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Old 06-03-2009, 08:48 AM   #51
MartinD
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And it is on sale right now
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Old 06-03-2009, 11:26 PM   #52
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Great test! We need more contributors like you Please add the new Cosworth cams with no other changes and report back. My guess is big gains over 5000rpm and little to no loss down low.
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Old 06-03-2009, 11:52 PM   #53
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Quote:
Originally Posted by wgknestrick View Post
Please, Please Spoonagle
You need to put together a GT35R intake manifold comparison using the STI, Cosworth, LGT, 2.5i, TGV-less Spec C, and Magnus manifolds. You guys are the only ones capable of doing an unbiased and informative comparo. I suspect that there could be stock IM that are capable of gains that near the more $$ aftermarket options (LGT or 2.5i) for most HP levels below 550whp.
+1
It'll pretty much be the thread that can answer many questions
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Old 06-05-2009, 04:23 PM   #54
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Nice test but as Clark mentioned the intake manifold isn't the bottle neck at those power levels so it's no surprise it's just a pretty (and expensive) intake manifold on that application.

I did tune one recently on with a full Cosworth long block and it's clear this manifold doesn't show it's worth until after 6k rpm. This feeling was backed up with the Hydra EMS as you could see the dramatic fuel increases above 6k rpm which remained flat until 8000 rpm. Other problems with this particular car have prevented me from dyno tuning it yet but it will be interesting to see how it compares to the Subaru (non STi) manifold I run on our Time Attack STi.

Comparing the Subaru RS manifold I run to the stock STi manifold there is a loss of bottom end for a gain from 5500 rpm to redline. It will be interesting to see if the Cosworth manifold has any gains over a much more affortable Subaru RS manifold. At least neither will crack

Thanks,
Phil
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Old 06-05-2009, 06:40 PM   #55
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Agreed.. It will be nice to find out when we test this on high hp cars.

My slightly modified JDM STI manifold Flows almost 1300CFM on the bench.. The manifold wont be a flow limit. However, Tuning the plenum size and runner length will change the power band.

Clark
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Old 06-05-2009, 06:51 PM   #56
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Quote:
Originally Posted by Element Tuning View Post
Nice test but as Clark mentioned the intake manifold isn't the bottle neck at those power levels so it's no surprise it's just a pretty (and expensive) intake manifold on that application.

I did tune one recently on with a full Cosworth long block and it's clear this manifold doesn't show it's worth until after 6k rpm. This feeling was backed up with the Hydra EMS as you could see the dramatic fuel increases above 6k rpm which remained flat until 8000 rpm. Other problems with this particular car have prevented me from dyno tuning it yet but it will be interesting to see how it compares to the Subaru (non STi) manifold I run on our Time Attack STi.

Comparing the Subaru RS manifold I run to the stock STi manifold there is a loss of bottom end for a gain from 5500 rpm to redline. It will be interesting to see if the Cosworth manifold has any gains over a much more affortable Subaru RS manifold. At least neither will crack

Thanks,
Phil
Element Tuning
Hey Phil,

Which year RS manifold and are you using DBW? Thanks
I want to see a back to back with the RS manifold and the Cosworth.

cp
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Old 06-17-2009, 10:11 PM   #57
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any updates?
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Old 06-17-2009, 11:00 PM   #58
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Newer Subaru manifolds have much larger runner DIA than almost all other stock manifolds, and thus will flow much more than comparable stock manifolds. They could use a little more plenum, larger TB, and flow balancing.
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Old 06-18-2009, 12:51 AM   #59
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Quote:
Originally Posted by wgknestrick View Post
Newer Subaru manifolds have much larger runner DIA than almost all other stock manifolds, and thus will flow much more than comparable stock manifolds. They could use a little more plenum, larger TB, and flow balancing.
Define newer.
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Old 06-18-2009, 01:04 AM   #60
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07 NA impreza

Clark
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Old 06-18-2009, 08:02 AM   #61
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Quote:
Originally Posted by unclemat View Post
Define newer.
All USDM WRX, STI, LGT, and 07RS manifolds. The "old" GC manifolds have much smaller runners (Pre TGV era).


I believe all these newer manifolds all have about 2.2"-2.25" ID runners IIRC. That is pretty large relative to what you see on other 4cyl.
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Old 06-18-2009, 09:11 PM   #62
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Quote:
Originally Posted by Clark Turner View Post
Making power with turbo cars is about removing airflow limitations. On this car, the manifold was not the limitation. The limitation is somewhere else. Great test Jeff! I bet some cars will come to life with this manifold.

Clark
What would you say is the most restrictive part with a similar setup on the EJ257? Heads? Cams?
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Old 06-18-2009, 09:47 PM   #63
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Thanks alot for the good data. I suspect as said before until you are pushing serious amounts of boost and whp levels are creeping past 500 will this part truly shine.
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Old 06-19-2009, 01:08 AM   #64
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THe turbocharger on this setup.

Clark
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Old 11-21-2012, 10:15 PM   #65
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where are the 35r test results?
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Old 11-22-2012, 08:35 AM   #66
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Really?
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Old 11-22-2012, 10:31 AM   #67
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Quote:
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Really?
Yep.
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Old 11-22-2012, 05:03 PM   #68
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3.5 year old bump huh?

cosworth mani waste, get a 2.5i longrunner, I got one for $100 & got to switch to topfeed, not having to delete the new set of tgv's all over again, yay!

thread to flow comparison, stock sti, cosworth, 2.5i longrunner, and a few more, you'll be surprised at the results of the na oem mani vs cosworth'shttp://forums.nasioc.com/forums/show...low+comparison
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Old 11-27-2012, 02:08 AM   #69
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My only issue with "flow" vs real world is that on the car these manifolds are being pressurized. The flow test works well to replicate a N/A setup that is sucking air through an intake but I feel that the numbers may change with boost, especially with cylinder distribution.

Someone should put together a test with a 500-600whp car and do a run with the stock intake then one with a cosworth intake, or long runner, etc etc. THAT would be interesting to see.
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Old 11-27-2012, 11:29 AM   #70
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The cosworth manifold provides a big power gain at high rpm on higher hp cars. I have tested them back to back. Power over 6000 is higher.
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Old 11-27-2012, 11:48 AM   #71
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longrunner 2.5i testing as well?
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Old 11-27-2012, 11:58 AM   #72
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Quote:
Originally Posted by Clark Turner
The cosworth manifold provides a big power gain at high rpm on higher hp cars. I have tested them back to back. Power over 6000 is higher.
Now much higher
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Old 11-27-2012, 11:58 AM   #73
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Quote:
Originally Posted by Clark Turner
The cosworth manifold provides a big power gain at high rpm on higher hp cars. I have tested them back to back. Power over 6000 is higher.
How much higher
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Old 12-06-2012, 12:15 AM   #74
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Quote:
Originally Posted by ckyguy68 View Post

How much higher
In the 6-700 whp area I'd imagine 35-50 whp gain.
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Old 12-06-2012, 11:19 AM   #75
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Yeah. 600+. At 700whp with good heads and cams, power can be made out to 8500 on the 2.5 with the manifold. At that rpm, the gains are huge.
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