Welcome to the North American Subaru Impreza Owners Club Sunday July 13, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-20-2005, 07:41 PM   #51
Kevin Thomas
Street Racing Instructor
Moderator
 
Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

Default

Quote:
Originally Posted by SIL01
Just curious, Kevin, what type of gains did you see with your Minnam?
8 months later, I figured I'd answer this question. I hate leaving things unanswered. I just never read it. Ran into this searching for dyno graphs. Well, here it goes.




* Registered users of the site do not see these ads.
Kevin Thomas is offline   Reply With Quote
Old 10-20-2005, 07:45 PM   #52
ShortysTRM
Scooby Newbie
 
Member#: 78108
Join Date: Dec 2004
Location: Teays Valley, WV
Default

Good lord, the change in your power delivery alone would make it worth it...
ShortysTRM is offline   Reply With Quote
Old 10-20-2005, 08:59 PM   #53
t3hWIT
Scooby Guru
 
Member#: 58779
Join Date: Apr 2004
Chapter/Region: MAIC
Location: **** Town
Vehicle:
95 STi RA (rhd)
98 Tacoma (300k Club)

Default

hey Kevin. prolly purchasing a used Weapon R intake and putting the ebay one to pasture (well, keeping it for sentimental reasons and such) cuz it has that bung for the idle air control valve hose, the one causing me all those problems. not that youd want to shell out the money for that (ebay was one thing, this one wouldnt be a biggy) but if you are for some reason going to a dyno anytime soon i can ship that to yah for shizs and giggles
t3hWIT is offline   Reply With Quote
Old 10-20-2005, 11:01 PM   #54
Rally_wgn
Scooby Specialist
 
Member#: 62629
Join Date: May 2004
Chapter/Region: MAIC
Location: Richmond,VA
Vehicle:
1996 OBS in Green
2.5 N/A w/ full exhaust

Default

I have a noobish question. How can you tell if your car is running rich or not? especially at specific RPM's.

My car was purchased with a secret weapon intake and the power has always seemed good on the low end (similar to the power delivery illustrated in the dyno results).
Rally_wgn is offline   Reply With Quote
Old 10-21-2005, 08:19 AM   #55
Gil
Scooby Specialist
 
Member#: 20872
Join Date: Jul 2002
Chapter/Region: Tri-State
Location: Rochester, NY
Vehicle:
t3h rubber-neckers
must die!

Default

wow. i figured it might make some diff, but didn't expect it to be that much.

now it's official. best $20 i've ever spent on my car.
Gil is offline   Reply With Quote
Old 10-21-2005, 06:38 PM   #56
Yoda
Scooby Newbie
 
Member#: 60418
Join Date: Apr 2004
Location: The Force (Induction)
Default

delete
Yoda is offline   Reply With Quote
Old 10-21-2005, 07:57 PM   #57
t3hWIT
Scooby Guru
 
Member#: 58779
Join Date: Apr 2004
Chapter/Region: MAIC
Location: **** Town
Vehicle:
95 STi RA (rhd)
98 Tacoma (300k Club)

Default

Quote:
Originally Posted by Yoda
delete
speak and be heard
t3hWIT is offline   Reply With Quote
Old 10-22-2005, 01:37 AM   #58
burnera
Scooby Newbie
 
Member#: 56232
Join Date: Feb 2004
Chapter/Region: RMIC
Location: omaha
Vehicle:
89 325I
i don't know

Default

so who are the good sellers for this ebay intake?
burnera is online now   Reply With Quote
Old 11-04-2005, 01:50 PM   #59
Kaymin
Scooby Specialist
 
Member#: 96076
Join Date: Sep 2005
Chapter/Region: NWIC
Location: 253
Vehicle:
RIP 96 SBM GC8
05 Burnt Orange Evo

Default

yea, i would like to know this also since i am getting my 2.5rs soon, hopefully
Kaymin is offline   Reply With Quote
Old 11-04-2005, 02:23 PM   #60
t3hWIT
Scooby Guru
 
Member#: 58779
Join Date: Apr 2004
Chapter/Region: MAIC
Location: **** Town
Vehicle:
95 STi RA (rhd)
98 Tacoma (300k Club)

