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Old 04-28-2013, 03:35 PM   #1
pointblink19
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Default Boost loss

Hey guys,

i noticed today that my boost was significantly lower than normal, i was tuned at 22lbs and boost gauges is showing 15 with a spike at 20lbs on initial take off. I started thinking boost leak and check all the hoses but then i noticed a little tear on my inlet.

i was wondering if there are any temporary patches i can apply to see if the car will return to my tuned 22lbs when covered. I dont want to have to replace the inlet if thats not the cause of the problem.

All help is appreciated! thanks guys!

edit*
i also have an aftermarket venair turbo inlet pipe, which i believe is silicone
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Old 04-28-2013, 07:18 PM   #2
Shortpersonbk
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if there is a tear in your inlet...then thats your problem
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Old 04-28-2013, 07:47 PM   #3
HinshawWRX
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Duct tape MIGHT cover it, but just buy a new inlet and be safe.
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Old 04-28-2013, 08:58 PM   #4
art@grimmspeed
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Replacing it is the safe bet. Depending on the size of the rear it could lean the car out.
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Old 04-28-2013, 09:44 PM   #5
pointblink19
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thanks for the imput, will purchase a new inlet, my AFR gauges reads normal so thats good, hopefully that will be the only thing i need to replace
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Old 04-28-2013, 09:45 PM   #6
Shortpersonbk
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if its torn i don't see how its reading normal ....
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Old 04-28-2013, 10:46 PM   #7
pointblink19
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its not technically torn, it looks like there's a tear but it may only be superficial, might not have made its way all the way through the inlet. Hmm this makes me think this might not be my problem. I've checked all the possible vac lines and they all feel smooth so i dont think there's a leak there.

a buddy of mine told me to check the bpv gasket so i may just repalce that to see what happens.
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Old 04-29-2013, 08:19 PM   #8
pointblink19
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I did some data logging with my AP just to check if it was the gauge that was reading wrong but nope gauges read correctly and i'm only hitting about 14-15psi;

i'm going to replace the bpv gasket to see if that has any effect
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Old 04-29-2013, 09:50 PM   #9
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$90 bucks ebay silicone inlet and done.........squeeze it under the manifold.........installed and reinstalled one 2 or 3 times, takes a bit of cussing. Reinstall was done a couple times to check the compressor wheel because i thought i lost the turbo (on old setup).

Secure the shaft of the inlet with 2 or 3 worm clamps along the straight of the inlet to ensure it wont collapse under boost. My did not collapse until 27psi, and when it collapses you will know.

You go from turbo to......this car does have a turbo right? The car will feel like it is NA in boost when it should be the other way around.
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Old 04-29-2013, 10:25 PM   #10
pointblink19
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I was told in earlier posts that the car would be leaning out if it were the inlet, which it is not so im not convinced i need a new inlet yet, the car is running smooth and i am able to boost at a constant 15lbs, but im tuned at 22psi so im not sure why its not holding up to 22psi, if the bpv doesn't solve my problem, my next step was to soap and water the hoses and see if there are any bubbles.

you guys got any pressure points i should be checking the most?

i'm going to do the inlet, the boost controller hoses to the wg and turbo, and the bpv hose
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Old 04-30-2013, 11:25 PM   #11
pointblink19
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just picked up a oem bpv gasket and replaced the old one, the old on on the car was spliced into two pieces so this may be the problem. Will do some logging when i get a chance to see if it is this simple fix
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Old 05-01-2013, 01:53 PM   #12
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ive been hunting a phantom boost problem for longer than id like to admit. Did the soap and water trick last fall on practically the entire engine bay, BPV gasket replaced, turbo replaced, IC hose clamps all replaced.

Just a few weeks ago got under the car to regrease bushings and figured i'd soap and water spray the exhaust one more time....found the leak between manifold and up pipe on the top side where it's hard to see but is clearly spitting when sprayed.

2 gasket attempts later, still some spitting so i'm wondering if the flange weld is cracked so i'll have to either pull the UP or get in there with some dental mirrors or something...

Check the exhaust.
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Old 05-01-2013, 02:00 PM   #13
xBlaze89x
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BPV on my car was leaking. RTV often needs to be added between the elbow and the BPV. A new gasket should take care of between the intercooler and BPV, but if it is still having problems you could RTV that as well.
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Old 05-02-2013, 01:03 AM   #14
pointblink19
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thanks for the imput fellas, gonna do some logging when im not working all day and night LOL, hopefully i'll get an answer this weekend.
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Old 05-02-2013, 04:40 PM   #15
greenplates
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replace that sonbich
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Old 05-05-2013, 04:00 PM   #16
pointblink19
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so i did some logging this weekend and still stuck at 15lbs, afr is good, so im gonna soap and water all the lines see if theres a small leak somewhere
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Old 05-08-2013, 05:55 PM   #17
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I did a diy boost leak tester on mine using soapy water as well, found out mine was leaking the bpv gasket. Tried a new gasket applied the test and was still leaking. My problem was solved by scraping off the residue of the old bpv gasket on the sti tmic flange. There were spots on the glange that still had portions of the old gasket still there. I scraped it off with a blade and now im good to go. Also found small leaks on the maf o ring, and the fuel pressure regulator..
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Old 05-10-2013, 05:01 AM   #18
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its the process of elimination just fix it (cause it does need replacing ) and if thats not it then move on to the next possible thing case closed
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Old 05-16-2013, 08:49 PM   #19
pointblink19
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i was talking to a buddy of mine who is a great mechanic and has been working on subarus for a long time, told me it may be the ebcs that's gone bad. I contacted grimmspeed who told me it was very rare that they go bad but sometimes they do.

told me to hook up a 9-12volt to the ebcs to see if it opens and closes. will do that when i get a chance and get back to you guys.
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Old 05-17-2013, 12:21 PM   #20
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Why don't you post up some logs, too? It wouldn't hurt.
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Old 05-18-2013, 02:57 PM   #21
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One thing I noticed you guys did NOT warn the opp of is whether or not he had this tare when he was tuned it just wasnt that bad. Meaning if you put on a APS or a free flowing one compared to stock TRUST ME you will need a tune and a maf rescale more then likely. Take it back to your tuner once your done but keep an eye on your AFR's and boost. Also ask your tuner if he took out the open loop closed loop delay, if they did then feel free to enjoy the extra spool up compared to stock, if they did NOT, do not full throttle the car your AFR's will be slightly different.
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Old 05-18-2013, 03:31 PM   #22
Nolanb121
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Try replacing gaskets
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