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Old 02-17-2009, 02:06 PM   #1
SW00P_G
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Default Slowmotion EL manifold vs. Perrin EL Manifold

I have finally decided to part with my Perrin EL header after several years of toying the idea. Slowmotion Motorsports has built a manifold incorporating 1.5" id primaries and a 2.5" id up-pipe. Once the header was installed it ran MUCH to lean and needed immediate tuning. So far there has only been a rough tune as it's the off season and there are some more goodies I have in store. Anyway, enough with the talk and on with the pics. Keep in mind that I took these pics myself so forgive the quality.






This is a pic showing the difference between the perrin and the new piping. Looks better in person...





The before and after tune consisted of only my wastegate speing being used resulting in ~20psi boost for both runs. After the header was installed I removed 2 deg of timing for a max of 17 degrees as the power on pump was surpsrising. I believe that with more cam timing adjustments and ignition timing I'll be able to get close to 500whp on pump gas.

Quick mod list

2002 WRX
EJ257 built block
EJ205 race ported and built heads matched to 2.5 bore
Crower stage 4 cams
Jun adjustable cam gears
GT35R .82 exhaust housing
HKS carbon/ti exhaust
AEM EMS
1000cc injectors
twin walboro in tank
APS fuel rails
Aeromotive FPR
PPG str8 cut dogbox
....... forgetting things I'm sure


Just thought I would post as I'm very happy with the results.
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Old 02-17-2009, 02:13 PM   #2
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Sweeet.
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Old 02-17-2009, 02:14 PM   #3
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Very nice jump in numbers with minimal tuning.
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Old 02-17-2009, 02:14 PM   #4
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see, ANOTHER thread showing BIGGER is BETTER!!


Nice job!
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Old 02-17-2009, 02:15 PM   #5
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results are incredible for the quoted setup, 35r @ 20 psi with 2 degrees less of timing

price and avail on this new header?
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Old 02-17-2009, 02:24 PM   #6
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Does it fit with a moroso pan? Is that thickwall stainless. Looks like it would be easy to make this a twin scroll design.

Nice work and thanks for the experiment.
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Old 02-17-2009, 02:32 PM   #7
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how much are the headers?? they look good
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Old 02-17-2009, 02:33 PM   #8
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stock Location???
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Old 02-17-2009, 02:36 PM   #9
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Pretty sick set up!

Mike
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Old 02-17-2009, 02:56 PM   #10
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Awesome numbers and set up.
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Old 02-17-2009, 03:15 PM   #11
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Quote:
Originally Posted by Boxer112 View Post
stock Location???
based on the orientation of the flange in the pics, no.

based on him running a gt35r, no.

or are you asking if a stock location turbo piece will be made?

this almost seems like a one off piece or a prototype based on the # of welds and the lack of mandrel bends....

Last edited by Phatron; 02-17-2009 at 03:20 PM.
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Old 02-17-2009, 03:50 PM   #12
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Quote:
Originally Posted by SuperSTI View Post
see, ANOTHER thread showing BIGGER is BETTER!!


Nice job!

You do realize that 1.5" is not that big....

Swoop-did he use 1.25" sch10 piping for the primaries? I'm finishing up a header right now with the 1.25" sch10 primaries and was wondering how it is going to work out and it looks promising from your results. Nice job
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Old 02-17-2009, 03:52 PM   #13
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This was a prototype peice.
They are selling it now I believe, I do not know what the price is.
This design was created to allow for a single or twin-scroll setup. Mine is single.
It is thickwall, no need to wrapping
I would say that if the perrin would not fit with a moroso pan then this will probably not either.

I would call them for pricing, the website with contact info is http://www.slowmotionmotorsports.com/


The primaries are 1.5" inside diameter, I can call them for more details.

