennswoodsed
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Join Date: May 2005
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1997 obs ,T?
Greyish ,greenish

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Sure ,
With enough boost (30psi?) and fuel ! and the right cam and turbo(s) I don't think a stock block and crank ,etc would take it for too long !
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Old 06-06-2019, 02:01 PM   #52
pcampbell
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Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default Subaru Cylinder Head Flow Database

Well I meant the heads not the block. I think I found someone who did nearly that much.

https://forums.nasioc.com/forums/sho...highlight=sohc

Last edited by pcampbell; 06-07-2019 at 12:40 AM.
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Old 10-31-2019, 11:10 AM   #53
pcampbell
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What is the cost to have a head or intake flow tested?
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Old 03-25-2020, 09:09 AM   #54
Stoni23
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2003 Wrx
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Quote:
Originally Posted by ASF Machine View Post
Patience young padowan.
You guys here are pretty knowledgable, can yall help??

https://forums.nasioc.com/forums/showthread.php?t=2918706

Link to my 03 build thread. Have a jdm longblock and whatever is in the wrx atm jdm or usdm idk but have two sets of heads. Idk which to use, maybe yall can help with the phasing stuff too, not sure what phase engines I have
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Old 03-25-2020, 10:08 AM   #55
spoolinsti05
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Location: NY
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2005 TickingTimeBomb
Jr tuned TT Sleeved

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Quote:
Originally Posted by Stoni23 View Post
You guys here are pretty knowledgable, can yall help??

https://forums.nasioc.com/forums/sho....php?t=2918706

Link to my 03 build thread. Have a jdm longblock and whatever is in the wrx atm jdm or usdm idk but have two sets of heads. Idk which to use, maybe yall can help with the phasing stuff too, not sure what phase engines I have
Iirc anything with a 6 bolt bell housing is phase 1 if it's a usdm chassis you need to run the usdm heads or adapt the hall effect sensor. Or convert your ECU to JDM setup.
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Old 03-25-2020, 10:19 AM   #56
spoolinsti05
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Jr tuned TT Sleeved

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Quote:
Originally Posted by gunt View Post
these questions could be answered somewhere [ i have spent a good time looking ] but as with the bore size , i have a question with regards to troth size , on std valves size are you increasing it if so how much [ some might not like to say by how much ] we usually get to open them by 1mm on std valves on other brand engines / and this is where i wonder does everyone increase troth size when using bigger valves or are new bigger seats or keeping std troth to increase venturi ,

i seen someone rote that the newer std heads are flowing near b16a head figures , this is a point where i see subaru lacking as these cfm figures obivouslly flow perfectlly adiquatlly for 16-1800cc and the increase in subaru cc only increase the restriction and therfore the hugh fall off in what we see the graphs , cam are really only an attempt to sort the issue
has anyone got a set of cams cut to suit the head they have flowed

Cheers
I have the d25 heads ported Chambers all matched to (52cc) on a 100mm bore extensive bowl porting with 1mm added before the valve seats. Blended into the ports with extensive matching to the dog leg and straight port exhaust ports. Std aftermarket valves GSC super alloy valves, GSC s2 cams and they do great shimmed GSC beehive springs. On a 6466 turbo. I'm very happy with the combo. Great response great flow all throughout the rpm range.

If you look you'll see that GSC s2 cams are basically a equal grind to a jdm big port cam.
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Old 01-16-2021, 08:54 AM   #57
Kremer930
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2008 WRX Sti Spec R
WRC blue

Default IAG stage 5 heads vs Crest cast heads

Hi. Thanks for the useful thread with flow rates. Does anyone know what a dual avcs 257 head flows with plus 1 valves and 272 Kelford cams vs IAG stage 5 vs the Crest CNC cast heads? Thanks
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Old 02-22-2021, 08:55 PM   #58
Scargod
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2007 STI
silver gray metallic

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Quote:
Originally Posted by Kremer930 View Post
Does anyone know what a dual avcs 257 head flows with plus 1 valves and 272 Kelford cams vs IAG stage 5 vs the Crest CNC cast heads? Thanks
W25 heads: I ported and unshrouded the heads myself. They were CC'd and bench flowed after Supertech +1mm valves were installed. Assembly work and testing was done by Heads Up Machine in NY.
Flow average of 284/219 @ .445" lift
Kelford 220-C cams (272/268 for DAVCS).
My engine made 470 HP on 24.0 PSI, running Premium gas with Torco additive.
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