|
|
|
|
Thread Tools | Display Modes |
12-08-2008, 10:54 PM | #1 |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
I made a separate thread after reading pretty much every post containing the words "hybrid", "intake", "SRI", and "CAI". I noticed that in 2008 the airbox changed slightly from previous years. The MAF is now integrated into the airbox housing and the accordion pipe from the MAF to the torque box is shaped differently. These things led me to believe that the 2008 may be a little different. Hence, new thread...
First: I purchased an ebay intake with the intent of hacking it up like so many others. I made two cuts on the pipe. One before the 45 Deg bend going to the MAF and the other near the apex of the pipe. Not hot, I needed a 3" coupler that was 3" long and 4" pipe drain coupler (home depot style) at the airbox to make it work. I was not thrilled. It barely fit and seemed way too tight. I then decided to comb the internets to see what I could find from the Legacy guys. Found that they were more often running a different style of ebay intake which can no longer be found. See it here: I am not okay with this, all the pictures from the Legacy forum make this intake look like it fits without hacking. So once again I head to the intertubes . I come up with this: Intake Bingo! Good price no less with free shipping. 1998-2001 Subaru Impreza - Kool Vue Cold Air Intake P/N KV4801073K I recieve it, take everything apart (again) and see whats up. Well, it almost fits perfectly. It just needs to be stretched towards the front of the car slightly. Can do. One hack and done, its probably extended no more than 1". Oh, and, this intake comes with all the extra hose you need. You can see it here: What else do I need to complete the job? Auto Parts Store: 2 x 3" silicone coupler. One for the hack, one for the airbox. 8 x Hose clamps 1 x 3/8" vacuum cap for that stupid grommet (why are you there?!?) Home Depot: 3 x 1/2" - 1/2" brass hose barbs to add some inches to the breather lines. 1 x Hacksaw (to cut the pipe) 1 x Knife (to cut the hose) 1 x Socket set 1 x Screwdriver set Liquor Store: 6 x Beer of choice for a job well done Process:
* Registered users of the site do not see these ads.
Last edited by cthomasset; 04-06-2009 at 04:05 PM. |
12-08-2008, 11:41 PM | #2 |
Scooby Newbie
Member#: 194990
Join Date: Nov 2008
Location: Eugene OR
Vehicle:2008 OBS Steel Silver/Spark Silver |
Nice writeup. Do you feel any difference? Has it been on long enough to get any measure of fuel economy at all? Us nonturbos have pretty limited options for intakes, so its cool that you figured all this out!
|
12-09-2008, 12:49 AM | #3 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
Nice work. looks clean and sound. Do you have the necessary equipment to do some ECU logging?
|
12-09-2008, 01:45 PM | #4 | |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Quote:
There was a dyno up on the forum somewhere that I saw, showed some good gains if I remember right. As far as economy goes, I have not had it on there very long. Time will tell, and I should have some numbers over the next few weeks when I get back to a normal commuting schedule. |
|
12-09-2008, 02:45 PM | #5 |
Scooby Newbie
Member#: 163066
Join Date: Oct 2007
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:08 2.5i sedan DGM |
the picture of the intake kit you settled on is missing... link??
|
12-09-2008, 06:52 PM | #6 |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Last edited by cthomasset; 12-09-2008 at 07:22 PM. |
12-09-2008, 07:08 PM | #7 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
have you any way to rescale the MAFv table? I would highly suggest you do this for reliability sake.
|
12-09-2008, 07:30 PM | #8 | |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Quote:
I have a dashhawk (http://www.dashhawk.com/)...I think it will log ECU parameters. Last time I used it was for boost pressure on my last car. What to you mean by MAFv rescale exactly? I thought we only ran into MAF issues on the NA engine when using a cone air filter... |
|
12-09-2008, 07:38 PM | #9 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
its rescaling the MAFv table to be better calibrated for the new intake.
MAF issues have been found on the subaru N/A MAF based engines. The problem has been proven to exist on 05-07's and id bet that the 08 would also have the same problem. BUT, the hybrid intake you have takes care of the MAFv spikes, but does not retain the stock MAFv scaling as being ideal. So a MAFV table rescale is necessary to ensure that your AFR's are what they should be and that the ECU isnt adjusting fuel learning by huge amounts just to try and get it close to target. |
12-09-2008, 07:49 PM | #10 | |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Quote:
However, I do have a dashhawk that could monitor this stuff. Assuming what I have will work, what should I monitor? Calculated load? AFR? MAF values? I am more of a hardware than software guy, so I am a bit lost in this arena. |
|
12-09-2008, 10:09 PM | #11 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
There is a thread on here that Williaty posted a technique for scaling the MAFv table. Which you could do with the dashhawk, but unless you can actually modify/change the table values (edit the ECU image) then its not going to do you much good. you could find out how far off it is though. Check your A/F learning. i think A/F learning D is the long term learning trend (dont quote me on that) and you want it to be as close to 0 as possible. Mine is rarely over 1% and i have never seen it over 2% since i rescaled. anything over 4-5% is too much in my opinion. If your A/F learning parameters are all whacked out then its safe to say that you need to rescale your MAFv table.
