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Old 11-05-2001, 10:25 PM   #1
DDMan
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Join Date: Oct 2001
Location: Rocklin, California
Vehicle:
2002 2.5 RS
Black as Midnight!!!

Default Intake Question...

Ok, so Iv seen a few intakes, but have a quastion...

ASIDE from cold air, what is so benificial about keeping the stock air box and filter with a gansflow (one choice) versus a cone filter that goes RIGHT before the throttle body.

Wouldnt the cone filter provide better throttle responce and low end torque due to the fact that there is NO intake piping, therefore no restriction and immediate air.

Just a question of physics...as my last car had a terrible intake cuz it was over 7' long stretched out.
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Old 11-05-2001, 10:32 PM   #2
tmat3
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Problem with a cone filter is that it sucks hot air because it has to sit close to the engine. If it didn't, it will give you more high-end power.
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Old 11-05-2001, 10:40 PM   #3
DDMan
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I said DISREGAURDING cold air

I mean, I KNOW cold air is a major factor....but Im talking that if the temps entering the throttle body were identical...which intake would be better?

the cone on the throttle body or the gansflow with the stock filter box
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Old 11-05-2001, 10:59 PM   #4
tmat3
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Oops, didn't read the thread carefully.

Anyway, the stock airbox acts as a air reservoir and it does help keeping the low-end torque when new intake is installed. I was always told that I needed to trade one power to get another. If I want to increase low-end torque, I have to somehow sacrifice high-end power. Just like the exhaust, if you speed up the air movement in the car, you'll increase the efficiency and high-end power, but lose some low-end torque.

To summarize, if you use the cone filter, you probably end up losing some low-end torque while increasing the high-end power.
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Old 11-06-2001, 02:24 AM   #5
ImprezaRS dot com
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The cone filter on the TB does lose quite a bit of low end power. Even the cone filter at the end of a long tube has that problem.

I have had several people who switched from a Weapon-R or JC Sports "tube style" intake for a GanzFlow and been very happy with the upgrade to a GanzFlow.

Larry Ganz
www.SubaruPlanet.com
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Old 11-06-2001, 10:31 AM   #6
Richard L.
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Here is a quote taken directly from Cobb's website:

Quote:
Mounted directly behind the throttle body is the mysterious black plastic plenum whose function has been the subject of much debate. This box was completely empty inside, serving only as a chamber, until mid-1999 when Subaru included a secondary air filter inside. While we haven't discussed the details of this design with the engineers at Subaru, we can make some assumptions as to the reasons of this layout based on some theories behind intake systems. One of the primary reasons for this chamber is to act as a supplemental intake plenum to improve throttle response. When you go from low throttle to wide open throttle, the engine's demand for air increases drastically and the stock intake manifold with it's small plenum lacks the necessary volume to satisfy the engine's demands. To remedy this, Subaru uses this secondary air box as a supplemental plenum to supply this sudden demand of air. This gives us the throttle response we want and keeps our engine happy.
--
Richard
http://www.whitetyphoon.com/impreza/
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