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Old 07-04-2014, 04:45 PM   #1
wrxstiboost
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Default 2006 Sti not making full boost, can someone help?

Hi guys, i have a 2006 Sti that is stage 2. The mods are a catted down pipe, catback, SPT intake and cobb AP. I have a boost gauge as well and have done live boost on my AP. I am only making about 12.5lbs to 13. I have looked for leaks and found nothing, car runs excellent and no CEL. I changed out my factory boost control solenoid with another one i bought from a guy but no change. Today however, i disconnected the line running to the T by the turbo and took it out. I was careful and it did reach 17 lbs. What does this tell me? Are both boost control solenoids i used bad? Why does it go to 17 with the boost control solenoid hose disconnected? thanks for any help.
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Last edited by wrxstiboost; 07-04-2014 at 04:45 PM. Reason: spelling
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Old 07-04-2014, 04:52 PM   #2
Fender137
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Disconnecting hoses is not going help solve your problem, it may cause further damage to the motor. Have you tried a HWG map? Have you checked for exhaust leaks, intercooler/ hose leaks? Have you run some datalogs?
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Old 07-04-2014, 05:01 PM   #3
wrxstiboost
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i am actually running the HWG map now but that hasn't solved it. I have looked over for leaks and have the exhaust checked for leaks as well but nothing. I had only disconnected the hose from the boost control solenoid temporarily to see what it would do. I had read that if you disconnected that and still didn't make target boost there was a problem.
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Old 07-04-2014, 11:05 PM   #4
wrxstiboost
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Anyone else? would love to get this fixed. I just keep reading that if i disconnected the vacuum line from the boost control solenoid and i make target boost, then that says there is something wrong with my BCS. Is that accurate?
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Old 07-04-2014, 11:20 PM   #5
Blackfin
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Can you log with your AP and look at wastegate duty cycles?

Can you use and hand-pump to apply pressure to the wastegate actuator to determine where it begins to open?
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Old 07-05-2014, 08:57 AM   #6
wrxstiboost
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i can't really log because my AP is only the version 1. Could that be part of the issue here?
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Old 07-05-2014, 09:34 AM   #7
wrxstiboost
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its been muggy and around 80 here lately, maybe that has something to do with it
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Old 07-07-2014, 11:32 AM   #8
juice91si
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This happened to me, turned out that I was in limp mode due to a failing maf sensor. NO CELS, found the issue by reading data logs and seeing lower than usual g/s.
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Old 07-07-2014, 02:04 PM   #9
veel86
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How are you testing for boost leaks?
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Old 07-07-2014, 03:00 PM   #10
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Isn't that how they act without the magic pill?
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Old 07-07-2014, 03:14 PM   #11
veel86
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Quote:
Originally Posted by Scooby06doo View Post
Isn't that how they act without the magic pill?
Explain...
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Old 07-07-2014, 04:42 PM   #12
wrxstiboost
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actually i felt in the line coming off the turbo nipple and i can feel the pill in there. So its there. I have racked my brain on this, unfortunalty i can't data log which puts me at a huge disadvantage. I really need to upgrade my AP i guess. The weird thing is the car just runs perfect, it feels strong and i couldlnt ask for it to run better. There must be some hidden issue though. Im considering just taking it to the suby dealer and seeing if they can diagnose it.


Juice, about the MAF, how did you figure that out?

Last edited by wrxstiboost; 07-07-2014 at 04:43 PM. Reason: adds
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Old 07-07-2014, 09:50 PM   #13
juice91si
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Quote:
Originally Posted by wrxstiboost View Post
actually i felt in the line coming off the turbo nipple and i can feel the pill in there. So its there. I have racked my brain on this, unfortunalty i can't data log which puts me at a huge disadvantage. I really need to upgrade my AP i guess. The weird thing is the car just runs perfect, it feels strong and i couldlnt ask for it to run better. There must be some hidden issue though. Im considering just taking it to the suby dealer and seeing if they can diagnose it.


