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Old 08-21-2011, 05:16 PM   #26
slowgenius
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I am super glad you guys did this testing. In the middle of an engine build and it looks like the 2.5 N/A is a great option.


Thanks! and great work.
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Old 08-21-2011, 05:50 PM   #27
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curious if you guys did any kind of bellmouth around the opening? I know don't see any in the pics. Just wondering if the necking in the opening might effect some of the cylinder to cylinder flow balancing.
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Old 08-21-2011, 06:00 PM   #28
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needs more ej20G testing
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Old 08-21-2011, 06:42 PM   #29
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It'd be interesting to see an ej20g as it appears to be the closest thing to the wrc manifold from the factory.

But it's still old n crusty

Last edited by DSM_Outback; 08-21-2011 at 07:02 PM.
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Old 08-21-2011, 07:06 PM   #30
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Quote:
Originally Posted by Homemade WRX
curious if you guys did any kind of bellmouth around the opening? I know don't see any in the pics. Just wondering if the necking in the opening might effect some of the cylinder to cylinder flow balancing.
No velocity stack of any kind, clay or otherwise. Tried to keep variables down.


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Old 08-23-2011, 12:03 AM   #31
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what about testing the plastic legacy and 08+ wrx manifold?
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Old 08-23-2011, 12:13 AM   #32
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Quote:
Originally Posted by ASF Machine View Post
No velocity stack of any kind, clay or otherwise. Tried to keep variables down.


*ninja employee/personal login edit.
I hadn't noticed claying differences (within reason) to cause much variance, especially that far up stream. It simply reduces the pressure necking that you'll have at that flat 90* bend. With the plenum being here, I don't it would have much effect either way...was just curious
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Old 08-23-2011, 09:22 AM   #33
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Guess I should've worked a little harder on retrofitting the 05+ big plenum/long runner to my motor instead of jumping on the stupid low price of the OBX ITB's....

I have a big plenum/short runner manifold sitting on a shelf if anyone is interested. I'll be keeping the long runner for myself though!

Thanks for the info!!!

Jay
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Old 08-23-2011, 12:50 PM   #34
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OBX made a Tomei knock-off? did you ever slap it on?
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Old 08-23-2011, 01:01 PM   #35
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$600 on the ebays.
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Old 08-23-2011, 01:02 PM   #36
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Nice data! Thanks for this...I'd like to see a retest with some big name manifolds on it...it'd be interesting to see stock vs cossie vs a consistent pnp job like GRIMMSPEED
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Old 08-31-2011, 11:35 AM   #37
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Any updates? Curious about Cosworth's intake.
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Old 08-31-2011, 11:45 AM   #38
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Still making arrangements for round two; being as we're not buying all of the manifolds we're testing, it may take a little bit.
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Old 08-31-2011, 03:09 PM   #39
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Any possibility of seeing flow numbers on stock usdm sti ported?

I have a grimmspeed pnp that i may have around for a little while.
How long do you think the turn around would be and would you want to use your TGV deletes. It will be atleast a month before i have a set.
Its suppose to be of 05 USDM STI

Last edited by bswilmington; 08-31-2011 at 07:03 PM.
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Old 09-01-2011, 02:30 AM   #40
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id like to see grimmspeed ported one tested.
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Old 09-01-2011, 11:41 AM   #41
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Regardless of porting the STI and wrx manifold have 0 plenum.
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Old 09-02-2011, 08:00 AM   #42
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Quote:
Originally Posted by ASF Machine View Post
I'd love to see what someone with access to CFD & wet flow could come up with.

That said, we're not super interested in testing someone's home ported stock WRX manifold and I wouldn't be super excited about even a JDM long runner (I'd probably still do one) as I think we'd find that it's awfully close to a USDM STI.

I have a plastic Leggy XT manifold somewhere that I wanna do and I'd like to maybe test a Cossie, Forsa, Corsa-Veloce, Tomei and maybe a Tomei knockoff.
Awesome thread! Will be very interested to see how the plastic manifold goes, fitting one at the moment to my 04 with cable throttle. Lots of screwing around so hopefully it'll perform well...
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Old 09-02-2011, 08:31 AM   #43
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Quote:
Originally Posted by ionised View Post
Awesome thread! Will be very interested to see how the plastic manifold goes, fitting one at the moment to my 04 with cable throttle. Lots of screwing around so hopefully it'll perform well...
Same here, interested
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Old 09-04-2011, 05:44 AM   #44
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Quote:
Originally Posted by eg33GC View Post
needs more ej20G testing
Quote:
Originally Posted by DSM_Outback View Post
It'd be interesting to see an ej20g as it appears to be the closest thing to the wrc manifold from the factory.

But it's still old n crusty
This.

Compare G to K manifolds.
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Old 09-04-2011, 04:39 PM   #45
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This is an awesome thread. The more hardcore guys can use some of this info to shift their powerbands slightly to the left or right, or add more midrange or topend with choosing long runner short runner right?
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Old 09-11-2011, 05:30 PM   #46
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Just picked up a EJ25 SOHC Big Plenum Long Runner. Won't be until next spring, but I will be doing some before and after dyno testing compared to stock sti. Great thread btw. This data pushed me over the edge to change mine.
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Old 09-11-2011, 05:45 PM   #47
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I need an address to end the Tomei knockoff setup to....

Jay
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Old 09-11-2011, 11:01 PM   #48
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Quote:
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I need an address to end the Tomei knockoff setup to....

Jay
590 N Westgate DR #A, Grand Junction, CO 81505
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Old 09-11-2011, 11:08 PM   #49
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Really great info guys, Thanks for a positive contribution to the community.

Looking forward to seeing the Plastic Legacy Manifold and the Cosworth Manifold tested.

Its been my experience that the Legacy Manifold makes more power with virtually no loss down low. It would be nice to see some actual flow numbers.
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Old 09-12-2011, 01:43 AM   #50
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Quote:
Originally Posted by B.R.E.D View Post
Really great info guys, Thanks for a positive contribution to the community.

Looking forward to seeing the Plastic Legacy Manifold and the Cosworth Manifold tested.

Its been my experience that the Legacy Manifold makes more power with virtually no loss down low. It would be nice to see some actual flow numbers.
Makes more power then what?

IIRC it has 0 plenum as well so its not going to make any good top end.
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