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Old 09-10-2003, 11:40 AM   #1
TheBaumer
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Default air intake for wrx pros and cons

I know i've heard in the past a cold air intake doesnt help our ehbine but what pros an cons does it have? BTW thinking about geting one. yay or nay OH and I have a 04 WRX wrb no mods yet
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Old 09-10-2003, 11:46 AM   #2
digitaltekniq
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No benefit on an essentially stock WRX, more likely to cause MAF misreadings and inconsistent performance than anything.
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Old 09-10-2003, 12:01 PM   #3
TheBaumer
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yeah ive heard a lot that it doesnt help performance but i still dont understand why and are there any pros to having one?
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Old 09-10-2003, 12:15 PM   #4
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pros= looks cool

cons= distorted mafs readings
lots of hesitation
lose a 1/2 pound of boost
bad drivability
builds boost slower
loss of overall power
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Old 09-10-2003, 12:38 PM   #5
boostaddict
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Quote:
Originally posted by blackie
pros= looks cool

cons= distorted mafs readings
lots of hesitation
lose a 1/2 pound of boost
bad drivability
builds boost slower
loss of overall power
I'm not sure about the other intakes, by I have a K&N Typhoon CAI that's great. No MAF problems or CEL in the 3000 miles I've had it. No noticable boost increase, but it does spool up a bit faster. No noticable loss of power or hesitation either.

As for driveability, the throttle seems a bit more sensitive, which makes it hard to cruise through a parking lot at low speeds in first gear.

I don't see how a less restictive intake could ever cause problems. The trick with the MAF is getting the intake inside diameter and mouting orientation the same as the stock intake. Which K&N seems to have done very well.
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Old 09-10-2003, 01:03 PM   #6
blackie
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is your car stock? and maybe the typhoon is a good design, ive heard nothing but good about it. but in most cases cai hurt more than help.
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Old 09-10-2003, 01:24 PM   #7
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Let's look at what Cobb does with an intake for example. You spend $200-$300 for an APS intake and it will yield a whopping 5HP after tuning. That money is best spent on stuff that will give you real HP. For $300 you can get a lightweight pulley AND some IC hoses which will yield around 15HP. An intake is really only needed if you are producing MAJOR HP and your money is best spent on better bang/buck mods. There are a few out there that shouldn't fool with your MAF sensor....Perrin, APS, Typhoon, TurboXS come to mind. Most manufacturers have fixed this problem in their current lineup though. It aint worth the money though in my opinion. Previous searches here tell me that the stocker is good for 300-400HP depending on who you talk to. Another case in point....Vishnu offers NO intakes for any of their stages.
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Old 09-10-2003, 01:42 PM   #8
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Quote:
Originally posted by blackie
is your car stock? and maybe the typhoon is a good design, ive heard nothing but good about it. but in most cases cai hurt more than help.
So far yes. I have an uppipe I'm waiting to install, and a downpipe I'm waiting to buy.
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Old 09-10-2003, 01:44 PM   #9
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Quote:
Originally posted by Unabomber
That money is best spent on stuff that will give you real HP.
Agreed. Performance mods should almost always be in order by the best bang for the buck. Fortunately, I didn't pay for my K&N, it was a freebie along with the installation.
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Old 09-10-2003, 04:24 PM   #10
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ive got the injen cai, no performance felt intially, when the car was stock. it made my boost go up about .5 psi, plus colder air is better obviously. i have had no cels at all or distorted maf readings
downsides it makes u run a little lean
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Old 09-10-2003, 07:57 PM   #11
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I have had the AVO intake and pipe in my car for about 20K miles. Never had any problems except when we had a turrential downpour and somehow the filter got wet. As a side note, after installing the TXS axel back, it almost seems the car is running rich, but it could also be I just put the uppipe in last weekend and the ECU hasn't adjusted yet. Only real advantage I see, with a short ram anyway, is you get a little more power (key word "little") in the low rpm range, and the cool air-sucking sound when you hit the throttle.
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Old 09-10-2003, 08:37 PM   #12
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A High Flow Intake will always outperform the stock one provided is tuned properly. On our WRX's the tuning is very tedious and complicated, so the best solution is to get a High Flow intake with the stock ID at the MAF mounting point.

- The new APS 65mm intake does wonders. No CEL's, no harmfull misreadings by the stock MAF sensor. However no serious gains would be gain until some sort of engine management is perfomed.

In brief for generic Stage 1 levels (280-310hp) you are better off buying the Generation Plastics silencer bypass and a High Flow Drop-in filter.

