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Old 08-22-2012, 10:26 PM   #1
silver007
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Hello. As title states... I own a 2007 wrx and recently went stage 2 catless, got boost creep. Installed new pill sent by cobb. Now I'm getting severe underboosting. Here is a link to a datalog I did in 3rd. I was WOT although I didn't log throttle position.
https://docs.google.com/spreadsheet/...3kzV1JVcjdiV0E

I've rechecked connections of all hoses related to turbo and intake, but don't see anywhere for obvious leaks.

Anyone have any ideas?
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Last edited by silver007; 08-22-2012 at 11:23 PM.
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Old 08-23-2012, 07:56 AM   #2
jebjkey
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What size was the pill? The bigger the pill - the higher the WDC needed to achive the same boost level and vice-versa for a smaller pill.

If your WDC is the same as before (i.e. you did not change your map) then putting in a bigger pill will lower your boost.

Try the HWG map, or use Cobb's AccessTuner Race and do it yourself, or get an etune/pro-tune.
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Old 08-23-2012, 12:20 PM   #3
silver007
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Good ideas. I'll check the pill size. I assumed cobb sent the correct size, but could be too big. I knew the setup would make less boost, but a drop of 5 psi seemed like a red flag.
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Old 08-23-2012, 05:23 PM   #4
Cobb Tuning
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The restrictor pill should be .047" (or 1.2mm). When you received the pill from us, was it in a Subaru bag with part ##22326KA120 on it?

Also, make sure the pill is in the vacuum line off of the compressor housing and not in the wastegate actuator vacuum line.

If all of that checks out, the restrictor pill is probably too big for your particular car. jbjkey had some good suggestions for you. You also have an adjustable wastegate arm that you can play with to dial in your boost levels.

Chris
COBB Tuning
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Old 08-26-2012, 09:50 PM   #5
silver007
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Chris - The pill is .047" and its in the correct spot so that's good.

Still...I'm underboosting. Attempting to tune it out, I increased the WGDC values within the high/low tables by 10%. Otherwise the map is the original OTS cobb stg 2 v3. This is the ONLY change I made to the map. Reflashed the ecu and cranked it up....immediately died. Try again/fail. Try again/fail. Try again with throttle to keep it cranked. Drove around a bit, and killed it a couple time just coming out of gear at stop signs/red lights.

Anybody know why the tune would have changed so drastically?!? I only adjusted for WOT values....
I mean I'm accustomed to the car being a little temperamental after reflash but this just feels like to much. I reflashed to the regular OTS stg 2 but the car doesn't seem healthy....I can just barely hear a sputtering noise (misfire?).

And no codes.
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Old 08-26-2012, 10:34 PM   #6
Black94Snake
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You've got a mechanical problem. It's not in your tune. Check your throttle body coupler.
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Old 08-27-2012, 10:21 AM   #7
Cobb Tuning
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Quote:
Originally Posted by silver007 View Post
Chris - The pill is .047" and its in the correct spot so that's good.

Still...I'm underboosting. Attempting to tune it out, I increased the WGDC values within the high/low tables by 10%. Otherwise the map is the original OTS cobb stg 2 v3. This is the ONLY change I made to the map. Reflashed the ecu and cranked it up....immediately died. Try again/fail. Try again/fail. Try again with throttle to keep it cranked. Drove around a bit, and killed it a couple time just coming out of gear at stop signs/red lights.

Anybody know why the tune would have changed so drastically?!? I only adjusted for WOT values....
I mean I'm accustomed to the car being a little temperamental after reflash but this just feels like to much. I reflashed to the regular OTS stg 2 but the car doesn't seem healthy....I can just barely hear a sputtering noise (misfire?).

And no codes.
Sounds like you may have a intake tract leak. I would get a pressure or smoke test of the intake tract done.

Bill
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Old 08-27-2012, 09:11 PM   #8
silver007
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Thanks for the advice guys.

Had to work until dark today, so didn't get a chance to check the throttle body coupler. I believe I have an issue with my y-pipe to intercooler gasket as well.

I'll check those out and then post an update.
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Old 03-20-2013, 07:55 AM   #9
silver007
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I forgot I made this thread, can't believe its been 7 months. I started a new thread recently but it would be best just to use this one I guess.

Anyhow, car is running now. Rebuilt the cv axles, new clutch, new radiator. I did have a bad gasket on the intercooler. I replaced it, but still not making target boost despite having increased wgdc another 10%.

I need to check for leaks. Is smoke test the best way?
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Old 03-20-2013, 09:03 AM   #10
nmlittlebigman
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I have never used a smoke tester so I cannot tell you how effective it is for finding leaks. I would imagine that it would be effective for finding vacuum leaks but boost leaks would depend on how much you pressurize the intake tract. With that said, here's what I use to test for leaks:
http://forums.nasioc.com/forums/show....php?t=2205161

I use the quick and dirty method limiting my pressure to less that 10 psi and a spray bottle with soapy water. It is very effective.
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Old 03-20-2013, 06:21 PM   #11
silver007
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thanks for the advice lbm. that's a great device.
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Old 03-20-2013, 09:16 PM   #12
SheaREX
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Interested in how things work out for you, I'm having the same problem with a stage 2 map (AP v1).

04 WRX, full cat-less turbo back/up-pipe, restrictor pill is present 1.2mm (installed so I know it is)

I did some research and messed with the WG actuator arm, went from 7.5lbs to 8.3lbs (no fluctuation at either setting) with 2 turns clockwise (shortened). Don't think I can go much more because it won't reach the little notch that goes through the hole on the arm.

Still have to check gasket on the STi TMIC. Any suggestions would be great. Thanks guys.
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Old 03-25-2013, 10:06 AM   #13
Cobb Tuning
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Quote:
Originally Posted by SheaREX View Post
Interested in how things work out for you, I'm having the same problem with a stage 2 map (AP v1).

04 WRX, full cat-less turbo back/up-pipe, restrictor pill is present 1.2mm (installed so I know it is)

I did some research and messed with the WG actuator arm, went from 7.5lbs to 8.3lbs (no fluctuation at either setting) with 2 turns clockwise (shortened). Don't think I can go much more because it won't reach the little notch that goes through the hole on the arm.

Still have to check gasket on the STi TMIC. Any suggestions would be great. Thanks guys.
Best thing to do is to get the capability to data log. You have to make sure that the ECU is commanding the correct wastegate duty (and not, say, disabling boost control due to knock). You can also check fuel trims to indirectly determine if there is a fueling issue or not (such as a boost leak which can also impact boost levels depending on severity).

You can get a $200 trade-in for your version 1 Accessport if you purchase a version 2 Accessport directly through us. The version 2 Accessport has a lot of new features compared to the version 1, including data logging from the device itself. There are also ground-up new maps for your car with the v2 Acessport. Details about the trade-in here:
http://www.cobbtuning.com/AccessPort...in-s/70459.htm

If that is not in the budget, then I would at least use the romraider open source software (with a compatible cable) to get some logs.

Bill
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