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Old 09-22-2012, 03:03 PM   #1
Subiezilla
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Hello, A bit of background: I have a 09 wrx cobb stage 1 +sf intake and spt boost guage (no exhaust mods), I have been running this set up for over a year with no problem always hit the target 15 psi. Drove home from work yesterday and had no issue but later on that night when I drove again wot on the free way ,3rd gear, it would not go past 12-13 psi. I then tried a couple of WOT pulls to see if it was a fluke but with same result :-( . I do not believe it was boost leak as I did not hear any strange noise, I had the TB to IC hose leak once and it squealed like a pig. After some searching I have narrowed it down to maybe a bad batch of gas? I filled up Thursday night and problem manifested Friday night. Could adding octane booster help?

Thanks
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Old 09-23-2012, 04:10 AM   #2
addictionsoLA
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It could be a number of things, bad gas, intake temps, developed boost leak, broken boost gauge.

Post some logs.

You could try octane booster or just run it low and fill it up with some better quality gas.
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Old 09-23-2012, 09:56 AM   #3
fr0st
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plug in your cobb AC and check the boost lvl with it and compare it to your gauge..

you need to know if the ECU sees only 12-13 psi before you start doing anything else..

I use a bluetooth dongle obd2 and setit onmy phone and use an app to seeall this stuff live..

For this reason, i don't even have a boost gauge.
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Old 09-23-2012, 12:12 PM   #4
Cobb Tuning
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Quote:
Originally Posted by Subiezilla View Post
Hello, A bit of background: I have a 09 wrx cobb stage 1 +sf intake and spt boost guage (no exhaust mods), I have been running this set up for over a year with no problem always hit the target 15 psi. Drove home from work yesterday and had no issue but later on that night when I drove again wot on the free way ,3rd gear, it would not go past 12-13 psi. I then tried a couple of WOT pulls to see if it was a fluke but with same result :-( . I do not believe it was boost leak as I did not hear any strange noise, I had the TB to IC hose leak once and it squealed like a pig. After some searching I have narrowed it down to maybe a bad batch of gas? I filled up Thursday night and problem manifested Friday night. Could adding octane booster help?

Thanks
Best thing to do would be to get a 3rd gear data log when it happens (if you can so safely):


Bill
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Old 09-23-2012, 06:12 PM   #5
Subiezilla
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https://docs.google.com/spreadsheet/...kFsSnBzdnA0V1E

did a quick 3rd gear pull, this is as safe as i was able to do it, being that i live in so-cal. I will try to see if i can get a near red-line pull done safely soon.

Update: yesterday and today I have been able to hit boost targets once again O.o , was this an isolated fluke? Also more background about the night when I couldn't make target boost, it was about 15-20 degrees cooler than its been on average....cooler temps, denser air?

Last edited by Subiezilla; 09-23-2012 at 06:19 PM.
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Old 09-23-2012, 06:22 PM   #6
Subiezilla
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Quote:
Originally Posted by fr0st
plug in your cobb AC and check the boost lvl with it and compare it to your gauge..

you need to know if the ECU sees only 12-13 psi before you start doing anything else..

I use a bluetooth dongle obd2 and setit onmy phone and use an app to seeall this stuff live..

For this reason, i don't even have a boost gauge.
I am interested in this device? What is it called? And what iPhone app do you use with it?
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Old 09-23-2012, 08:01 PM   #7
Cobb Tuning
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Quote:
Originally Posted by Subiezilla View Post
https://docs.google.com/spreadsheet/...kFsSnBzdnA0V1E

did a quick 3rd gear pull, this is as safe as i was able to do it, being that i live in so-cal. I will try to see if i can get a near red-line pull done safely soon.

Update: yesterday and today I have been able to hit boost targets once again O.o , was this an isolated fluke? Also more background about the night when I couldn't make target boost, it was about 15-20 degrees cooler than its been on average....cooler temps, denser air?
You boost is a little slow to build, but you are hitting close enough to your target - any changes/repairs/etc to the car since it was last not having the issue?

Bill
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Old 09-23-2012, 08:17 PM   #8
Subiezilla
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Quote:
Originally Posted by Cobb Tuning
You boost is a little slow to build, but you are hitting close enough to your target - any changes/repairs/etc to the car since it was last not having the issue?

Bill
None what so ever, what can I do to build boost quicker/normal rate
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Old 09-23-2012, 10:01 PM   #9
Cobb Tuning
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Quote:
Originally Posted by Subiezilla View Post
None what so ever, what can I do to build boost quicker/normal rate
Do you live at any kind of altitude at all? It isn't too bad - I would want to see a more extended run, if you can do so safely. Then perhaps you could give the HWG map a try, but doing that may cause you to overboost in higher gears.

Bill
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Old 09-23-2012, 10:24 PM   #10
Subiezilla
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Quote:
Originally Posted by Cobb Tuning
Do you live at any kind of altitude at all? It isn't too bad - I would want to see a more extended run, if you can do so safely. Then perhaps you could give the HWG map a try, but doing that may cause you to overboost in higher gears.

Bill
I live in the Los Angeles area closer to the coast so I'm at sea level.... I don't want to over boost that's for sure so I will leave as is for now. I will try to get on the highway late at night to get an extensive pull. Thanks a lot for replying back on a weekend BIll, you guys at COBB are #1
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Old 09-24-2012, 06:37 AM   #11
fr0st
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Quote:
Originally Posted by Subiezilla View Post
I am interested in this device? What is it called? And what iPhone app do you use with it?
On ebay, just type bluetooth obd2 1.5

get the V1.5 version...

the app is called Torque pro

On the iphone i dunno the name of the app but there are many


the dongle cost like 20$
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Old 09-24-2012, 05:31 PM   #12
Subiezilla
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Quote:
Originally Posted by fr0st

On ebay, just type bluetooth obd2 1.5

get the V1.5 version...

the app is called Torque pro

On the iphone i dunno the name of the app but there are many

the dongle cost like 20$
Cool thanks
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