For Stage 2+ levels and above (320+hp) you will benefit from the APS 65mm or similar intake.

There is nothing wrong with putting a lets say... a 70mm intake, however recalibration would have to be done henced creating a terrible $$$ vs. performance gain ratio. That's why while Hondas tend to benefit from gigantic intakes WRX don't because of the MAF position in the system.
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Old 09-11-2003, 02:14 AM   #13
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Quote:
Originally posted by zacek

In brief for generic Stage 1 levels (280-310hp) you are better off buying the Generation Plastics silencer bypass and a High Flow Drop-in filter.
I am looking to stay around that power level (I autocross in STX).... is this also true vs. short ram intakes? "Training the WRX" claims that short rams are better than CAIs, but doesn't really talk about at what power levels/if those matter. Currently I was thinking of going with a Perrin short ram, but if the GP silence bypass will do as well for less, I am game .

Also... I found GPs website and the bypass you refer to, but none of their listed dealers seems to have it on their websites... how much is it? Can I just get it from any of the distributers?

Thanks!
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Old 09-11-2003, 12:38 PM   #14
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What effect would a drop in K&N filter do to performance?

Matthew
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Old 09-11-2003, 01:38 PM   #15
Styley1
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Quote:
Originally posted by bluimpreza00
What effect would a drop in K&N filter do to performance?

Matthew
Improved air flow across the filter. A few HP at most.

That said, I've used K&N drop-ins in my cars for the last 10 years. Great construction, very good life. And you can clean them and put them right back in!

Rich
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Old 09-11-2003, 02:26 PM   #16
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good info guys. THANKS!
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Old 09-11-2003, 03:25 PM   #17
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Thumbs up

i've had the turboXS short ram for over 3000 miles now, no problems at all. the diameter is also the same as stock
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Old 09-11-2003, 04:45 PM   #18
zacek
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the only problem with short-rams even is stock ID is that they are drawing the same warm air form the engine over and over. For autoX u pretty much suck in warm air between slows and accels. I think that for autoX the GP adapter and a drop-in will do wonders. It might be possible that the short-ram will induce a tiny-bit better acceleration but no one has measured this yet as on real driving there is heat involved.

DO a seach in the FFI forums for "plastic elbow" I think is going for $35.
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Old 09-11-2003, 05:44 PM   #19
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I've had the Typhoon, free from K&N Thankyou .

To me it does not feel that much different from stock. But the sound is great. Even from outside, you can hear that thing suck in air.

With my TurboXS RFL bov, and my exhaust, I have surround sound.

So I dont think that you are gonna get a whole lot of power from this thing unless you have massive amounts of power already.

300-400 bucks, get a COBB reflash, my next mod .

But its still really fun, to hear it suck in air, and the turbo spool up, uber fun.
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Old 09-11-2003, 08:37 PM   #20
stevedood
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Safe, cheap mod advice for your intake
1. Remove the snorkel (silencer) & cover up hole in wheel well
2. Get a Perrin Foam Panel Filter

You might get a CEL at startup but reset the ECU (rem neg batt terminal & depress brake pedal)

You will like the sound at 4krpm
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Old 09-11-2003, 08:56 PM   #21
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I tried that mod, and the sound is nowhere near the same as a short ram. You can barely hear it when the radio is on and windows open, but is a hella lot cheaper than a new cone filter and larger intake pipe.
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Old 09-11-2003, 10:02 PM   #22
Boost Boy
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I was looking into a Injen, K&N Typhoon, or AEM CAI, but what are the + and + of a CAI vs. a short ram intake. I really like the Typhoon
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Old 09-11-2003, 10:15 PM   #23
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I Dyno'd a Blitz SUS on a car with just exhaust and header. Nothing else. Gained 10 whp with no additional tuning. Very impressive results. I would go with that if you want to get an intake. As I've mentioned before, it outflows any other intake I have ever tried and does not cause any MAF problems.
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Old 09-12-2003, 09:22 AM   #24
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I may go with the K&N Typhoon,

skoobywrx: How did you get it free? I want one free.

Matthew
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Old 09-12-2003, 01:01 PM   #25
zosima
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Default cold air box

What about: http://nextcollection.com/html/ORD-A...14403-none.cfm

Short ram + cold air! Anyone try it? Apexi has a good name... I am tempted .

Any other cold air box manufactures out there? I have seen the Weapon-R one, and aparrently Generation Plastics is working on one. I think this might be where I would want to go if anyone has had success with them.
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