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Old 04-10-2010, 01:42 PM   #1
wrex19
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Default Help please!

Can anyone help me out I'm having trouble with my boost. I have a tbe, cobb pully, hks intake, sti intercooler. I have a cobb access port v1 and used it to tune for stage 2 on my car. I am only hitting a max of 11.5 boost when the cobb tunner says i should be hitting 15.2 give or take a few 10th's of a pound. I have reflashed and tuned twice and cant seem to figure out the problem. I had a bov 2 weeks ago o nit and then it was hitting the 15psi but as soon as i went back to stock bpv it went down to 11.5 can someone please give me some ideas as to why this is happening to my car. Im not looking to get it protuned or anything but please let me know your ideas id really appreciate it!
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Old 04-10-2010, 01:44 PM   #2
renosubby
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Quote:
Originally Posted by wrex19 View Post
Can anyone help me out I'm having trouble with my boost. I have a tbe, cobb pully, hks intake, sti intercooler. I have a cobb access port v1 and used it to tune for stage 2 on my car. I am only hitting a max of 11.5 boost when the cobb tunner says i should be hitting 15.2 give or take a few 10th's of a pound. I have reflashed and tuned twice and cant seem to figure out the problem. I had a bov 2 weeks ago o nit and then it was hitting the 15psi but as soon as i went back to stock bpv it went down to 11.5 can someone please give me some ideas as to why this is happening to my car. Im not looking to get it protuned or anything but please let me know your ideas id really appreciate it!
Might be leaking out of the bov make sure there are no leaks!
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Old 04-10-2010, 01:52 PM   #3
wrex19
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i took off the bov and put back on a stock bpv. Are the spring rates between the sti bpv and wrx different? I have an sti bpv with a stock wrx turbo. Wondering if that was anything to do with it.
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Old 04-10-2010, 02:17 PM   #4
ProdriveDreams
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its basically vacuum operated shouldn't matter
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Old 04-10-2010, 02:47 PM   #5
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It's also possible that the ECU is actively limiting boost in response to knock. If you had a V2 AccessPORT, I'd suggest taking some data logs and sending them here for review. Unfortunately logging is not possible with your V1 I would advise you do not continue to "reflash" as an attempt to correct the problem, the only thing this will accomplish is resetting the ECU's learned fueling and knock trims.

Like others mentioned, you have likely introduced a leak to the intake tract. Did you replace the BPV gasket when you switched back to factory? If not, I would recommend doing this and re-torquing the hardware to factory specs.

Regards,
Lance
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Old 04-10-2010, 08:41 PM   #6
ProdriveDreams
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Did you hook the vacuum line up to the BPV?
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Old 04-11-2010, 12:03 AM   #7
wrex19
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Ya I hooked up the bpv correctly so I don't know what's wrong. I'm not in a position right now to spend money on a tune but I want to have it running correctly. I didn't think the bpv had a gasket so mine doesn't have one on but I doubt it would make that big of an effect. I appreciate the help people. Also, does anyone know if there is a difference in bpv spring rates, between sti and wrx?
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Old 04-11-2010, 10:17 AM   #8
ProdriveDreams
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Quote:
Originally Posted by wrex19 View Post
Ya I hooked up the bpv correctly so I don't know what's wrong. I'm not in a position right now to spend money on a tune but I want to have it running correctly. I didn't think the bpv had a gasket so mine doesn't have one on but I doubt it would make that big of an effect. I appreciate the help people. Also, does anyone know if there is a difference in bpv spring rates, between sti and wrx?
??? you don't have a gasket... on the intake side... where there is metered air... and you aren't at all concerned? You realize that if you have a boost leak when your car goes into open loop the AFRs will be all ****ed up right? Not to mention you just got advice from a tuner, and your response is basically "what you say is silly, i'm going to continue following my own assumptions, because you must not know what you're talking about". Right in your first post you ask for ideas, there's an idea. Not trying to come off as a dick, but why ask for help if you aren't gonna follow it anyways.

And as stated before the BPV operates off of manifold pressure so the spring rate really makes little difference (till you hit much higher boost levels). Also I'm like 90% sure that both BPVs have the same part number.
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Old 04-11-2010, 01:38 PM   #9
wrex19
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Quote:
Originally Posted by ProdriveDreams View Post
??? you don't have a gasket... on the intake side... where there is metered air... and you aren't at all concerned? You realize that if you have a boost leak when your car goes into open loop the AFRs will be all ****ed up right? Not to mention you just got advice from a tuner, and your response is basically "what you say is silly, i'm going to continue following my own assumptions, because you must not know what you're talking about". Right in your first post you ask for ideas, there's an idea. Not trying to come off as a dick, but why ask for help if you aren't gonna follow it anyways.

And as stated before the BPV operates off of manifold pressure so the spring rate really makes little difference (till you hit much higher boost levels). Also I'm like 90% sure that both BPVs have the same part number.

The only reason I didnt take the gasket into consideration was when I went to subaru of glendale they said there wasn't one there so I didn't think it was a problem not having one. Ive only had the car about a month so Im new to this forced induvtion stuff. I will give that a shot and let people know the results. I didn't mean to insult anyones advice either im welcome to all help.
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Old 04-11-2010, 02:02 PM   #10
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Sorry if I came off a bit harsh, just lately i've been seeing so many new kids coming on the boards wanting to do stupid things rather than do it correctly nomatter what everyone tells them (like all the people in the electrical forums asking how to just wire a switch in for their parking lights, rather than fix them correctly), and its getting to me.
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Old 04-11-2010, 03:02 PM   #11
TurboWRex05
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the BPV''s are the same for the STi as for the WRX. Sounds to me like the diaphragm in the BPV could be torn, or you have a boost leak somewhere. Anyways, all BPV's and BOV's have a gasket between the valve and the intercooler. If you dont, then there is your problem. Some Subaru dealership mechanics have no idea what they are doing. Any real mechanic or even tuner knows that where metal and metal contact on a car, there is almost always a gasket between them. Sounds like a diaphragm though.
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Old 04-11-2010, 03:28 PM   #12
wrex19
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Where can i find a new diaphragm or do I have to get a new bpv? also I was driving yesterday and the check engine light and cruise light cam on. I used the v1 to check for cel codes, obd p0244 came up. not sure what that means.
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Old 04-11-2010, 03:44 PM   #13
wrex19
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P0244 Wastegate control solenoid valve malfunction (high input) This is what cam up on my v1 cel screen. What should i do to fix it?
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Old 04-11-2010, 06:54 PM   #14
TurboWRex05
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make sure all the clamps are hooked up correctly and tight. you might also have a tiny hole in one of the lines coming off your turbo, either to the T-fitting, to the wastegate, or to the BCS. I would check there first. Make sure all the hoses are clamped on to the fittings. You usually wont be able to replace just the diaphragm. You will have to buy a new BPV, or someone selling a slightly used one such as myself.
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Old 04-14-2010, 12:45 AM   #15
wrex19
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Checked the lines, doesn't look like any holes from what I can see. I am going to take it to subaru and have them check it out for me. Hopefully that fixes my problem. Im going to get a bpv gasket while its there. If that doesnt fix my problem ill post back and hopefully you guys have more advice to give. Thanks for the input people i appreciate it
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