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Old 08-08-2016, 02:21 PM   #51
outfrontmotorsports
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Did you ever get a response on this one?
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Old 08-17-2016, 05:08 PM   #52
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Instead of creating a new thread I'm just going to post my question here in hopes of getting some personal feed back from people that have used NA manifolds on turbo 2.5 engine builds.

I'm looking at picking up a DBW impreza manifold and using it on my 05 sti that has pocket ported heads, upgraded valve train with stock cams which will be running a FP Green turbo with supporting mods and FMIC.

I know about the need for phenolic spacers and new fuel rails in order to use this manifold already since I've researched quite a bit on the subject.

The question is do you think this manifold will produce a favorable power band using a FP Green turbo or is this turbo to small to see any benefits?
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Old 08-20-2016, 03:42 PM   #53
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I'm currently rebuilding my motor and am left with just installing the intake system and have a source to a NA manifold. I'm wondering if anybody that has experience with this manifold wants to put their input in on if this manifold would hinder the performance of a build that has pocket ported heads and upgraded valve train (heads had to be rebuilt) which still will be running stock cams and a FP Green HTZ turbo.
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Old 08-22-2016, 08:55 AM   #54
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Search for the asf machine thread comparing the stock manifold, the na manifold to a few others.
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Old 08-22-2016, 11:14 AM   #55
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Originally Posted by slowgenius View Post
Search for the asf machine thread comparing the stock manifold, the na manifold to a few others.
Thanks I've already read that thread a few times. It is an awesome I might say but still have my question of if the FP Green turbo would be large enough to run with out dramatically hindering low end performance on my build. I do plan on going with a larger Borg Warner turbo when I have the extra funds to go rotated.

I'm willing to give up a bit of bottom for more upper on my build atm and really like the concept of the more equal volume runners for tuning purposes and longevity for a daily driver.
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Old 08-22-2016, 01:01 PM   #56
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My take is the na manifold doesnt noticably hinder any performance with the larger plenum, its cheap, and easy.

However, actually needing one is really stretching for the last tiny bit of power. The stock manifold with the tgvs deleted will get you what you need.
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Old 08-23-2016, 02:05 PM   #57
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Originally Posted by slowgenius View Post
My take is the na manifold doesnt noticably hinder any performance with the larger plenum, its cheap, and easy.

However, actually needing one is really stretching for the last tiny bit of power. The stock manifold with the tgvs deleted will get you what you need.
I agree with you and I'm at the point of my build where I need to install the top end of my rebuild.

At the moment I have to get the carbide debur bits to port my TGV or I can pick a NA manifold up for under a $100. I still will port the tgv housings and sell them if I pick up the na manifold along with doing a mild port job on the na manifold to clean up any rough castings.

I think I might bite the bullet and just purchase the manifold this weekend.

Thanks for your response since I've posted on several forums and even sent pm to a few people that ran them on smaller turbos but have had minimal educated feed back.
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Old 11-04-2016, 10:07 PM   #58
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Haven't been able to find a conclusive answer to this.

The adapters that radium engineering sells for the Spec C manifold, will they work with the 2.5i long runner? They are both top feed, but is the bolt spacing the same?

http://www.radiumauto.com/Top-Feed-F...6279&Kits=1640
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Old 11-08-2016, 04:01 AM   #59
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Moore Performance Makes a nice set.
I have their older version and I like them.


http://shop.mooreperformanceparts.co...i-2281583.aspx
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Old 11-15-2016, 11:47 PM   #60
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I turned two plugs to simulate the fuel injectors. They fit tightly in the holes and that located the rail and where I needed to weld my brackets.
https://2008subarutrack.shutterfly.com/239#239
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Old 11-16-2016, 06:43 AM   #61
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I just bought these
they work with 2.5i and JDM long runner, in case I ever swap between the two
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Old 11-16-2016, 08:38 AM   #62
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Originally Posted by Hyper View Post
I just bought these
they work with 2.5i and JDM long runner, in case I ever swap between the two
And they seem scalloped enough to work with radium fuel dampers. Awesome, thanks for the link!
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Old 01-18-2017, 09:59 AM   #63
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So, after trying to install the manifold on my car last weekend, I quickly noticed that the Radium fuel rails with fuel pulse dampers, are a confirmed no go on the 2.5I setup, on an engine with AVCS that is. The FPD's clash with the AVCS solenoid.



Even when taking the FPD's off, the bulge on the fuel rail itself is enough to clash.