|
12-10-2008, 04:33 PM | #12 |
Scooby Newbie
Member#: 163066
Join Date: Oct 2007
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:08 2.5i sedan DGM |
i still dont see a link...
|
12-10-2008, 06:01 PM | #13 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
cthomasset - do you have a laptop? and $65 or so? you could solve this problem and many others that may arise, just to scratch the surface.
|
12-10-2008, 06:27 PM | #14 |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
|
12-10-2008, 06:41 PM | #15 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
k, well if you are thinking about it and have the time, start doing some reading over @ www.romrraider.com keep in mind a huge majority of the users are drivers of forced induction vehicles. But the software works the same no matter what. and its much simpler to tune an N/A motor in my opinion. fewer variables and less dynamic in terms of changes going on with the engine.
|
12-10-2008, 07:18 PM | #16 |
Scooby Newbie
Member#: 163066
Join Date: Oct 2007
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:08 2.5i sedan DGM |
cthomasset need the link to carry out your beautiful write up!
raceface as a side, doesnt a tactrix cable cost like $180 or something? plus if you want A/F sensor/reader thats another $200... |
12-10-2008, 08:07 PM | #17 | |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
Quote:
I didnt find any WBO2's with a gauge for less than $300, so i dont know what the cost would be exactly. depends on how the user wants to use it. With a computer or without? the gauge is what costs the most it seems. |
|
12-10-2008, 08:25 PM | #18 |
Scooby Newbie
Member#: 163066
Join Date: Oct 2007
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:08 2.5i sedan DGM |
actually just found out theyre making a 2005+ 2.5i Cobb Accessport! comign out in February. im stoked.
|
12-10-2008, 08:35 PM | #19 | |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Quote:
http://www.autopartswarehouse.com/details/QQSubaruQQImprezaQQKool_VueQQCold_Air_IntakeQQ1998 2001QQKV4801073K.html Its at the top of the post after the first picture. Last edited by cthomasset; 12-10-2008 at 09:26 PM. |
|
12-10-2008, 09:02 PM | #20 |
Scooby Newbie
Member#: 163066
Join Date: Oct 2007
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:08 2.5i sedan DGM |
i seriously cant see it... i tabbed through the page for all links and nothing came up in your first post... please jsut post it again id really appreciate it
|
12-10-2008, 09:24 PM | #21 | |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
Quote:
www.autopartswarehouse.com autopartswarehouse.com Search for 1998-2001 Subaru Impreza - Kool Vue Cold Air Intake P/N KV4801073K That should probably be in the first post anyway. Last edited by cthomasset; 12-10-2008 at 09:32 PM. |
|
12-10-2008, 09:35 PM | #22 |
Scooby Specialist
Member#: 172036
Join Date: Feb 2008
Chapter/Region:
Tri-State
Location: NNJ
Vehicle:2010 2.5i Prem SSM |
nevermind
Last edited by AfflxnPB; 12-19-2008 at 12:49 PM. |
12-10-2008, 10:43 PM | #23 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
|
I forgot/went blank and didnt acknowledge that you have an 08, so the tactrix openport 2.0 cable is currently $169. for some reason i kept thinking you have an 06.
Openport 2.0 data cable I dont think the less expensive openport 1.3 data cable will work for an 08+ |
12-10-2008, 10:49 PM | #24 |
Scooby Newbie
Member#: 183763
Join Date: Jul 2008
Chapter/Region:
Tri-State
Location: Emmaus(Allentown),PA
Vehicle:2009 WRX SSM |
Nice write up, but do you feel that it was worth the money?
|
12-10-2008, 11:19 PM | #25 |
Scooby Newbie
Member#: 189435
Join Date: Sep 2008
Location: Kansas!
Vehicle:2008 2.5i Silver |
After buying two intakes and some misc parts for the project, I still spent approximately $140 (including beer). Forget the ebay intake and go with this one I have linked. Total spent will be around $100. Maybe less depending on how many hose clamps, vacuum caps or brass barbs you already have.
In terms of performance gain per dollar, I don't know of a single mod for the 2.5i that comes close to this...maybe rear sway bar, but thats another category. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Cold Air Intake on 2008 2.5i | AlexU | Newbies & FAQs | 12 | 04-22-2012 12:48 PM |
Hybrid intakes for the 2.5i '08+ | Rotten Tomato | Normally Aspirated Powertrain | 2 | 03-10-2010 09:57 PM |
87 octane ECONO / STG1 maps and agressive throttle mapping for 2008 2.5i. | Rallitek.com | Normally Aspirated Powertrain | 0 | 09-15-2009 02:47 PM |
Floor LED usable for 2008 2.5i???? | jbd0419 | Interior & Exterior Modification | 4 | 02-22-2009 10:14 PM |
Maintenance Interval Question for 2008 2.5i | c-four | Impreza Forum | 5 | 07-11-2008 09:54 PM |