05+ manifold project

00LGTP · 09-09-2010, 09:39 PM

i am currently in the process of putting a 07 2.5i IM on my 2.5rs.

im pretty sure i have everything i need planned out, just need to get parts and physically do it.

i have found very little info about people doing this, which is why i wanted to see what info you guys have obtained.

any info will be helpful, im open to all suggestions.

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williaty · 09-11-2010, 01:35 AM

The only difficulty is in mounting the throttle since you have a cable throttle and the 05+ IM is for DBW. There's some brackets and things you'll have to have custom fabbed at a machine shop to allow the cable throttle to function.

wmdoucette · 09-12-2010, 10:33 PM

and fab some sort of port for the Idle air to flow through. My best idea right now is to hog out the hole in the TB, tap an AN Pipe-flare fitting in and do the same somewhere on the intake manifold.

williaty · 09-12-2010, 10:34 PM

Isn't the entire idle-air apparatus integrated into the throttle body?

00LGTP · 09-14-2010, 11:40 PM

i compared gaskets and came to the conclusion that my stock RS TB will bolt up, but that stupid IACV passage has to be in the way.

i have a TB spacer, so i block it off on the manifold side, drill a hole/install fitting, run a hose from that fitting to the IM plenum.

done!

cable will be easy, small bracket.

the map sensor!

im going to port out on of the EGR holes, only need about a 1/8" all the way around, polish it up nice and pray i did a good job and that O ring will seal. i can always use sensor save gasket sealer.

bolting it up will be no harder of bolting on another plate to the stock EGR threads and drilling holes with bolts for the map.

you guys know it will work!

if you guys get a chance, let me know what you think about this for the fuel system.

http://www.rs25.com/forums/f13/t1427...-his-hose.html

renob123 · 09-15-2010, 11:39 AM

Nice! Thanks for putting this out there for everyone.

Aside from zzyzxx running one in the 300hp NA car, does anyone have any info on the gains that can be achieved by swapping to the newer manifold?

Jacob

00LGTP · 09-15-2010, 05:31 PM

Quote:

Originally Posted by renob123

Nice! Thanks for putting this out there for everyone.

Aside from zzyzxx running one in the 300hp NA car, does anyone have any info on the gains that can be achieved by swapping to the newer manifold?

Jacob

i havent found anything, which is why i made this thread.

more brains on the job is a good thing.

renob123 · 09-15-2010, 05:33 PM

Quote:

Originally Posted by 00LGTP

i havent found anything, which is why i made this thread.

more brains on the job is a good thing.

Ahh, so you plan to post some of the gains or a flowbench or something? I'm very interested.

Jacob

00LGTP · 09-15-2010, 05:39 PM

ill post pics and explain how i did things but i cant be bothered by a flowbench.

dont get me wrong i would love too, but im a full time college student and (Automotive Technology and Management) i have limited time.

renob123 · 09-15-2010, 05:47 PM

Quote:

Originally Posted by 00LGTP

ill post pics and explain how i did things but i cant be bothered by a flowbench.

dont get me wrong i would love too, but im a full time college student and (Automotive Technology and Management) i have limited time.

That's cool. I was asking about gains, and you said that was why you made this thread. I'd call it more of a how-to, which is great, but I wanted to see the gains.

Jacob

00LGTP · 09-15-2010, 05:52 PM

Quote:

Originally Posted by renob123

That's cool. I was asking about gains, and you said that was why you made this thread. I'd call it more of a how-to, which is great, but I wanted to see the gains.

Jacob

lol yea guess " how to" is more like it.

butt dyno for now, real dyno when the chance pops up in the future.

renob123 · 09-15-2010, 05:55 PM

Quote:

Originally Posted by 00LGTP

lol yea guess " how to" is more like it.

butt dyno for now, real dyno when the chance pops up in the future.

Cool. Until then, does anyone else have any ideas of the actual gains from this swap? I've never heard of any. I've just heard zzyzxx saying they used it.

Jacob

Storm · 09-16-2010, 08:33 AM

Contact 42 Autosports. They've done it and came to the conclusion that the stock intake tract can't provide enough air to make it an all out winner. There are more details, but you should contact them to get the whole story.

