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Old 10-18-2001, 12:33 AM   #1
DoodieHead
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Lightbulb COBB Intake vs. Weapon-R Intake

Anyone out there with a COBB Intake or Weapon-R Intake give me some feed back on this one. Right now I have the Weapon-R Intake and I really think that it is killing my HP, due to the fact that it sucks air directly from the engine compartment, but am not really sure. I pretty sure I read somewhere that the Weapon-R is suppose to add 6 to 8HP. I have been looking around to find figures for the COBB intake, but have been unsuccessful In my opinion, I think that the COBB Intake would be at least 12HP if not more, since it sucks directly from the fender well, but that is just a guess. What I need to know is the COBB Intake worth a go-round?? I really want to get rid of the Weapon-R. Anyone out there knowledgable about either of the intakes it would be very much appriciated.
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Old 10-18-2001, 01:06 AM   #2
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I read somewhere that the Weapon-R is suppose to add 6 to 8HP...COBB Intake would be at least 12HP if not more
um... dude... sorry to burst your bubble.... but NO intake alone can account for a 6-12 hp increase in any car...

anyhow..... there is an hp advantage to a cold air intake (CAI).... but disadvantages include getting water in your engine..(bad)

you can also try to fabricate a heat sheild in your engine bay.... i'm not sure, but some places may also sell these heat sheilds...

another option would be to buy CAI extensions for your existing intake.... i know they make these for the honda crowd... but you may need to see if a local shop can fabricate if for you... another cheaper option than a new Cobb CAI

OR.... some people buy some large diameter hose(at home depot) and make a duct from a front source so it feeds cold air to the intake...

i would suggest that since you already have a high flowing intake, don't buy a new CAI.... buy a heat shield and save the money for some other mods..

*sigh* 12 hp from an intake....
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Old 10-18-2001, 02:16 AM   #3
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The Cobb Intake is the best performing intake right now for the 2.5l, the Weapon-R is one of the worst...

Yes, it is worth it IMO
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Old 10-18-2001, 02:40 AM   #4
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I had a weapon-r....now it is an interesting conversation piece in the living room.......POS.....to thin foam...Cobb is the best as far as CAI...it uses a PRM filter and suck air from the fender. My solution was save $269.00, dont buy the Cobb....talk to speedybrent, bought a heat shielded cloth filter (k&n style) for $25 and mount it on the throttle body, under the hood scoop....then you have money left over for other "stuff"

Andres
My car is LOUD
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Old 10-18-2001, 04:33 AM   #5
Keiho
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There is no comparison. I'm sure the Cobb will outperform the Weapon R in each and every way.

That said, I am happy with my Technik intake.
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Old 10-18-2001, 04:59 AM   #6
s
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I'm just wondering, are both of the dim the same? Coz I'm having trouble seeing two similar bent tube will have any different. Or is it the filter that is the critical part? Or the fender matter?
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Old 10-18-2001, 05:12 AM   #7
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Default 8-12HP not possible?? I think not.

LttLDGN:

Here is a dyno from compass motorsports that shows close to 14HP from JUST an intake. The COBB design is very similar to this one, so I am assuming it is in the same ballpark.

"Our design really works, and works well. The baseline run showed a peak Horsepower of 170.8HP @ 5500rpm and a peak Torque of 183.4ft/lbs @ 3750rpm. The second run showed a very nice improvement in both horsepower and torque, with peak horsepower up to 185.4HP @ 5500rpm and peak torque up to 196.3ft/lbs @ 3750rpm. Total gains were tallied at 14.6HP and 12.9ft/lbs of torque."
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Old 10-18-2001, 05:14 AM   #8
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Default After Intake Install

Looks like it gained quite a bit to me
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Old 10-18-2001, 06:18 AM   #9
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I STAND CORRECTED~!!



sorry about that...but if they dyno'ed it...=T beats me...
so....maybe 15 hp for a modified RS... BUT... remember that that is most likely a turbocharged engine or highly modified engine in that car..... base WRX's make around 180 hp to the wheels while 2.5 RS makes less than 100~!!

maybe in conjunction with an exahust, headers, etc... the intake can make 15 hp.... =)
i just remember too many kiddes thinking..."intake gives me 5hp... exhaust is 15....... headers 8....add it up....28 more hp~!!(WRONG!!!!)"

a well tuned airflow system can do wonders....but only under certain circumstances...
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Old 10-18-2001, 07:51 AM   #10
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here is how it was tested....and not heavily modified at all
Quote:
The baseline run was completed using the stock air filter box minus the tubing that runs from the fender to the box. Instead we had an elbow attached to the inlet of the filter box. The only other modifications to the car are a MagnaFlow muffler and Denso Iridium spark plugs. Then for the second run we disconnected that filter box and connected our intake system.
this taken directly from their web-page
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Old 10-18-2001, 07:52 AM   #11
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so in other words, the only thing different between the two charts on the car was the intake
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Old 10-18-2001, 01:09 PM   #12
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Intakes on the ej25 tend to make great power. The Ganzflow dynoed for 9 hp I think, the AEM for 10, 14.6 for the compass, 14-15 for the jc sports and minam intakes. Exhausts on the RS however arent as worthwhile. the best cat-back was 6hp gain. (and the total for an intake and exhaust combo was 18-19hp!) The Ej series reacts very differently than more common inline engines.
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Old 10-18-2001, 01:20 PM   #13
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Doodie,

Talk to larry ganz. He has the parts to change your weapon r to a CAI with the PRM filter. This will essentially make it a Cobb CAI, without having to shell out another $269. And yes, weapon r=pos, Cobb (prm filter)=very nice sound and best of all performance(looks neat too!).