Default

I have the original Ebay intake Kevin tested, but its not listed anymore. It also didnt fit correctly, required some modding to make it fit (cutting, turning, and moving a section of the intake)

this looks like a corrected version (that fits) intake, including the hardware and same filter (bad filter, I would definatly not reccommend using it, i had dust in my intake from it)
http://cgi.ebay.com/ebaymotors/95-01...QQcmdZViewItem

try to find one with a 3/4 bung welded onto it though for the idle air control valve. bogging and stalling could (in my case, did) result if not...
t3hWIT is offline   Reply With Quote
Old 11-04-2005, 03:33 PM   #61
gc822
*** Banned ***
 
Member#: 81217
Join Date: Feb 2005
Chapter/Region: Tri-State
Default

wow.... long live the ebay intakes..... I'm putting mine back on!!

AH! HA!

-MAc
gc822 is offline   Reply With Quote
Old 11-04-2005, 04:53 PM   #62
Kaymin
Scooby Specialist
 
Member#: 96076
Join Date: Sep 2005
Chapter/Region: NWIC
Location: 253
Vehicle:
RIP 96 SBM GC8
05 Burnt Orange Evo

Default

I was looking at this intake since atleast the filter is reliable

http://cgi.ebay.com/ebaymotors/97-01...spagenameZWDVW
Kaymin is offline   Reply With Quote
Old 11-08-2005, 03:36 AM   #63
Chi_San
Scooby Guru
 
Member#: 53558
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Deadford, OR
Vehicle:
2002 WRX Wagon
Silver

Default

Quote:
Originally Posted by Kevin Thomas
I honestly can't answer this directly. Despite what you may read about your car not learning at WOT, it does. Every run I did with an aftermarket intake, the air/fuel ratio got richer and richer. Even after disconnecting the ECU after I did two runs and reconnecting it to do another two runs with the same intake. It seemed the ECU took up where it left off before and continued to make the car run richer, in all gears.

Also, different Subaru ECUs work differently. I noticed through dyno testing that an Impreza ECU the same year as mine just made a little later runs leaner. It's as if the ECU mapping is different. While my ECU keeps adjusting richer and richer until above 5000rpm, the air/fuel ratio can drop as low as 10.0:1, the one made later on the same year as mine won't go below 12.5:1. I haven't gone about trying to figure it out. I just understand that this is the way it works.

In short, I'm trying to say that different intakes are going to work differently on different cars (even of the same make/model and year). Even your modifications will determine how rich/lean it's going to run. Each one will be a case by case test. I know my car just dumps a load of fuel above 5000rpm on everything except for the stock setup after it gets used to an aftermarket intake.
I think it's because after 5,500 rpm or 5,250 rpm, the ECU ignores the knock sensor, MAP/MAF, and O2, and runs on a preset map. This may very from car to car, but I do know that at least the knock sensor is ignored over 5,000 rpm.

I used 3" ID PVC pipe for a homebrew intake. I added some spiral shaped foam (superglued in) for noise reduction and to improve the flow through the bends. At 5,000 rpm, the intake would get obnoxiously loud right ot redline. Hard shifting at redline resulted in a massve backfire out the intake, which was often loud enough to deafen everyone in sight. It would backfire during a hard shift anywhere above 5,5,00 rpm, but it would be amazingly loud right at the rev limiter. I'm thinking that it was backfiring because it was running so lean, it wasn't able to detonate on time, and during the sudden slam shift, it would almost blow up my intake every time.
Chi_San is offline   Reply With Quote
Old 11-08-2005, 04:19 AM   #64
Kincaid Racing
Scooby Newbie
 
Member#: 82249
Join Date: Mar 2005
Chapter/Region: NWIC
Location: My racing seat
Vehicle:
MY99 Impreza V-6
Java Black Pearl

Impreza GC8

Go with the Ebay tube you can modify it to work if it dosen't fit for some strange reason. I made it work on my 99 RS & still retained the stock MAF sensor location definatly the best $11 dollars plus $25 shipping ever spent and my Denim dyno says so too!
Kincaid Racing is offline   Reply With Quote
Old 11-09-2005, 07:51 PM   #65
JoshP
Scooby Specialist
 
Member#: 94350
Join Date: Aug 2005
Chapter/Region: NESIC
Location: S. Maine
Default

what do you guys think about using a MAF cone filter adapter with a stock Legacy tube. Would that be just as good as the ebay intake, or is the power increase from the metal intake?
like this:


Last edited by JoshP; 11-09-2005 at 08:13 PM.
JoshP is offline   Reply With Quote
Old 11-10-2005, 12:15 AM   #66
kaisersouse
Scooby Specialist
 
Member#: 85900
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2001 Forester S
White

Default

Disclaimer: Here comes the noob.