Jay

00LGTP · 09-17-2010, 01:49 PM

^^ send them an email, waiting for a reply.

does anyone know if stock 2.5i injectors will work with a WRX/STI aftermarket fuel rail?

gotta spend a certain amount on a FPR, so might as well do it while i have it apart and do a fuel rail/FPR combo. ebay sells come kits with lines and everything i need. normally i wouldnt mess with ebay stuff but machined aluminum is machined aluminum.

RaineMan · 09-17-2010, 02:02 PM

Quote:

Originally Posted by Storm

They've done it and came to the conclusion that the stock intake tract can't provide enough air to make it an all out winner.

Jay

So what you are saying is that the heads outflow the stock intake?

00LGTP · 09-17-2010, 02:51 PM

Quote:

Originally Posted by RaineMan

So what you are saying is that the heads outflow the stock intake?

i think he means the stock intake tubing cant flow enough to see gain.

its not all about the volume of air, the runner lengths are long and P&P from the factory.

RaineMan · 09-17-2010, 02:57 PM

Quote:

Originally Posted by 00LGTP

i think he means the stock intake tubing cant flow enough to see gain.

its not all about the volume of air, the runner lengths are long and P&P from the factory.

OK... I think I get you. The IM can handle more flow than the stock tubing and filter provide. Certainly an good case for intake modification if I've ever seen one.

What about the heads? Can they handle more air than the stock intake can provide as well? Generally that's where you hit a wall when it comes to NA engines... if the heads flow less CFM than the IM or intake tubes then modifying the intake won't do you any good anyways.

Storm · 09-17-2010, 04:18 PM

Exactly.....the torquebox made for pre-05 cars has a small inlet and the CAI they developed for those cars ended up not being a good match for that manifold. The torquebox made for that unit was better, but still short of what they had prior to bolting it on. IIRC, the best gains came from a 4" cone filter (from a GTR) taped directly onto the TB.

The smaller volume of the 05 torquebox works well enough, but the inlet to it needs opened up substantially to let it work.

Jay

RaineMan · 09-17-2010, 04:24 PM

So I take it the intake was redesigned for 06+? Just trying to figure out where my car fits in this.

00LGTP · 09-17-2010, 04:48 PM

Quote:

Originally Posted by RaineMan

So I take it the intake was redesigned for 06+? Just trying to figure out where my car fits in this.

you already have the manifold i am putting on.

here is the fuel rail/line kit i was talking about earlier.

http://cgi.ebay.com/ebaymotors/High-...mZ280562461348

williaty · 09-17-2010, 04:56 PM

Quote:

Originally Posted by RaineMan

So I take it the intake was redesigned for 06+? Just trying to figure out where my car fits in this.

05 and 06 are pretty much the same. The big change is between 04 and 05.

RaineMan · 09-17-2010, 05:37 PM

Quote:

Originally Posted by williaty

05 and 06 are pretty much the same. The big change is between 04 and 05.

And 07 is identical to 06 then?

williaty · 09-17-2010, 05:38 PM

Yup45

RaineMan · 09-17-2010, 05:40 PM

Ok... cool. Beginning to get an idea of what I've got under the hood now.

Thanks!

williaty · 09-17-2010, 07:28 PM

Summary:

2002-2004=not much change
2005=big changes compared to 04
2006-2007=tiny changes compared to 05

09-09-2010, 09:39 PM	#1
00LGTP Scooby Newbie Member#: 172618 Join Date: Feb 2008 Chapter/Region: Tri-State Vehicle: 2000 RS BRP	05+ manifold project i am currently in the process of putting a 07 2.5i IM on my 2.5rs. im pretty sure i have everything i need planned out, just need to get parts and physically do it. i have found very little info about people doing this, which is why i wanted to see what info you guys have obtained. any info will be helpful, im open to all suggestions. * Registered users of the site do not see these ads.

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09-11-2010, 01:35 AM	#2
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	The only difficulty is in mounting the throttle since you have a cable throttle and the 05+ IM is for DBW. There's some brackets and things you'll have to have custom fabbed at a machine shop to allow the cable throttle to function.

09-12-2010, 10:33 PM	#3
wmdoucette Scooby Newbie Member#: 192709 Join Date: Oct 2008 Chapter/Region: W. Canada Location: Calgary, AB CANADA Vehicle: 2007 2.5iSE Wagon CG 2001 2.5RS Coupe RBP	and fab some sort of port for the Idle air to flow through. My best idea right now is to hog out the hole in the TB, tap an AN Pipe-flare fitting in and do the same somewhere on the intake manifold.