I bought some IAG fuel rails, so hopefully they'll work, otherwise, Outfront rails it is.
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Old 01-18-2017, 10:03 AM   #64
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could always go with flat4 rails/fuel kit too.
They are known to work with that manifold and AVCS....it is tight by the solenoid connecter tho.
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Old 01-18-2017, 11:51 AM   #65
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Damn, I just bought those rails. Luckily I don't have avcs, but them not clearing it makes me question their quality. I already have their rail adapter and will have to grind off some of the manifold or the adapters for them to sit flat...yay.
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Old 01-18-2017, 12:39 PM   #66
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Quote:
Originally Posted by 2slofouru View Post
Damn, I just bought those rails. Luckily I don't have avcs, but them not clearing it makes me question their quality. I already have their rail adapter and will have to grind off some of the manifold or the adapters for them to sit flat...yay.

Are you running spacers ?
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Old 01-18-2017, 12:48 PM   #67
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Are you running spacers ?
I'd better not need them since my heads have no avcs. Was going to use one dampers in the rails, unless they won't fit, then the plan was to plug those holes and put the dampers elsewhere. Their dampers look too complex to be reliable and are bulky even if they do special things.
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Old 01-19-2017, 09:11 PM   #68
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I realize the radium adapters are supposed to be a simple bolt on install, but the card in the package states there are install instructions on their website in the item description. I can't find a link in the description or on their site anywhere. Just wanted to make sure having to shave the manifold edge was a normal issue to be sure they will work correctly with my long runner 2.5i manifold. Not like it won't be getting a lot of things shaved off anyway, just seems odd they wouldn't make the part more precise. Their fuel rails still haven't arrived and I haven't made a choice on injector size yet, guess I could just try the old 2.5i injectors to confirm fitment.

Also, can anyone confirm whether or not the oem dampers will fit the radium rails?
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Old 01-19-2017, 09:44 PM   #69
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Quote:
Originally Posted by 2slofouru View Post
I realize the radium adapters are supposed to be a simple bolt on install, but the card in the package states there are install instructions on their website in the item description. I can't find a link in the description or on their site anywhere. Just wanted to make sure having to shave the manifold edge was a normal issue to be sure they will work correctly with my long runner 2.5i manifold. Not like it won't be getting a lot of things shaved off anyway, just seems odd they wouldn't make the part more precise. Their fuel rails still haven't arrived and I haven't made a choice on injector size yet, guess I could just try the old 2.5i injectors to confirm fitment.

Also, can anyone confirm whether or not the oem dampers will fit the radium rails?

This help?
http://data.radiumauto.com/PublicDocs/19-0090F.PDF
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Old 01-19-2017, 10:43 PM   #70
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How you do dis????????????? Was it in the rail instructions? There were no links when I searched. Thanks!
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Old 01-19-2017, 10:55 PM   #71
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Originally Posted by 2slofouru View Post
How you do dis????????????? Was it in the rail instructions? There were no links when I searched. Thanks!
Very first line of the description?

http://www.radiumauto.com/Top-Feed-F...baru-P631.aspx
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Old 01-19-2017, 11:25 PM   #72
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Originally Posted by cnstman View Post
Very first line of the description?

http://www.radiumauto.com/Top-Feed-F...baru-P631.aspx
I should have checked the fuel rails instead, apparently, but the card that told me to look in the item description (that came with the adapter) was in the package...for the adapters here: http://www.radiumauto.com/Top-Feed-F...old--P641.aspx

There is no link in the description for any additional information for the adapters. The fuel rails are designed to bolt on and will fit many subaru applications due to the two different sized insulating spacers...which is why I bough them. Either way, after reading the info in the fuel rail link, there is nothing about fitment issues. It must be a "normal" thing to deal with in "custom" installations.
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Old 01-19-2017, 11:59 PM   #73
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Did you use the taller or shorter insulating spacers? My mistake, just noticed the tallers with bolts in them in the pic



Quote:
Originally Posted by leonbmx View Post
So, after trying to install the manifold on my car last weekend, I quickly noticed that the Radium fuel rails with fuel pulse dampers, are a confirmed no go on the 2.5I setup, on an engine with AVCS that is. The FPD's clash with the AVCS solenoid.



Even when taking the FPD's off, the bulge on the fuel rail itself is enough to clash.

I bought some IAG fuel rails, so hopefully they'll work, otherwise, Outfront rails it is.
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Old 01-20-2017, 12:42 AM   #74
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Quote:
Originally Posted by 2slofouru View Post
Did you use the taller or shorter insulating spacers? My mistake, just noticed the tallers with bolts in them in the pic
I used the tall ones, they are perfect fit with ID1700's.

Radium's parts are top notch, I totally blame myself for not doing more research prior to buying them.
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Old 01-20-2017, 12:52 AM   #75
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Oh, they aren't designed for subies with avcs, or is something else interfering as well? I've read of people using manifold spacers. I always miss small details like that, gets expensive.



Quote:
Originally Posted by leonbmx View Post
I used the tall ones, they are perfect fit with ID1700's.

Radium's parts are top notch, I totally blame myself for not doing more research prior to buying them.
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