Juice, about the MAF, how did you figure that out?
figured it out by datalogging. Here's my old thread, and I was hitting 8psi, not 12-13 like you, but it may be worth checking out. Try your buddies MAF, takes 30 seconds to swap and you'll immediately know if that's your issue..

did you disconnect the battery to reset ECU? then see what boost it hits?

http://forums.nasioc.com/forums/show....php?t=2528800
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Old 07-07-2014, 10:21 PM   #14
wrxstiboost
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Thanks Juice, i will give it a shot. I did to a battery disconnect and it made no difference. I was looking at my access port tonight and noticed i had a stage 2 91 base map with a stage 2 93 realtime map over it. Not sure why all that was on there, i don't even use 91 gas. I changed the stage 2 91 to a stage 2 93 HWG map to see if it made any difference. I will see how it runs going to work in the morning.
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Old 07-08-2014, 12:53 PM   #15
XLR8T
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Quote:
Originally Posted by wrxstiboost View Post
Anyone else? would love to get this fixed. I just keep reading that if i disconnected the vacuum line from the boost control solenoid and i make target boost, then that says there is something wrong with my BCS. Is that accurate?
You need to disconnect the line to your boost controller AND SEAL IT. This means you will have a direct line from the compressor housing to the boost solenoid on the top of the turbo.
with this setup you should be running SPRING pressure... usually 7~9 on a stock subaru turbo.

If you just disconnect it and leave it open, your car will try and boost to the moon. My buddy tried this when trying to troubleshoot a similar boost issue. he almost blew his car up spiking to 25PSI on 91oct...
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Old 07-08-2014, 01:09 PM   #16
jdm-az-fuk
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Any updates?
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Old 07-08-2014, 03:03 PM   #17
wrxstiboost
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I am going to end up taking this to the subaru dealer and see if they can locate the issue. I have tried everything i can think of without actually data logging. Which i don't have the equipment to do right now. If i take this in do i need to revert my access port back to the stock mode? Will it matter if I'm running a catted down pipe? I really wish this was a simple issue but i have looked over lines, and shot soapy water on hoses and combed these message boards but I'm out of ideas.
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Old 07-08-2014, 06:04 PM   #18
wrxstiboost
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Good news! I was in the garage after i got home from work and decided one last time to disconnect the battery. I have done that on several occasions trying to fix the problem, always doing it the same way. Usually leaving it disconnected for 45 min. Anyways, i went back out and reconnected it the only thing i decided to do completely different was put the cap over the cobb BPV. It came with the car, i didn't put it on but it was running 50/50 but i threw the cap on (which the original owner left in the glove box) to have it fully recirculate. and started the car and let it idle for 5 minutes. I got the feeling something was just different about it. So i turned on the ac and let it idle another 5 minutes all while listening and going over the engine with a flash light and just listening. Didn't hear or see anything so i took it out for a drive. I am finally hitting my boost. I about drove off the damn road when i saw it go to 15lbs! Would the Cobb BPV been causing this the whole time?? My other question is i have the Stage 2 93 HWG map installed, should i take it out and put in the standard map? I mashed it and the needle went to what looked like 18lbs and just stayed there but no bad sounds were heard. Im so worried if i mess with something else i will lose the boost again. Thanks again for everything guys!
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Old 07-09-2014, 05:57 PM   #19
rileygreen
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hey guys im new to this website, but i am having the same problem with my 04sti it is totaly stock i only have a greddy 3inch cat back exhaust, my car has the stock boost gauge on the stearing colum. i will some times hit .1 bar boost and then it will loose boost and then not let me go over .05. i have done a leak down test on the whole system and replaced the vacum lines from the solinoid and i have even replaced the solinoid and am still having the same problem. i have disconnected the battery to reset the system and it will let me get boost but then do the same thing. if some one could give me some advice it would be great thanks.
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Old 07-09-2014, 07:37 PM   #20
wrxstiboost
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Hey Riley, i know the feeling. After you disconnected the battery and got your boost back, how many miles did you run before it reverted back to low boost?
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Old 07-10-2014, 12:01 AM   #21
alarmexpert
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Default what other problems

Is this common on the 06?
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Old 07-10-2014, 12:33 AM   #22
Scooby06doo
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Probably just a failing spring

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Old 07-10-2014, 07:40 PM   #23
rileygreen
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I'll get to 5 or 10 miles then I will loose it again,
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Old 07-10-2014, 08:44 PM   #24
juice91si
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Seriously dudes, you will quickly go nowhere unless you datalog. I was once like you, then I took 30 minutes to read how to datalog, and the issue was solved soon after. Get an AP or tactrix cable. If you want to own one of these cars, damn well better be prepared to fix em.
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