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Old 11-25-2008, 02:07 PM   #1
jt0thevizzle
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Default Wrong intake...

I have an 05 Subaru RS and I bought it used. It came with an aftermarket intake which was for a 03 WRX or RS i'm not sure. it has been on for at least 10,000 miles and the car has 80,000 miles, like i said I don't know how long it has been on because I bought it with it on. No check engine light and it fits perfectly. should I be concerned? Its an AEM CAI intake.


Oh and the only problem I had was I noticed my idle rpm was in the 1000 range when I first bought the car. And when I replaced my car battery my ECU reseted and then it stalled once or twice (I didn't know I was suppose to warm it up or anything) so I drove it to a near by crappy mechanic and they took a device hooked it up and lowered the rpm idle, not sure what they did but it was a little computer with a wire attaching to, I want to say the throttle body or somewhere near there (but i'm not sure) ... and now it idles at like 700-800RPM, and everything works fine.

Regardless should I still be concerned?
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Last edited by jt0thevizzle; 11-25-2008 at 08:07 PM.
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Old 11-25-2008, 02:15 PM   #2
PARANOID56
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what intake? if it fits and everything is hooked up fine, they you should be ok
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Old 11-25-2008, 06:01 PM   #3
RaceFaceXC
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check out the stickie about SRI's/CAI's. it will give you the 411 on intake's for MAF based n/a subaru's, what is a good idea/bad idea, how to remedy the problem and still get almost all the performance potential of a SRI/CAI. there are some potentially harmful effects of running a SRI/CAI on your car, specifically.
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Old 11-25-2008, 06:21 PM   #4
matthewlikewhoa
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Quote:
Originally Posted by RaceFaceXC View Post
check out the stickie about SRI's/CAI's. it will give you the 411 on intake's for MAF based n/a subaru's, what is a good idea/bad idea, how to remedy the problem and still get almost all the performance potential of a SRI/CAI. there are some potentially harmful effects of running a SRI/CAI on your car, specifically.
+1 go for the hybrid setup
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Old 11-25-2008, 07:14 PM   #5
LTracer
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Running the A/C or defroster (A/C Compressor is triggered by defroster) will cause higher intermittent higher idle. Even with the MAF issue noted above you should be able to achieve normal idle because it's in closed loop and under very little load. I would start with checking your long term fuel trims if you have the capability. What type/size intake do you have? If it's a much different diameter than stock it's possible your MAFv could be way off and need scaling..
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Old 11-25-2008, 07:22 PM   #6
jt0thevizzle
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Quote:
Originally Posted by LTracer View Post
Running the A/C or defroster (A/C Compressor is triggered by defroster) will cause higher intermittent higher idle. Even with the MAF issue noted above you should be able to achieve normal idle because it's in closed loop and under very little load. I would start with checking your long term fuel trims if you have the capability. What type/size intake do you have? If it's a much different diameter than stock it's possible your MAFv could be way off and need scaling..
Running the AC and Defroster seems to idle perfectly fine... it does not jump my idle too high at all, all seems to be under 1000RPM when cranked to the fullest.

How would I go about checking what you mention above? All I know is that it is an AEM CAI intake. I want to say it is exactly like this one on this site:
http://www.car-stuff.com/carparts/su...1821472p1.html
but i'm not sure because on the AEM site it says they don't make one for my RS but here it says they do(and it does not show the filter and bypass filter which I also have). Regardless that is how it looks like and I hope that answers some of the questions asked above.

And is scaling what I mentioned before? When the guy hooked the computer to the car and did that little programing thing and telling it how much to idle?

Last edited by jt0thevizzle; 11-25-2008 at 08:24 PM.
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Old 11-25-2008, 09:20 PM   #7
RaceFaceXC
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scaling is more like telling your computer how big your new intake diameter is so that when it measures a parcel of air, it knows the factor to apply to it to calculate for proper fueling. you can see why the computer thinking less air is being taken in than actually is (due to a larger diameter intake pipe) could lead to not enough fuel being injected. too lean is a bad thing.

The guy who adjusted your idle didnt rescale the intake, the two are probably not related. I have no idea what he did. But to rescale your intake, you will need to have a laptop with windows XP/Vista or MacOS and a tactrix cable ($65 and up) and then time, little gas to burn, some reading to do... or if you just want this to be scaled better and then not touch it again, you could have a local tuner do it for you for a few $. you need to have it rescaled multiple times to get it nailed, though. If ur not looking for performance, OEM is the way to go. It's factory scaling isnt perfect, however.
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Old 11-25-2008, 09:43 PM   #8
jt0thevizzle
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damn... i don't want to have to spend the money to buy an oem intake. =/
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