Isnt there some kind of wrapping you can get that shields against high heat? does cold air get heated at all by the temp of the intake pipe itself as it is (no shielding)?

EDIT -IF- by some chance wrapping it does something...who cares what it looks like.
kaisersouse is offline   Reply With Quote
Old 11-10-2005, 02:41 AM   #67
Chi_San
Scooby Guru
 
Member#: 53558
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Deadford, OR
Vehicle:
2002 WRX Wagon
Silver

Default

Quote:
Originally Posted by kaisersouse
Disclaimer: Here comes the noob.

Isnt there some kind of wrapping you can get that shields against high heat? does cold air get heated at all by the temp of the intake pipe itself as it is (no shielding)?

EDIT -IF- by some chance wrapping it does something...who cares what it looks like.
I used heatwrap on my PVC intake. Insulation is thick, and doesn't stick to itself sometimes, which makes it a PITA to use. Also, it does heat-soak after a while, unfortunatly.

So, after a while, the inside of the tube or pipe gets so hot, that the heat shield is just holding excess heat in the tube. If you have a CAI coming from the fender well, that may be different.
Chi_San is offline   Reply With Quote
Old 11-10-2005, 03:28 AM   #68
kaisersouse
Scooby Specialist
 
Member#: 85900
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2001 Forester S
White

Default

Quote:
Originally Posted by Chi_San
I used heatwrap on my PVC intake. Insulation is thick, and doesn't stick to itself sometimes, which makes it a PITA to use. Also, it does heat-soak after a while, unfortunatly.

So, after a while, the inside of the tube or pipe gets so hot, that the heat shield is just holding excess heat in the tube. If you have a CAI coming from the fender well, that may be different.
ah ok. well im going to try and get a small "L"-ish shaped tube and put the filter right smack behind the open hoodscoop. I need to figure out what to do abour rain tho. I was just wondering if wrapping what i have now
kaisersouse is offline   Reply With Quote
Old 11-10-2005, 08:11 PM   #69
Chi_San
Scooby Guru
 
Member#: 53558
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Deadford, OR
Vehicle:
2002 WRX Wagon
Silver

Default

Quote:
Originally Posted by kaisersouse
ah ok. well im going to try and get a small "L"-ish shaped tube and put the filter right smack behind the open hoodscoop. I need to figure out what to do abour rain tho. I was just wondering if wrapping what i have now
It might help you more than it would hlep me. I just did a short ram, sucking in hot engine bay air.

I think I'll do a more elaborate intake mod sometime soon. My engine bay gets dirty, and I don't want to have too much hassle with air filters or problems with dirt getting sucked in my engine. =\ Actually, a snorkle would probably be my best bed for clean engine air...
Chi_San is offline   Reply With Quote
Old 11-10-2005, 09:33 PM   #70
Kevin Thomas
Street Racing Instructor
Moderator
 
Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

Default

**I like the Legacy intake** What is the part# for that intake? What year/model Legacy is it from?

On another note, you will always here the arguments about the short ram vs cold air intakes. I have a 'short ram' or hot-air intake on my XT6. Yes, it does affect off-idle throttle response during the summer months. The car seems a bit slower. My engine bay gets HOT. Even still, driving down the street, performance does not suffer. Going from stock intake to stock snorkus routed to the foglight netted a 3mph in the 1/4 mile. 78mph to 81mph. When I switched to my hot-air 3" intake, the car gained another 1-2mph. I ran high 82 to low 83mph in the 1/4 mile. My hot-air intake even ran a faster trap speed than removing my air filter from my stock intake and having the air 'rammed' into the foglight, directly into the intake. I had my intake tubing sticking part way out my foglight (ghetto but good for experiment). You could tell it was affective because my air-fuel ratio gauge read leaner (.71-.75 vs .82-.85, Jumptronix air-fuel ratio meter) the faster I went. On the highway, it would read dangerously lean the faster I went.

