05 WRX only hitting 10psi

GiRaff3 · 10-09-2012, 10:24 PM

Hello all. Bought my WRX a few weeks ago. 103k miles, manual, only mod at the time was a Greddy Evo catback. Car felt fine, seemed to boost smooth. Last week, I bought a Cobb AP, tuned it to stage 1, drove around and was happy with the performance boost. Car felt much better. Gas mileage has been pretty bad since, dropping from ~27mpg mixed, down to around 22mpg mixed, and I have not been driving with a lead foot. I installed a boost gauge a few days after the tune and noticed the gauge was only reading 10psi. The car hits 10psi like a brick wall, I have only seen it go above 10 psi once, and it hit MAYBE 12 psi. I hooked up the AP and it sees 10 psi as well...

Where are the common spots to check in hopes of resolving this problem? I have owned several turbo cars (all Volvo before this one) and I was thinking wastegate actuator? I am still learning the ins and outs of the WRX.

Thanks in advance!

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Awais · 10-10-2012, 02:20 AM

on a stage 1 flash the target boost is 12 pounds on the ACN 91 map, and 14.5 +or-1psi. whats the exact map flash you have? also things to check are
-vacuum lines around the boost controller \ waste gate
-make sure restrictor pill is present
-test the boost solenoid make sure its functional

also are running the stock wrx top mount? i had a similar issue with the stock coupler, it had a tiny crack in it.

SlverEJ20 · 10-10-2012, 02:27 AM

^^ check those things first and get back to us.

GiRaff3 · 10-10-2012, 11:29 AM

I am using the stage 1 93guy octane map.

I am not familiar with the restrictor pill, sounds kind of like headlight fluid, LoL.

I am currently away at training with limited time to check things. I want to formulate a strong plan of attack and execute it as soon as i get home.

Thanks for the replies, I will report back.

chris@grimmspeed · 10-10-2012, 02:49 PM

Read through this and it will explain alot and also give you places to check.

http://www.cobbtuning.com/Technical-...es-s/70674.htm

Awais · 10-10-2012, 04:29 PM

you should be boosting around 14.5 give or take 1 psi. thats a great link i was just gonna post it up you can feel for this "pill"

it should be there if you haven't changed the lines around at all.

whats your DAM (Dynamic Advanced Multiplier) at also? i hear a low DAM on the Acessport the car goes into "failsafe"

to check that go monitor > scroll down > Dynamic Adv. Mul. i think thats what they use and tell us the number that shows up!

if thats not the case then we will have to do a quick data log and take a look into your boosting characteristics. but this will be later.

on a side note the waste gate opens up at 8psi... so the solenoids somewhat working

start small, keep us posted

WRXSD · 10-10-2012, 05:06 PM

You say you installed a boost gauge. Why don't you watch your boost levels on the AP and compare? It will give you current psi, and max and min down below it while you are displaying it. Also, do a third gear pull and check boost. I don't think the AP tunes hit max boost in 1st and 2nd.

trex93 · 10-10-2012, 05:28 PM

Check for leaks as well.

10-09-2012, 10:24 PM	#1
GiRaff3 Scooby Newbie Member#: 330747 Join Date: Aug 2012 Chapter/Region: MAIC Location: Poconos, PA Vehicle: 2006 Legacy GT Silver/Black	05 WRX only hitting 10psi Hello all. Bought my WRX a few weeks ago. 103k miles, manual, only mod at the time was a Greddy Evo catback. Car felt fine, seemed to boost smooth. Last week, I bought a Cobb AP, tuned it to stage 1, drove around and was happy with the performance boost. Car felt much better. Gas mileage has been pretty bad since, dropping from ~27mpg mixed, down to around 22mpg mixed, and I have not been driving with a lead foot. I installed a boost gauge a few days after the tune and noticed the gauge was only reading 10psi. The car hits 10psi like a brick wall, I have only seen it go above 10 psi once, and it hit MAYBE 12 psi. I hooked up the AP and it sees 10 psi as well... Where are the common spots to check in hopes of resolving this problem? I have owned several turbo cars (all Volvo before this one) and I was thinking wastegate actuator? I am still learning the ins and outs of the WRX. Thanks in advance! * Registered users of the site do not see these ads.

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10-10-2012, 02:20 AM	#2
Awais Scooby Specialist Member#: 295663 Join Date: Sep 2011 Location: St.Albert, Alberta Vehicle: 2004 V7 STI swap WRX Silver	on a stage 1 flash the target boost is 12 pounds on the ACN 91 map, and 14.5 +or-1psi. whats the exact map flash you have? also things to check are -vacuum lines around the boost controller \ waste gate -make sure restrictor pill is present -test the boost solenoid make sure its functional also are running the stock wrx top mount? i had a similar issue with the stock coupler, it had a tiny crack in it.

10-10-2012, 02:27 AM	#3
SlverEJ20 Scooby Specialist Member#: 157158 Join Date: Aug 2007 Chapter/Region: MAIC Location: Richmond/ Fairfax, Va Vehicle: 05 WRX stage 2 PSM	^^ check those things first and get back to us.

10-10-2012, 11:29 AM	#4
GiRaff3 Scooby Newbie Member#: 330747 Join Date: Aug 2012 Chapter/Region: MAIC Location: Poconos, PA Vehicle: 2006 Legacy GT Silver/Black	I am using the stage 1 93guy octane map. I am not familiar with the restrictor pill, sounds kind of like headlight fluid, LoL. I am currently away at training with limited time to check things. I want to formulate a strong plan of attack and execute it as soon as i get home. Thanks for the replies, I will report back.

10-10-2012, 02:49 PM	#5
chris@grimmspeed Scooby Specialist Member#: 301037 Join Date: Nov 2011 Vehicle: 2003 & 2006 WRX WRB & OBP	Read through this and it will explain alot and also give you places to check. http://www.cobbtuning.com/Technical-...es-s/70674.htm

10-10-2012, 04:29 PM	#6
Awais Scooby Specialist Member#: 295663 Join Date: Sep 2011 Location: St.Albert, Alberta Vehicle: 2004 V7 STI swap WRX Silver	you should be boosting around 14.5 give or take 1 psi. thats a great link i was just gonna post it up you can feel for this "pill" it should be there if you haven't changed the lines around at all. whats your DAM (Dynamic Advanced Multiplier) at also? i hear a low DAM on the Acessport the car goes into "failsafe" to check that go monitor > scroll down > Dynamic Adv. Mul. i think thats what they use and tell us the number that shows up! if thats not the case then we will have to do a quick data log and take a look into your boosting characteristics. but this will be later. on a side note the waste gate opens up at 8psi... so the solenoids somewhat working start small, keep us posted

10-10-2012, 05:06 PM	#7
WRXSD Scooby Newbie Member#: 136539 Join Date: Jan 2007 Location: San Diego Vehicle: 2005 WRX Wagon CGM Stg. 2	You say you installed a boost gauge. Why don't you watch your boost levels on the AP and compare? It will give you current psi, and max and min down below it while you are displaying it. Also, do a third gear pull and check boost. I don't think the AP tunes hit max boost in 1st and 2nd.

10-10-2012, 05:28 PM	#8
trex93 Scooby Newbie Member#: 333368 Join Date: Sep 2012 Vehicle: 2002 WRX WRB	Check for leaks as well.