Last edited by SW00P_G; 02-17-2009 at 03:55 PM. Reason: addition
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Old 02-17-2009, 07:24 PM   #14
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Quote:
Originally Posted by Phatron View Post
based on the orientation of the flange in the pics, no.

based on him running a gt35r, no.

or are you asking if a stock location turbo piece will be made?

this almost seems like a one off piece or a prototype based on the # of welds and the lack of mandrel bends....
I do most of the subby work for slomo,Ryan the welder who made this manifold also made a jig for the mani and can make more and like previosly said it can be single,twin or stock location with the appropriate up-pipe.I built the motor for him and am amazed at the increase in hp and trq.
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Old 02-17-2009, 07:51 PM   #15
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I might be stopping by in 6 months or so when I'm in the market for a header! I didn't know slomo did fab work like this!
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Old 02-17-2009, 10:06 PM   #16
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yrs I have been helping slomo with the subby end for a while now and can say there is nothing that Cory or Ryan can't fab and tig ---I have seen some really nice IC pipe setups and stainless exhaust pieces.
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Old 02-18-2009, 05:05 AM   #17
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wow that's look amazing
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Old 02-18-2009, 01:38 PM   #18
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I'm also curious about the size of the primaries. Is it 1.25" or 1.5" pipe? Is it schedule 10 or 40?

Thanks,

Mickey
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Old 02-18-2009, 01:44 PM   #19
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While people on on the subject of the manifolds what is the ID of the stock primaries and the ID at the collector?
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Old 02-18-2009, 01:49 PM   #20
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Now it's time to make an un-equal length header
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Old 02-18-2009, 01:57 PM   #21
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i got on the website and sent them an email, and still have not gotten a responce, do you think they will be able to make a stock location oem subaru twinscroll set?
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Old 02-18-2009, 02:48 PM   #22
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Quote:
Originally Posted by SuperSTI View Post
see, ANOTHER thread showing BIGGER is BETTER!!


Nice job!
Sorry... there's absolutely no similarity between this and AMR's "design". Looks like you still haven't found those critical thinking skills

This header has 1.5" primaries... NOT 2". It also has properly sized secondaries, from the looks of things.
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Old 02-18-2009, 02:59 PM   #23
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Quote:
Originally Posted by moswald80 View Post
I'm also curious about the size of the primaries. Is it 1.25" or 1.5" pipe? Is it schedule 10 or 40?

Thanks,

Mickey
I'm sorry as I'm not the person making this, but I will get more info. I do know for sure that the internal diameter of the pimaries are 1.5", saw it myself, I do not know the outside diameter I would bet that its pretty darn close to 2". I'll see if I can find more pics.

Quote:
Originally Posted by CoolRex View Post
While people on on the subject of the manifolds what is the ID of the stock primaries and the ID at the collector?
I do not know the size of the stock primaries as I didn't have a stock manifold. I do know that the Perrin primaries were ~1.25" internal diameter though, which were a little smaller than the exhaust ports.

Quote:
Originally Posted by seanathanq83 View Post
i got on the website and sent them an email, and still have not gotten a responce, do you think they will be able to make a stock location oem subaru twinscroll set?
I'm sure they would make whatever you wanted. But I'd bet that picking up the stock piping would be your cheapest option. Although I don't know what you are trying to accomplish. My setup is made for a rotated kit, not a stock location.

I need to stop out there and have a talk with them, just been busy since SF4 came out yesterday!
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Old 02-18-2009, 07:49 PM   #24
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Quote:
Originally Posted by remowgn View Post
Sorry... there's absolutely no similarity between this and AMR's "design". Looks like you still haven't found those critical thinking skills

This header has 1.5" primaries... NOT 2". It also has properly sized secondaries, from the looks of things.
You do what for a living????

Right.

I was pointing on the gains.

A full 2" header flows more than a 1.5" header. Also, I spoke to full race before these headers were available, they even confirmed for high hp cars and drag racing 2" primaries are a must.

Also wanted to point out that UR's twin scroll kit is a full 2" as well.
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Old 02-18-2009, 07:58 PM   #25
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well the ones i have found are about 700-1000
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