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Old 08-08-2008, 02:29 AM   #1
Scooby Newbie
Member#: 51259
Join Date: Dec 2003
2007 WRX

Default not hitting target boost, or boost reading is not accurate?

Hi everyone,
so, I have Stage 1 91oct. now, no engine or exhaust mods. I did a couple of 3th and 4th gear pulls on an open road and from the AP live data readings, we were seeing boost levels peaking at 9 PSI. WTH(?) Could it just be a non-accurate reading from the AP live data or it should be a boost leaking? I do not have the boost gauge to verify the AP reading. (AP live data shows boost from -11 psi on idling engine to 9 psi)
Still, the "butt feeling" is that car is running pretty much OK and better then stock.
So, I'm what to do?
Should I try to adjust the boost system mechanically? If so, how can I do that?
Appreciate your inputs guys.
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Last edited by toxin; 08-08-2008 at 02:55 AM.
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Old 08-08-2008, 12:37 PM   #2
Scooby Specialist
Member#: 146091
Join Date: Apr 2007
Chapter/Region: NWIC
Location: Atlanta GA
14 Mazda 3


if you have any buddies w/ a wrx/sti try the boost reading's in their car.

other than that do a ECU reset (with a full tank of good gas) and then let the car idle for 5 minutes without driving anywhere...

you might have had a bad tank of gas and the ecu is pulling timeing and stuff.
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Old 08-24-2008, 03:41 AM   #3
Scooby Specialist
Member#: 166947
Join Date: Dec 2007
Chapter/Region: SCIC
Location: OC
2006 WRX Sedan
Crystal Gray Metallic


i'm also not hitting target boost. i have the stock lamco boost gauge showing peak boost at .08 Mpa which is about 12 psi. I'm not hitting the 14.8 psi target boost level that Cobb says I should be hitting. What could be causing this underachieving condition?

a) helix catted dp is lesser flowing than cobb catted dp?
b) boost leak? (can't detect it anywhere)
c) wastegate acutator arm needs to be adjusted? how common is this?
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Old 08-24-2008, 04:45 AM   #4
Scooby Specialist
Member#: 170512
Join Date: Jan 2008
Chapter/Region: MAIC
Location: Subaru Stars...Williamsburg/VA
2012 WRX
Ice Silver


Guys, remember!
Stage 1: Target is 15 PSI +- 0.7 tapering down to 12 PSI
Stage 2: Target is 16.5 PSI +- 0.7 tapering down to 13 PSI

Target boost level is peak level, that happens only sometimes under specific conditions. It all depends on temperature, air pressure and many other conditions.

Highest pressure I've seen on my Stage 2 was about 16 PSI, on 5th gear, accelerating with open throttle, when temp was about 60 degrees. Usually getting bit less when its hot outside.
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Old 08-24-2008, 09:16 PM   #5
Scooby Newbie
Member#: 39806
Join Date: Jul 2003
Chapter/Region: NWIC
2003 WRX


9 psi is mechanical boost. If you have a friend with a WRX or a STI borrow his/her OEM EBCS to see if you have premature failure of the EBCS.

Or do as keving suggested, do an ecu reset and see if boost returns...get a better tank of gas. I've had to switch stations (same company) once, so far, for bad gas.
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Old 08-24-2008, 09:22 PM   #6
Scooby Specialist
Member#: 50064
Join Date: Dec 2003
Chapter/Region: NESIC
Location: Maine
'07 WRX


What's your altitude? You loose 1lb per 2000'

But that sounds messed up--too low. In fact, maybe I'm getting bars and lbs mixed up but that vacuum doesn't sound right either.
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