Rob
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Old 10-18-2001, 01:59 PM   #14
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Default Hmm

I don't want to sound like a pessimist, but I have a tough time believing any intake will produce 15 extra HP...even if its in "writing" on an "Internet Site".
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Old 10-18-2001, 02:10 PM   #15
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Viv. then believe the article in Sports Compact Car. At least its print. Otherwise you'll have to goto the dyno yourself to get "believable" numbers.
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Old 10-18-2001, 02:58 PM   #16
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If those tests were performed on a STOCK car.... the car would be an WRX...which falls under my "TURBOCHARGED CAR"
any forced induction car would benefit more from intake/exhaust mods than N/A simply because it makes it easier to force more air in....
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Old 10-18-2001, 03:12 PM   #17
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Actually, Turbo cars do not seem to benefit as much from intakes. The turbo plays the role of air induction...
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Old 10-18-2001, 04:40 PM   #18
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Midwayman,

I'd be happy to check out the article--do you know what date it was and where I could find it.

Like I said, I don't like sounding negative, but I have a tough time reading statements that are sourced to "this website" I know.

see what I mean?

-Viv
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Old 10-18-2001, 06:01 PM   #19
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I have an '02 RS that was completely stock until I installed my COBB CAI. I did G-tech runs before and after and I dropped about 0.43 sec off my 0-60 time. I used the same stretch of road and did a number of runs that I averaged. The weather conditions were identical and the weight of the car was the same. Full tank of gas, me and my sub box. Using some simple math that adds up to about 9.5HP increase in order to improve my time. There are some other variable that might affect this slightly but I think its pretty accurate. The same car on the same dyno will rarely give identical numbers on back-to-back runs...

So just go and buy a COBB the incredible sound it makes is so intimidating that it reduces the horsepower of nearby cars by at least 10 hp
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Old 10-18-2001, 06:21 PM   #20
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Quote:
base WRX's make around 180 hp to the wheels while 2.5 RS makes less than 100~!!
Did you pull these numbers out of your ass? The WRX has 60hp more than the RS and an almost idential drivetrain, meaning almost identical drivetrain losses. How you expected the WRX to get 80hp more to the wheels eludes me.

Most likely you are comparing numbers from different types of dynos (like a WRX modded to run FWD vs an RS running AWD).

SCC did an intake shoot-out a year or so ago (maybe 1.5 years) for the RS. 12-15hp for quality intake was typical with NO OTHER MODS. For a number of reasons, the RS responds very well to intake upgrades. The most likely reason is the tortuous path of the stock intake tract and the low quality of the stock filter.


Ben
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Old 10-18-2001, 07:15 PM   #21
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Quote:
Originally posted by LttLDGN
If those tests were performed on a STOCK car.... the car would be an WRX...which falls under my "TURBOCHARGED CAR"
any forced induction car would benefit more from intake/exhaust mods than N/A simply because it makes it easier to force more air in....
it's not turbocharged or supercharged or modified! we are talking about intakes for a 2000 and up impreza 2.5RS. remember, WRX's aren't the only subies out there. as for the HP numbers, i think there are 3 ways to measure them (awd cars only). one is at the flywheel (where the test for the charts above are taken from). the other 2 are at the wheels but you can get the results as RWHP or AWHP (not sure if this is the right way to say it but bear with me) the rear wheel HP conversion gives a 2.5 something around 120 hp (60 less than the WRX, like bsqauare said) or u can give it as AWD HP which is the power over the 4 wheels which comes to like 95 i believe.
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Old 10-18-2001, 07:33 PM   #22
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The SCC article you all are talking about is the Project 2.5RS article (March 2000, pg. 160). The JC Sports intake actually lost 28hp because it ran to lean. The intake with an Apexi S-AFC to help with the lean condition gained 12-16hp depending on which intake you used (JC Sports and Minnam with Minnam making more hp).

So yes, 16hp can be had from an intake alone on a MAF based 2.5RS. The Minnam intake wasn't tested without an air/fuel controller.
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Old 10-18-2001, 09:37 PM   #23
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..... hrm... the hp amounts should be fairly accurate and i do belive they are for the WRX.... the WRX has been 4-wheel dyno'ed at 180 hp to the wheels.... the RS has much less somewhere around 100.... i'm not sure about 2.5 RS numbers... but i know that stock WRX's dyno in at 180

and i am NOT putting down 2.5 RS's .... i love those cars....and only got a WRX cuz i wanted a turbocharged car..(read: easy mods)

NO stock Non-turbocharged 2.5 RS will make 180 hp.....
only exception would be HP measured at the flywheel with aftermarket exhaust...... I highly doubt that cobb lists flywheel power.... only car manufacturers list HP by flywheel hp... almost ALL aftermarket comanies list HP by power to the wheels......

anyways... lets get back to the REAL topic... help this guy out with what to do~!! (leave me outa it~!! ) j/k
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Old 10-18-2001, 10:38 PM   #24
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if it was for the WRX, why would it be mentioned in the NA forum?
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Old 10-18-2001, 10:52 PM   #25
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Quote:
Originally Posted by: KillerTHC

if it was for the WRX, why would it be mentioned in the NA forum?
this is in the N/A forum...the figures were taken from cobb tuning
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