So yes, it does help in some cases. I understand the logic with the cold air and all but sometimes, simply testing something goes a long way. I tested my hot-air intake and it is staying on my car due to how it worked in application, not theory. If you have the opportunity, test these things out.
Kevin Thomas is offline   Reply With Quote
Old 11-11-2005, 02:50 AM   #71
joltdudeuc
Scooby Specialist
 
Member#: 6119
Join Date: Apr 2001
Chapter/Region: BAIC
Location: Union City, CA
Vehicle:
1999 GM6
RBP

Default

Here is a nice looking one. I'm not gonna try it, but if anyone was interested.

http://cgi.ebay.com/ebaymotors/COLD-...ayphotohosting

-Gagan
joltdudeuc is offline   Reply With Quote
Old 12-27-2005, 02:05 PM   #72
scooby_snacks_imprez
Scooby Newbie
 
Member#: 103702
Join Date: Dec 2005
Chapter/Region: South East
Location: Atlanta
Vehicle:
2011 WRX
White

Default

Just to tell the rest of you on Gagan's progress, he has had some fantastic results with that ebay intake also. Turns out its a complete OBX rip off.
scooby_snacks_imprez is offline   Reply With Quote
Old 12-27-2005, 02:24 PM   #73
kaisersouse
Scooby Specialist
 
Member#: 85900
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2001 Forester S
White

Default

Quote:
Originally Posted by scooby_snacks_imprez
Just to tell the rest of you on Gagan's progress, he has had some fantastic results with that ebay intake also. Turns out its a complete OBX rip off.
which is ironic, since last i heard OBX has been screamed at for ripping off other people's "designs".
kaisersouse is offline   Reply With Quote
Old 12-27-2005, 02:28 PM   #74
scooby_snacks_imprez
Scooby Newbie
 
Member#: 103702
Join Date: Dec 2005
Chapter/Region: South East
Location: Atlanta
Vehicle:
2011 WRX
White

Default

Yep, it's apparently very similar to the Injen intake, which aint no bad thing.
scooby_snacks_imprez is offline   Reply With Quote
Old 12-27-2005, 07:46 PM   #75
Plays_With_toys
Scooby Specialist
 
Member#: 82556
Join Date: Mar 2005
Location: Parker, Colorado
Vehicle:
1996 Legacy L wagon

Default

Quote:
Originally Posted by tzedek
what do you guys think about using a MAF cone filter adapter with a stock Legacy tube. Would that be just as good as the ebay intake, or is the power increase from the metal intake?
like this:


Don't. Just don't. Well. You can, but you'd see more gains from the ebay intake. My legacy got a snorkus (lost torque, gained sound), then I swapped on the ebay intake to my stock box with snorkus, and tons of torque returned.

The inner diameter of the legacy pipe is 2.25-2.5" I think? The ebay intake is an iinner diameter of 3". Not to mention the bends are very abrupt and the accordian ruffles disrupt air flow.

By the way, I have a sound clip of my setup in the CAI/Exhaust thread. I think I'm the last post.
Plays_With_toys is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My first road dyno - stock intake vs hybrid intake aurtini Normally Aspirated Powertrain 21 05-09-2009 01:07 AM
OBX header vs. MRT header dyno results Patrick Olsen Normally Aspirated Powertrain 7 06-26-2006 08:31 AM
Ebay vs Stock Intake Dyno Soon Teaser Kevin Thomas Normally Aspirated Powertrain 8 01-27-2005 07:42 PM
Completely stock dyno VS turboback + uppipe dyno RESULTS! billmidd08 Factory 2.0L Turbo Powertrain 25 12-10-2003 12:01 AM
AWD vs RWD/FWD dyno results...how similar? Reciprocity Normally Aspirated Powertrain 2 12-13-2000 05:31 PM


All times are GMT -4. The time now is 02:47 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.