|
|
|
|
Thread Tools | Display Modes |
03-01-2013, 11:40 AM | #76 |
Scooby Newbie
Member#: 314973
Join Date: Mar 2012
Chapter/Region:
BAIC
Location: California
Vehicle:2012 Impreza Sport Satin White |
|
03-01-2013, 01:55 PM | #77 |
Scooby Newbie
Member#: 200057
Join Date: Jan 2009
Location: Cottage Grove, MN
Vehicle:2018 Impreza 2.0i 5d RalliSport Blue |
Yeah, I'll update later tonight...
|
03-02-2013, 02:47 PM | #78 |
Scooby Newbie
Member#: 200057
Join Date: Jan 2009
Location: Cottage Grove, MN
Vehicle:2018 Impreza 2.0i 5d RalliSport Blue |
Now that I had a 4-1 header and full catback, I was curious if the factory cat pipe was the bottle neck in the system: (it is less than 2" going into the second cat and then 60mm going out. 60mm is right in between 2.25" and 2.5") So I threw this together:
Don't let that heat shielding fool you, it's like 1.9" piping under there. I replaced it with 2.25" piping and a HFC. As I suspected, it made absolutely no difference below 4,500rpm but then gained RPM 4250, +0 4500, +1 5750, +2 5000, +3 5250, +4 5500, +4 5750, +4 6000, +3 It should also be noted that I added a little tune at the same time, so I'm not sure how much of the tune was responsible for any gains. Then just for fun I took my 4-1 header and hacked off the cat and add a venturi section: The results were no gain in the bottom to mid and like 1hp or so in the upper end, but a god awful increase in loudness and rasp. So I took that header and added back in the cat and modified it into a 4-2-1 header, because i didn't like the low rpm dip in torque the 4-1 made and although it made good power in the top end, it felt too "peaky" when driving. Here's the results of the 4-2-1 Here's the hp gain over stock: RPM 2000, +0 2250, +0 2500, +0 2750, +0 3000, +1 3250, +2 3500, +3 3750, +4 4000, +6 4250, +6 4500, +8 4750, +8 5000, +8 5250, +8 5500, +7 5750, +8 6000, +8 6250, +13 6500, +29 Now there was no loss in the bottom end, peak torque was raised only 200rpm to 4200 and when the stock hp rolled off at 6000, these kept climbing another 200rpm. Again, this was just an experiment, BUT its sill UEL it still has tons of rumble and it still makes power. Last edited by blk6s; 03-04-2013 at 03:02 PM. |
03-11-2013, 08:32 PM | #79 |
Scooby Newbie
Member#: 327676
Join Date: Jul 2012
Chapter/Region:
VIC
Location: Slurry + Ditchmond
Vehicle:2002 Stg 2 WRX Sedan PSM "sold" |
^ I say you hit the jackpot with the 4-2-1 build.
As we all know, it is incredibly difficult to milk even 20+ hp increase out of the 2.0i or previous 2.5i even if we open up airflow AND give it a tune. The fact that you got a steady increase for about +5 hp in normal driving conditions (approx 4k rpm) is already very impressive. I just can't wait to hear the rumble :P you sir, get a cookie |
03-11-2013, 09:56 PM | #80 |
Scooby Newbie
Member#: 320291
Join Date: May 2012
Location: Toronto, Canada
Vehicle:2012 Impreza 4DR 5MT White |
Wonderful! Any projected time frame for a production ready header?
|
03-12-2013, 12:42 PM | #81 |
Scooby Specialist
Member#: 283606
Join Date: May 2011
Chapter/Region:
Tri-State
Location: Red Bank,NJ
Vehicle:2008 Impreza 2.5i Silver |
How do you think to the 4-2-1 for the 2.5l benefit power wise compared to the 2.0l
|
03-16-2013, 07:53 PM | #82 |
Scooby Newbie
Member#: 342279
Join Date: Jan 2013
Location: Pacific NW
Vehicle:2012 Impreza Sport DGM |
First of all, great numbers over the stock setup! My understanding is that performance often comes at some cost to fuel efficiency.. so naturally I'm curious, how much has ur avg mpg been affected from the tune and ur 4-2-1 header installation?
|
03-19-2013, 11:07 PM | #83 | |||
Scooby Newbie
Member#: 200057
Join Date: Jan 2009
Location: Cottage Grove, MN
Vehicle:2018 Impreza 2.0i 5d RalliSport Blue |
Quote:
Quote:
Unfortunately, I'm up to my eye balls in 2.5i uel header orders and am still in the process of developing a few axleback's for the 2.0i, so headers for the 2.0i may need to be put on the back burner. Good news is you can email me and order a "custom" header at any time, that way you can secure a spot on the waiting list (which is now approaching 3 months). A member on this forum has already placed a deposit on the prototype tested in my previous post. Quote:
Hmm, good question. Actually, freeing up the exhaust should theoretically allow a small mpg increase, but the reality is that most people develop the lead foot syndrome after installing a performance part, especially one that creates a sexy rumble! I suffer from said syndrome. Plus, it's winter in MN, so letting the car idle for ten minutes before taking off each time isn't helping the cause. |
|||
03-20-2013, 04:37 PM | #84 | |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
Quote:
|
|
03-24-2013, 07:46 PM | #85 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
This is Part 2 of the exhaust, the 2nd CAT of the system, Just curios blk6s is this the magna flow CAT? Oh, did you ever get a High-Flow Resonator that resembles the OEM one? Any pics of it yet? |
03-29-2013, 06:44 PM | #86 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
The Impreza 2.0i Header OMG!
