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Old 05-04-2015, 12:28 PM   #1
jricha18
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Default Whistling Sound.....

I have searched and searched and cant find any info. I have a 2013 wrx, and recently installed Cobb SF intake and invidia catback. When I hit the gas everything is fine. When I let off the gas I get a loud whistle. Does not matter what speed, what rpm, what gear. It is only when i let my foot off the gas. My only guess is a vacuum leak? I have normal turbo sucking, under throttle, but when i let of the gas, phewwwwwwww. Any other ideas as I search for a vacuum leak?

It is not the throw out bearing, it makes the sound regardless of clutch or not.

Mods: Cobb Sf intake and Airbox, Invidia N1 dual, Cobb V3.
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Old 05-04-2015, 12:40 PM   #2
ipushfatkids
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BOV?

When you take your foot off the gas, your choking off the air your engine is sucking in. All this Boost pressure your running all of a sudden has no where to go. your boost pressure will spike and the blow off valve will open to vent that excess pressure back to the intake side of your turbo. This always happens, but is much more audible with a new intake. Completely normal!

My money is on BOV..
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Old 05-04-2015, 12:42 PM   #3
jricha18
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With my old STI, it was a quick pshh, this is like a longer hold of a whistle...not pshh but pppppssssshhhhh till I hit the gas. Still bov you think?
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Old 05-04-2015, 12:50 PM   #4
ipushfatkids
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O i see.. Well would you mind posting a short cell phone video of it? Someone else with a ej + sf intake might be able to compare it to their BOV noise then.
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Old 05-04-2015, 01:04 PM   #5
Gallo2011
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You don't have a blow-off valve. You have a bypass valve.

The suggestion to post a video is a good one. I hear all kinds of whooshy, turbo spooly sounds while accelerating and decelerating. Same Cobb SF with airbox on my car. We won't be able to tell you if the sound is normal until we hear it.
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Old 05-04-2015, 01:39 PM   #6
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How much boost are you hitting with the accessport map. Those stock plastic bpv's are known to leak over stock boost levels, as well as the plastic end caps on your oem intercooler.
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Old 05-04-2015, 01:41 PM   #7
ipushfatkids
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Oops, good catch
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Old 05-04-2015, 02:35 PM   #8
hudsonvalleybugeye
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Quote:
Originally Posted by ipushfatkids View Post
Oops, good catch

I'm a fat kid.
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Old 05-04-2015, 05:48 PM   #9
LESSthanDan
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Quote:
Originally Posted by hudsonvalleybugeye View Post
How much boost are you hitting with the accessport map. Those stock plastic bpv's are known to leak over stock boost levels, as well as the plastic end caps on your oem intercooler.
Those stock bpv are good until at least 18. Most can hold over that. Plus he's not even stage 2. I don't see why he would be pushing that much boost.
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Old 05-04-2015, 06:21 PM   #10
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Quote:
Originally Posted by LESSthanDan View Post
Those stock bpv are good until at least 18. Most can hold over that. Plus he's not even stage 2. I don't see why he would be pushing that much boost.

Ah yes, he did say just catback. A protune "stage 2" can easily see 20 lbs.
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Old 05-04-2015, 06:24 PM   #11
LESSthanDan
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Quote:
Originally Posted by hudsonvalleybugeye View Post
Ah yes, he did say just catback. A protune "stage 2" can easily see 20 lbs.
On a stock dp?

I have a fully built motor protuned to 18.5 lbs. If I remember correctly the stage 2 target boost from cobb was 16.5 lbs? Im assuming if he is for some reason running a stage 2 map on a stock dp it would only go to around that psi
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Old 05-04-2015, 06:31 PM   #12
jricha18
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It is stock dp, so only a stage 1 tune. And I'm hitting about 16lbs. So I'm hoping its not the stock bypass, as I've heard they hold up to 20's. And I'm not planning on doing any big mods anytime soon. I will try and get a video when I get a chance.
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Old 05-04-2015, 06:43 PM   #13
foxonwheels
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My 2013 with AEM intake does the same thing, usually when I let off after light/partial throttle. Heavier throttle leads to the standard bpv whoosh. Personally I don't think it's anything, just an artifact of the intake track being more audible.
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Old 05-04-2015, 06:44 PM   #14
jricha18
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Quote:
Originally Posted by foxonwheels View Post
My 2013 with AEM intake does the same thing, usually when I let off after light/partial throttle. Heavier throttle leads to the standard bpv whoosh. Personally I don't think it's anything, just an artifact of the intake track being more audible.
That's all I'm hoping. I figured I would ask to be on the safe side.
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Old 05-04-2015, 06:44 PM   #15
hudsonvalleybugeye
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Quote:
Originally Posted by LESSthanDan View Post
On a stock dp?



I have a fully built motor protuned to 18.5 lbs. If I remember correctly the stage 2 target boost from cobb was 16.5 lbs? Im assuming if he is for some reason running a stage 2 map on a stock dp it would only go to around that psi

Not on a stock dp. A "stage 2" tune would include a highflow dp. Cobb ots maps will leave a little to be desired.
I ran a protune on my 03 wrx at 21 lbs on the td04 for a bit, before changing turbo setups numerous times.
But I have seen a good bit of vf52's tuned to 20-ish lbs with stock fueling.
Do you have a fully built motor with an oem down pipe?
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Old 05-04-2015, 06:53 PM   #16
LESSthanDan
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Quote:
Originally Posted by hudsonvalleybugeye View Post
Not on a stock dp. A "stage 2" tune would include a highflow dp. Cobb ots maps will leave a little to be desired.
I ran a protune on my 03 wrx at 21 lbs on the td04 for a bit, before changing turbo setups numerous times.
But I have seen a good bit of vf52's tuned to 20-ish lbs with stock fueling.
Do you have a fully built motor with an oem down pipe?
I know stage 2 means it has a down pipe. He said he had a catback, not a turbo back which was what I was trying to point out, there's no reason for him to be pushing that much boost on a stock down pipe. You can load a stage 2 map on whether or not the vehicle is setup stage 2. I was saying he might have done that not knowing what he was doing and that could be the cause of over boost. And yes Td04 was able to handle a good amount of boost on it, yet it doesn't yield any power lol
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Old 05-04-2015, 07:49 PM   #17
hudsonvalleybugeye
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Quote:
Originally Posted by LESSthanDan View Post
I know stage 2 means it has a down pipe. He said he had a catback, not a turbo back which was what I was trying to point out, there's no reason for him to be pushing that much boost on a stock down pipe. You can load a stage 2 map on whether or not the vehicle is setup stage 2. I was saying he might have done that not knowing what he was doing and that could be the cause of over boost. And yes Td04 was able to handle a good amount of boost on it, yet it doesn't yield any power lol

The tdo4 made just fine power and it's early power. You can still make 240 on a healthy tdo4 with a pro tune, but you have that power so early in the power band. Granted the vf52 will make more, but then again, you have to deal with the car handling like an old Cadillac compared to the gd.
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Old 05-05-2015, 05:40 PM   #18
LESSthanDan
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Quote:
Originally Posted by hudsonvalleybugeye View Post
The tdo4 made just fine power and it's early power. You can still make 240 on a healthy tdo4 with a pro tune, but you have that power so early in the power band. Granted the vf52 will make more, but then again, you have to deal with the car handling like an old Cadillac compared to the gd.
Tuner can work that out. My VF39 is ported with a billet wheel and I barely feel any more lag than when I was on a td04. Granted the forged internals drop the rotating weight and allow it to rev faster. Either way the td04 is basically a leaf blower lol
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