09-12-2010, 10:34 PM	#4
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	Isn't the entire idle-air apparatus integrated into the throttle body?

09-14-2010, 11:40 PM	#5
00LGTP Scooby Newbie Member#: 172618 Join Date: Feb 2008 Chapter/Region: Tri-State Vehicle: 2000 RS BRP	i compared gaskets and came to the conclusion that my stock RS TB will bolt up, but that stupid IACV passage has to be in the way. i have a TB spacer, so i block it off on the manifold side, drill a hole/install fitting, run a hose from that fitting to the IM plenum. done! cable will be easy, small bracket. the map sensor! im going to port out on of the EGR holes, only need about a 1/8" all the way around, polish it up nice and pray i did a good job and that O ring will seal. i can always use sensor save gasket sealer. bolting it up will be no harder of bolting on another plate to the stock EGR threads and drilling holes with bolts for the map. you guys know it will work! if you guys get a chance, let me know what you think about this for the fuel system. http://www.rs25.com/forums/f13/t1427...-his-hose.html

09-15-2010, 11:39 AM	#6
renob123 Scooby Specialist Member#: 41986 Join Date: Aug 2003 Chapter/Region: NWIC Location: Hillsboro, OR Vehicle: '06 STI/'85 Brat	Nice! Thanks for putting this out there for everyone. Aside from zzyzxx running one in the 300hp NA car, does anyone have any info on the gains that can be achieved by swapping to the newer manifold? Jacob

09-15-2010, 05:39 PM	#9
00LGTP Scooby Newbie Member#: 172618 Join Date: Feb 2008 Chapter/Region: Tri-State Vehicle: 2000 RS BRP	ill post pics and explain how i did things but i cant be bothered by a flowbench. dont get me wrong i would love too, but im a full time college student and (Automotive Technology and Management) i have limited time.

09-16-2010, 08:33 AM	#13
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	Contact 42 Autosports. They've done it and came to the conclusion that the stock intake tract can't provide enough air to make it an all out winner. There are more details, but you should contact them to get the whole story. Jay

09-17-2010, 01:49 PM	#14
00LGTP Scooby Newbie Member#: 172618 Join Date: Feb 2008 Chapter/Region: Tri-State Vehicle: 2000 RS BRP	^^ send them an email, waiting for a reply. does anyone know if stock 2.5i injectors will work with a WRX/STI aftermarket fuel rail? gotta spend a certain amount on a FPR, so might as well do it while i have it apart and do a fuel rail/FPR combo. ebay sells come kits with lines and everything i need. normally i wouldnt mess with ebay stuff but machined aluminum is machined aluminum.

09-17-2010, 04:18 PM	#18
Storm Scooby Guru Member#: 5218 Join Date: Mar 2001 Chapter/Region: MWSOC Location: SAUL'S Motorsports Vehicle: 96L Most Over- Developed Beater	Exactly.....the torquebox made for pre-05 cars has a small inlet and the CAI they developed for those cars ended up not being a good match for that manifold. The torquebox made for that unit was better, but still short of what they had prior to bolting it on. IIRC, the best gains came from a 4" cone filter (from a GTR) taped directly onto the TB. The smaller volume of the 05 torquebox works well enough, but the inlet to it needs opened up substantially to let it work. Jay

09-17-2010, 04:24 PM	#19
RaineMan Scooby Specialist Member#: 256727 Join Date: Sep 2010 Chapter/Region: RMIC Location: SL,UT Vehicle: 2007 2.5I Wagon Silver	So I take it the intake was redesigned for 06+? Just trying to figure out where my car fits in this.

09-17-2010, 05:38 PM	#23
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	Yup45

09-17-2010, 05:40 PM	#24
RaineMan Scooby Specialist Member#: 256727 Join Date: Sep 2010 Chapter/Region: RMIC Location: SL,UT Vehicle: 2007 2.5I Wagon Silver	Ok... cool. Beginning to get an idea of what I've got under the hood now. Thanks!

09-17-2010, 07:28 PM	#25
williaty Scooby Guru Member#: 71092 Join Date: Sep 2004 Chapter/Region: MWSOC Location: Delaware County, Ohio Vehicle: 2005 2.5RS Wagon Regal Blue Pearl	Summary: 2002-2004=not much change 2005=big changes compared to 04 2006-2007=tiny changes compared to 05