Droooooling! OMG! Part 1 Done! |
03-30-2013, 02:53 AM | #87 |
Scooby Newbie
Member#: 342279
Join Date: Jan 2013
Location: Pacific NW
Vehicle:2012 Impreza Sport DGM |
Wow.. Could that be the much anticipated 4-2-1 UEL header with the Cerma chrome finish? I haven't found a production model on the Rallisport Racing website, is that one of the prototypes? Looks glorious!
|
03-30-2013, 02:18 PM | #88 | |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
The 2.0i Impreza with some bang!
Quote:
Last edited by ZURCALED12; 03-30-2013 at 02:19 PM. Reason: inserting picture |
|
03-30-2013, 03:52 PM | #89 |
Scooby Newbie
Member#: 320291
Join Date: May 2012
Location: Toronto, Canada
Vehicle:2012 Impreza 4DR 5MT White |
Wow.. that looks really good. Cant wait till you get it installed! Post vids pls once you do!!
|
03-30-2013, 07:15 PM | #90 |
Scooby Specialist
Member#: 317014
Join Date: Apr 2012
Chapter/Region:
Tri-State
Location: NY/CA
Vehicle:2017 Crosstrek ISM |
Yes, pics and video of the full install please...=)
|
03-31-2013, 11:25 AM | #91 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
This the WRX mid-pipe being modified to fit our 2.0i
It's not finished yet and it's not C.K. Coated either, so I will keep you posted. |
03-31-2013, 12:38 PM | #92 |
Scooby Newbie
Member#: 342279
Join Date: Jan 2013
Location: Pacific NW
Vehicle:2012 Impreza Sport DGM |
Nice! All this exhaust pioneering is exciting! What's the difference in pipe diameter from the stock to the WRX mid pipe?
|
03-31-2013, 09:25 PM | #93 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
The stock exhaust is very uneven!
Well, the stock exhaust is very uneven from 1.9" in some areas & up to on 2.5" wide in others. RalliSport Racing recommends a consistence 2.25" from header to muffler. Check out another video of the current exhaust on my Impreza. Not a good job at all!
|
03-31-2013, 11:58 PM | #94 |
Scooby Newbie
Member#: 299287
Join Date: Oct 2011
|
will this possibly fit on an 07 2.5i without throwing a cel
|
04-01-2013, 12:48 AM | #95 |
Scooby Newbie
Member#: 200057
Join Date: Jan 2009
Location: Cottage Grove, MN
Vehicle:2018 Impreza 2.0i 5d RalliSport Blue |
|
04-01-2013, 12:52 AM | #96 |
Scooby Newbie
Member#: 200057
Join Date: Jan 2009
Location: Cottage Grove, MN
Vehicle:2018 Impreza 2.0i 5d RalliSport Blue |
|
04-01-2013, 08:05 PM | #97 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
I suck at making videos with a iPhone 4S, LoL!
|
04-03-2013, 02:51 AM | #98 |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
edit delete
|
04-04-2013, 03:11 PM | #99 |
Scooby Newbie
Member#: 309754
Join Date: Feb 2012
Chapter/Region:
Tri-State
Location: Brewster, NY
Vehicle:2012 Impreza Sport L Ice Silver Metallic |
OEM BOLTS/ SPRINGS/NUTS for Exhaust in Stainless Steel
44044AA010 Springs 44059AA010 Bolts 802008270 Nuts Those are the part numbers for the OEM SUBARU parts for the mid-pipe hardware at the 2nd CAT pipe connection. I am guessing that getting these Cerma Krome Coated should make them last as long as the exhaust too. I have not found anyone that makes these in Stainless Steel. This is the Dorman version of the exhaust kit no. 03114 Last edited by ZURCALED12; 04-04-2013 at 03:22 PM. Reason: Spelling correction |
04-04-2013, 10:52 PM | #100 |
Scooby Newbie
Member#: 230167
Join Date: Nov 2009
Chapter/Region:
MAIC
Location: Libtardistan
Vehicle:2006 2.5i CGM |
Besides losing the boxer rumble, I wonder what gains, in terms of power, we would see if it were a EL header instead of UEL.
Either way, I'm always curious about the progress of your exhaust set-up. Keep posting! |
Thread Tools | |
Display Modes | |
|
|