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Old 08-07-2012, 08:21 PM   #1
EffDotJay
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Member#: 320993
Join Date: May 2012
Chapter/Region: MAIC
Location: VA Beach
Vehicle:
2005 Sti
Aspen White

Default 05 sti underboosting help?

i have a 05 sti and i been datalogging and wont hit peak boost it peaks at 10psi with stage 2 HWG. any questions or ideas would be appreciated. thanks in advance.

MODS
-Cobb sf intake w/ samco after maf
-Samco turbo inlet
-Turbo Xs fmic/ricr bov
-SPT CBE
-No name DP


link to datalog: https://docs.google.com/spreadsheet/...lczVWZnVGxkd1E
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Old 08-08-2012, 04:10 AM   #2
jebjkey
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Location: Naples, ITALY
Vehicle:
2005 STi
2006 Evolution MR

Default

link does not work.

~9-10# is WG spring pressure. You either have something wrong with your boost control system or you have a leak.

Check for leaks and proper setup of components in the boost control system. Cobb has an article on their website that explains how the boost control system works.

When did you notice the problem? Just after the install of the FMIC?
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Old 08-08-2012, 09:09 AM   #3
EffDotJay
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Originally Posted by jebjkey View Post
link does not work.

~9-10# is WG spring pressure. You either have something wrong with your boost control system or you have a leak.

Check for leaks and proper setup of components in the boost control system. Cobb has an article on their website that explains how the boost control system works.

When did you notice the problem? Just after the install of the FMIC?
Here's the link try that. https://docs.google.com/spreadsheet/...lczVWZnVGxkd1E

There's no leaks and it happend after I flashed it to stage 2 and removed the mbc
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Old 08-08-2012, 09:59 AM   #4
Cobb Tuning
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Quote:
Originally Posted by EffDotJay View Post
Here's the link try that. https://docs.google.com/spreadsheet/...lczVWZnVGxkd1E

There's no leaks and it happend after I flashed it to stage 2 and removed the mbc
You need to check your wastegate lines and make sure the restrictor pill is there (and you are using the correct one). Some more details here:
http://www.cobbtuning.com/Technical-...es-s/70674.htm

Bill
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Old 08-08-2012, 11:02 AM   #5
EffDotJay
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Aspen White

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Quote:
Originally Posted by Cobb Tuning View Post
You need to check your wastegate lines and make sure the restrictor pill is there (and you are using the correct one). Some more details here:
http://www.cobbtuning.com/Technical-...es-s/70674.htm

Bill
the WG line is snug on and the restrictor pill is installed on the compressor side. could it be the BCS thats causing the problem? because before i flashed the ecu i was able to hit peak boost and when i flashed it and took off the mbc and hooked up the stock bcs and lines it wouldnt hit peak boost. i also read that you can put the car in test mode and check if the bcs clicks then its fine and i did that and it clicks.
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Old 08-09-2012, 08:34 AM   #6
Cobb Tuning
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Quote:
Originally Posted by EffDotJay View Post
the WG line is snug on and the restrictor pill is installed on the compressor side. could it be the BCS thats causing the problem? because before i flashed the ecu i was able to hit peak boost and when i flashed it and took off the mbc and hooked up the stock bcs and lines it wouldnt hit peak boost. i also read that you can put the car in test mode and check if the bcs clicks then its fine and i did that and it clicks.
Well, if boost was fine before with the MBC, then it either has to be the routing of the vacuum lines, wrong pill, or bad BCS.

Bill
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Old 08-12-2012, 01:39 PM   #7
EffDotJay
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2005 Sti
Aspen White

Default

Bad BCS problem fix. please Delete
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