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Old 06-28-2006, 03:16 PM   #1
CPTsWRX
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Default Low Boost with AP

I just got done test driving my car after flashing the stage 1 91 oct. AP map onto it, It does feel a little more responsive, which may just be a placebo on the but-dyno. I understand that it takes a little while for the car's computer to "learn" the new maps.

I put a boost guage on a few weeks ago (the one you can get from the dealer) and wasn't sure what the measurement it showed ment, I just liked watching what my turbo was doing (it's measured in MPa what ever that is?)

Now that I have my AP though, I was driving around while watching the boost on the AccessPORT (which is measured in PSI) and have discovered that the highest boost I've been seeing is not even half of the factory peak boost of ~14PSI
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Old 06-28-2006, 03:19 PM   #2
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0.1 mpa=1 bar=14.5 psi.
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Old 06-28-2006, 03:20 PM   #3
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mpa is megapascals, just another way to show pressure... is the gauge reading ~the same as the AP?
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Old 06-28-2006, 04:11 PM   #4
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According to what abosworth said, yeah they are reading about the same. the guage peaks at .5 MPa and the best I saw from the AP was barely 7 psi, what's that all about.

It isn't anything with the AP, because I was seeing this peak boost all the way to colorado and back and even before that.

nothing else is done to it except a gutted up and down pipe, which as far as I can tell still fits the peramiters of a stage 1 flash.
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Old 06-28-2006, 04:21 PM   #5
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7psi is wastegate pressure check the lines wastegate lines and make sure you have the pill in there
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Old 06-28-2006, 04:33 PM   #6
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by pill you mean the little plastic thing that fits between the pressure lines right?
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Old 06-28-2006, 04:35 PM   #7
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there is a restrictor pill in one of the hoses closest to the compressor outlet on the turbo. this hose is off of the T.. you just have to feel for it.

are you the original owner? has this car ever had any sort of boost controller wether manual or electronic
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Old 06-28-2006, 04:38 PM   #8
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Your lines are definately not hooked up correctly...you're going to love your car when you get it fixed...
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Old 06-28-2006, 04:39 PM   #9
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good question ^ what mods do you have on the car?
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Old 06-28-2006, 04:47 PM   #10
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sounds more like you are at stage 2 w/ a gutted up/dp...though the piping may not flow enough for stg2

Did the problem start after you installed the gauges? I agree with REX8, sounds like a problem w/ lines
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Old 06-28-2006, 04:52 PM   #11
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the other owner is who bought it new, I bought it from the same dealer as he did, only two years and 105,000 miles later. I'm pretty sure he didn't do anything performance wise to it, He kept very detailed records of what he did all the way down to each oil change.

I've gutted the up pipe and the down pipes, had a TXS short air intake until I put the old one back on for Cobb's AP specs, and added the boost guage. I have a short shifter, rallyarmor mudflaps but those don't apply to this problem. And I spray painted the wheels and headlights; that's worth a few horses right
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Old 06-28-2006, 04:57 PM   #12
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personally i think its one of 2 things

1st its either a vac hose/pill issue or..

2nd your solenoid is dead/malfunctioning/clogged therefore not controlling your boost

and just go straight ahead and run stg2 youll be fine with what you listed
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Old 06-28-2006, 05:08 PM   #13
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I just took a quick look at the vac hoses and I did see what I think you are refering to as a "pill" type thing in both the part that goes from the wast gate on the turbo and also one that I remember putting in just past the T that was used to tap the hose for the boost guage.

Stage 2 it is than! I wasn't sure if these mods counted, but I am hoping to get a cheep custom bent cat back from a local muffler shop so I wasn't far away from that anyways.

Is there any way of testing the vacume hoses to find out if that is the issue, or what else could it be?
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Old 06-28-2006, 05:20 PM   #14
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Check this PDF from Cobb, its for putting in a FP16G turbo, but it has information and pictures of the restrictor pill.

http://www.cobbtuning.com/wrx/access...20ProTUNER.pdf
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Old 06-28-2006, 05:53 PM   #15
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Quote:
Originally Posted by Master2192
Check this PDF from Cobb, its for putting in a FP16G turbo, but it has information and pictures of the restrictor pill.

http://www.cobbtuning.com/wrx/access...20ProTUNER.pdf
to the original poster click on that link.. its where the yellow dot is in the first pic of the turbo assembly with the airbox.


also dont tee your boost gauge at the turbo tee it from the BPV/bov your factory bypass/blow off (whatever you personally wanna call it)
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Old 06-28-2006, 06:21 PM   #16
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So if the restrictor pill is in place, could it be that something is wrong with how the boost guage is installed or maybe something with the wastegate solenoid? Where can I go from here in diagnosing the reason I'm not reaching full boost?

The turbo obviously isn't damaged because I am getting some boost, what else could it be?
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Old 06-29-2006, 02:57 AM   #17
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you should be running stage 2 instead of 1. cobb specifically said if you have any "high-flowing" downpipe then you have to run stage 2. this should also include stock gutted downpipe.
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Old 07-06-2006, 04:15 PM   #18
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I've reflashed to stage 2 now, that hasn't solved my problem though. I have checked and double checked that the vacuum lines are all set up right and don't have any cracks/leaks. Next I plan on trying a new wastegate solenoid to see if that has any effect on it... any other suggestions on what I can do please, I'm begining to get frustrated!!
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Old 07-06-2006, 05:24 PM   #19
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sometimes holes in little hoses are hard to find.
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