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Old 09-25-2004, 08:41 PM   #1
berzerkled
Scooby Newbie
 
Member#: 40200
Join Date: Jul 2003
Location: Winnipeg, Canada
Vehicle:
2002 WRX
Cobb Stage 2.5

Default Cobb Stage 2.5 VF34 Won't Hold Boost

So I was driving on the highway going to the track today and when I went to pass people and dropped it into 4th gear and gaver', my boost would go low, high, low, high, it just won't hold as it should. I think this may be related to the problem of why I can't get into the 12s as well. Any ideas?
Mods: Complete Cobb Stage 2.5 with PWR TMIC and Walbro fuel pump
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Old 09-26-2004, 09:13 AM   #2
Brad B.
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Member#: 10292
Join Date: Sep 2001
Location: Dearborn, MI
Vehicle:
2002 WRX Sedan
Silver

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How long have you had the reflash? My 2.5 took a few weeks to learn my mods. Also, the TMIC might be the cause. The reflash doesn't call for one and usually a TMIC isn't within the "learning" ability of any reflash. All TMICs are differant as well, so no map could be universal.
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Old 09-26-2004, 12:52 PM   #3
berzerkled
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Location: Winnipeg, Canada
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Cobb Stage 2.5

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had it for about 3 months now but i never really go out on the highway so i didn't really notice it till now. i've never had anything like this happen to me within the city
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Old 09-27-2004, 10:27 AM   #4
Kitt
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Join Date: Sep 2002
Chapter/Region: Tri-State
Location: Long Island, NY
Vehicle:
2006 Legacy GT
2015 WRX STi

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When I installed the Cobb VF34 setup I started hearing a hissing noise from the bpv area at full boost (hitting around 16.5-17psi). I tried replacing the bpv gasket but still heard the same noise. So I gave up and bought a forge bov, before the installation I went for a drive to see how much psi I was hitting that day (16.5psi). Then I installed the new bov and started hitting 18-18.5psi. So maybe you have the same problem.
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Old 09-27-2004, 04:48 PM   #5
berzerkled
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Member#: 40200
Join Date: Jul 2003
Location: Winnipeg, Canada
Vehicle:
2002 WRX
Cobb Stage 2.5

Default

just an fyi- it was the boost hose, put the cobb hose back in and everything is okay, max boost is 18.3
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Old 09-27-2004, 09:24 PM   #6
Brad B.
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Silver

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Cobb hose? Do you mean factory hose?
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Old 09-28-2004, 04:04 PM   #7
berzerkled
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Member#: 40200
Join Date: Jul 2003
Location: Winnipeg, Canada
Vehicle:
2002 WRX
Cobb Stage 2.5

Default

no, the cobb hose that you have to ask them for to get
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