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Old 05-21-2001, 11:58 AM   #1
Scooby Newbie
Member#: 6576
Join Date: May 2001
Location: McMurray, PA, USA
2001 Impreza 2.5 RST

Post Intake wonder.....

Why cant you just attach a cone filter directly to the throttle body without and intake pipe? Or is there a minimum distance that a pipe has to be?
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Old 05-21-2001, 01:40 PM   #2
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Member#: 1575
Join Date: Jun 2000
Chapter/Region: South East
Location: Atlanta GA, USA
2011 WRX Premium
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You can! That is actually what I am running kinda. I have a huge cone filter with a rubber coupler that funnels it down to TB size in over abut 3.5" The benefits and drawbacks are:

+ Ridiculous sound (could be a minus)
+ Top end from 4000-redline pulls much harder
- Low end under 3000 definately suffers

I think that the size of the cone filter makes a big difference I picked mine because it's internal volume was close to that of the old "torque chamber". Other people I have seen used smaller filters and comlained of too much low end loss.

Note: I just installed a Stromung Cat back 2.25" (dual tip) and got back my low end!
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Old 05-22-2001, 12:17 AM   #3
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Join Date: Apr 2001
Location: Burnaby, BC, Canada
2002 Aspen White


I think your engine will be less responsive, cause I took the stock intake pipe, and left only a little tube sticking out then connects to the filter.

I noticed it right after I took it off, so I think it's better to get a proper intake.
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Old 05-22-2001, 07:41 AM   #4
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Location: Clover, SC
2003 Tiburon
Rally Red

Thumbs down

Kiss your torque goodbye.
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Old 05-22-2001, 07:51 AM   #5
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Join Date: Oct 2000
Location: Charlotte, NC
2003 BMW Z4


you will loose low end torque but gain a lot up top
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Old 05-22-2001, 07:53 AM   #6
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Join Date: Dec 2000
Chapter/Region: MWSOC
Location: De Pere, WI
2007 Scion tC
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ChaosThom, that's not entirely correct. The torque isn't gone, it's just move itself a little farther north on the rpm range.

skidplatez had it right...the engine becomes more peaky. and if that's what yer lookin for, buy a honda.
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Old 05-23-2001, 12:47 AM   #7
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Join Date: Mar 2000

If you do a search about DIY intakes you'll come across a ton of info.

Here is one thing I do remember from my massive amount of research on the matter. Trey Cobb put a cone filter on his Impreza (converted to RWD) and dynoed it...this is with just a cone filter on the throttle body mind you. He saw losses of 30 lb ft of torque down low in the RPM range. There will be some gains above 3K, but is it enough to offset the loses? Mmmmm....I don't think so.

From what I have learned (and I could be wrong...so feel free to add to this...) is that the reason we have that big box holding the airfilter on the stock intake system is serve as an air reserve, a plenum, so when you hit the throttle there is a mass of air sitting ready to flow into the engine. That promotes low end torque. So one school of thought has been to build a box around the cone filter on the throttle body...and then you can even use the hoodscoop as a source of air!

But...there is another problem with that. That will help by giving you a plenum, but without some length to the intake itself, the air entering the engine will not have a lot of velocity. Air speed velocity is another promoter of power.

However!! There are ways to work around all of that...I feel. This has been an on going project of mine for MONTHS now...and we have a new carbon fiber prototype cold air hood scoop intake filter deal in the works. Stay tuned...

D. Neil Crawford
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Old 05-23-2001, 12:57 AM   #8

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Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
16 WRX (white)
04 FXT (red)


Boink - http://8complex.mwsoc.org/intake.html

No perceptable torque loss, but lots of top end gain, as well as pulling away from most other scoobs with intakes, etc by about 80.

Yes, I need to take new pics. No, I won't be running this much longer... going to install an oversize hardryer soon. No, it's not bad in rain, unless the rain is really REALLY heavy (and then I just stuff a towel in the scoop until it calms down).
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