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Old 03-28-2010, 08:35 PM   #1
jmac0101
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Default HELP! very low idle

hey guys. so i just installed an AEM short ram intake. my 06 wrx has an uppide/downpipe, STI TMIC, VF39 turbo, cobb AP vf39 tune. my idle was 1,000 rpms before i put on the SRI. but now it is idling around 500 rmps. it feels like its going to die if i dont get the rpms around 2,000 when releasing the clutch in 1st gear. i know on the AP you can adjust the idle. is that what i should do? or do i have a problem???
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Old 03-28-2010, 08:36 PM   #2
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should i just put the stock airbox back on? and forget the AEM SRI? or should i keep it. im a newbie so please be kind....
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Old 03-28-2010, 08:43 PM   #3
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did you rescale the maf voltage?
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Old 03-28-2010, 08:44 PM   #4
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Quote:
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did you rescale the maf voltage?

no.

please help explain more....
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Old 03-28-2010, 08:46 PM   #5
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well if the piping diameter changed where the mass air flow is the you need to rescale the maf voltages in order for your ecu to know how much air its actually getting. I have no exp with AP so I dunno if you can do it with that but I use opensource
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Old 03-28-2010, 08:47 PM   #6
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^^^ thanks man. could someone else chime in and help me more????
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Old 03-28-2010, 08:48 PM   #7
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that or maybe your getting unmetered air entering after the maf
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Old 03-28-2010, 08:56 PM   #8
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ya idk.
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Old 03-28-2010, 09:01 PM   #9
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wow. all these views and my fellow subie fans dont want to help. come on guys???
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Old 03-28-2010, 09:14 PM   #10
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If the diameter of the new intake pipe is different from the stock diameter, it will cause problems. Put the stock one back on. If you have to get and intake, pick up a K&N or a Cobb.
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Old 03-28-2010, 09:18 PM   #11
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Quote:
Originally Posted by Bug-Rex View Post
If the diameter of the new intake pipe is different from the stock diameter, it will cause problems. Put the stock one back on. If you have to get and intake, pick up a K&N or a Cobb.

thanks man. that helps alot. thats probably what im gunna do.
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Old 03-28-2010, 09:18 PM   #12
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Are you reading the tach correctly?
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Old 03-28-2010, 09:21 PM   #13
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Are you reading the tach correctly?

i assume so. idk. its below the 1 and right on the line below the 1.
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Old 03-28-2010, 09:22 PM   #14
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By the way anytime you reset the ecu it will take 100 miles for the ecu to relearn itself. Let the car idle for 10 to 15 minutes before driving or it will dip down on the tach and try to shut off.
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Old 03-28-2010, 09:23 PM   #15
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Quote:
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i assume so. idk. its below the 1 and right on the line below the 1.
tach goes 0, 500, 750, 1000

500 is the mark that is a hair away from zero
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Old 03-28-2010, 09:28 PM   #16
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Quote:
Originally Posted by Want_To_Buy View Post
tach goes 0, 500, 750, 1000

500 is the mark that is a hair away from zero

oh... so i was at 750??? umm so keeping the aem intake is ok??? i should just let the car idle for a while before driving it?
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Old 03-28-2010, 09:28 PM   #17
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Old 03-28-2010, 09:29 PM   #18
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^^^ or should i just put the stock airbox on?
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Old 03-28-2010, 09:30 PM   #19
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Quote:
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thanks alot man i appreciate your help. i was tacking 750 is that bad?
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Old 03-28-2010, 09:32 PM   #20
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^ That's perfect

I wouldn't just go out and buy a K&N or Cobb.. as all aftermarket intakes are generally the same, meaning if you have a problem with one, you'll probably have same issues with a new one.

Since you have a protune, I would suggest getting the MAF rescaled for the new intake, whoever tuned your car will probably give you a discount for a retune, plus you'll probably get more power that way.

You may also want to check if there is a leak somewhere in the intake post MAF. 750 idle is pretty normal though, so if that's where you are, you shouldn't worry about it. I would log AFR's and maybe check your knock correction tables after driving for a while just to see how much the intake is altering the car..
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Old 03-28-2010, 09:35 PM   #21
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Quote:
Originally Posted by Quattro71 View Post
maybe check your knock correction tables after driving for a while just to see how much the intake is altering the car..
Knock value gets reset after a ecu reset, hence why he should wait 100 miles before dogging it.
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Old 03-28-2010, 09:38 PM   #22
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Quote:
Originally Posted by Quattro71 View Post
^ That's perfect

I wouldn't just go out and buy a K&N or Cobb.. as all aftermarket intakes are generally the same, meaning if you have a problem with one, you'll probably have same issues with a new one.

Since you have a protune, I would suggest getting the MAF rescaled for the new intake, whoever tuned your car will probably give you a discount for a retune, plus you'll probably get more power that way.

You may also want to check if there is a leak somewhere in the intake post MAF. 750 idle is pretty normal though, so if that's where you are, you shouldn't worry about it. I would log AFR's and maybe check your knock correction tables after driving for a while just to see how much the intake is altering the car..

so 750 rmps. is a good idle? i was getting worried over nothing? also its just a cobb map. i dont have a pro tune. also i dont really know what AFR's are? please help me out im a newbie. just learning and want to learn more.
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Old 03-28-2010, 09:39 PM   #23
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Quote:
Originally Posted by jmac0101 View Post
so 750 rmps. is a good idle? i was getting worried over nothing? also its just a cobb map. i dont have a pro tune. also i dont really know what AFR's are? please help me out im a newbie. just learning and want to learn more.
750 is normal. Stg 2 maps idle a tad lower than factory maps.
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Old 03-28-2010, 09:40 PM   #24
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Wait. My car idles right at 500 rpms. Is that bad????
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Old 03-28-2010, 09:42 PM   #25
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Quote:
Originally Posted by Want_To_Buy View Post
750 is normal. Stg 2 maps idle a tad lower than factory maps.


ok good i got worried. thanks alot. just want to make sure im not hurting my car by having this intake on.
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