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Old 06-05-2006, 09:37 PM   #1
Kenthro
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Default 04 STi Stage 1 - Not making target boost

I purchased an AP and reflashed my ECU to Stage 1 91 Octane last night (as 91 Octane is all that's available in my area). While most people have said that they felt the difference immediately, the only real difference I noted was that I was not making as much boost as a stock STi.

Before the reflash, I would hit .1 MPa on the factory gauge. After the flash, I can only hit .07 MPa (10.1 psi) on the factory gauge; it will hold that to redline. This occurs if I, say, go from a stop, like accelerating from a light onto the freeway. If I roll into the throttle while I'm cruising at a constant speed, I can barely touch .1 MPa (14.5 psi), but it quickly trails off to .7 MPa. I haven't had a passenger ride along to watch the real time boost readout on the AP, but would the stock gauge be that far off?

I know that people say to wait a week to let the ECU 'learn.' Does my situation sound like something that the ECU can learn around? Should I wait out the full week and then try the HWG real time map?

The STi has no engine mods save for the AP. I live at 6000 feet. There's no other real difference in drivability (no stumbling, audiable knocking, etc).
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Old 06-07-2006, 11:10 PM   #2
Kenthro
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Bump; anyone?

I had a passenger ride along and watch the instant boost readout on the AP. I'm peaking at just under 15 psi according to that.
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Old 06-07-2006, 11:16 PM   #3
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I would say 15 psi on Stage 1 is pretty good. Can you tell a difference in your butt dyno? I run stage 2 and I peak at 16-17psi. When I ran stage 1 I was peaking about 14.5. I didn't really peak much more than stock, but I noticed it felt like my torque increased a little more over stock and all around the car felt smoother.
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Old 06-08-2006, 12:34 AM   #4
Poppa smurf
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I have the same issue but I can't go over 11 PSI checking with either a boost gauge or with the AP. I think it feels slow but a subaru tech. (knows his stuff) says it feels fine but still can figure out the low readings. Its been this way for a while now and tried everything short of using a MBC.
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Old 06-08-2006, 06:21 AM   #5
clamdip
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hmmmmm...........
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Old 06-08-2006, 06:24 AM   #6
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Quote:
Originally Posted by Kenthro
Bump; anyone?

I had a passenger ride along and watch the instant boost readout on the AP. I'm peaking at just under 15 psi according to that.
the AP is getting it's boost readout straight from the ECU so i would say that this is pretty accurate. sounds like you've hit your target boost.
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Old 06-08-2006, 06:25 AM   #7
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Quote:
Originally Posted by Poppa smurf
I have the same issue but I can't go over 11 PSI checking with either a boost gauge or with the AP. I think it feels slow but a subaru tech. (knows his stuff) says it feels fine but still can figure out the low readings. Its been this way for a while now and tried everything short of using a MBC.
try do a reset again and drive the car hard to let the ECU re-learn the boost curve. or if not, give cobb a call they'll know what to do.
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Old 06-08-2006, 09:39 PM   #8
Kenthro
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The 91 Octane Stage 1 map notes say, "Target peak boost pressure is 16.5psi +/- 0.5psi depending on vehicle and conditions. Boost will likely taper to ~15psi by redline to increase reliability. This is due to high exhaust gas backpressure and thus heat created at higher RPM and high boost. When the exhaust system is further optimized with Stage2, we are able to increase boost levels at higher RPMs."

I'm barely making, at peak, what the boost should taper off to at redline.

Honestly, when I reflashed, the only difference I noticed was that the car no longer felt as fast. It used to lunge forward at about 3800 rpms and pull hard up to about 6000 rpms. Maybe there's more power down low now that masks the surge in power, but that hard lunge is more like a mild push.

Guess I'll be calling Cobb.
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Old 06-08-2006, 11:17 PM   #9
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do you live in a fairly hot environment? outside heat may be a factor as well. i know that my car feels kinda sluggish when it's hot and humid, but there are times when it get's pretty cool outside, especially at night and the car feels like it has a little more response and pop. that's the thing about shelf maps, the ECU sometimes is very finicky when it comes to real world conditions. if not, just get a TBE and reflash to stage 2, i'm sure you'll be happy with that.
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Old 06-09-2006, 12:54 AM   #10
Poppa smurf
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Quote:
Originally Posted by clamdip
try do a reset again and drive the car hard to let the ECU re-learn the boost curve. or if not, give cobb a call they'll know what to do.
I wish it was that simple, 9+ months now and I have tried switching maps, going back to stock, looking for exhaust leaks ETC.... ( I do travel alot, not in the car but I sometimes go a month without driving it) and still no go. Right now we're leaning to something happening only under load (hose etc..).
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Old 06-09-2006, 01:18 AM   #11
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Quote:
Originally Posted by Poppa smurf
I wish it was that simple, 9+ months now and I have tried switching maps, going back to stock, looking for exhaust leaks ETC.... ( I do travel alot, not in the car but I sometimes go a month without driving it) and still no go. Right now we're leaning to something happening only under load (hose etc..).
yeah, that's the thing with shelf maps. they don't work the same for every car. give cobb a call. they can help you troubleshoot as they did for me when i got my stage 2.5 VF30 map and i had some problems. we ended up troubleshooting to the brass restrictor pill and hose. problem fixed and it was all good from there. if you do talk to them, post up and maybe we can go from there. goodluck.
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Old 07-24-2006, 02:06 PM   #12
Kenthro
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This is a noob question, but maybe it'll help.

Should I hit full boost in each gear, or only in higher gears?

In 1-3rd, I can only hit about .07 MPa. In 4th, i can hit just above .1 MPa. Is this normal behavior?
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Old 07-24-2006, 02:17 PM   #13
Master2192
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You usually won't be able to hit full boost in 1st or 2nd gears, the engine accelerates faster than the turbo can spool. And in those gears there is less load on the engine (turbo's are load driven). You should be able to hit full boost in 3rd-final gear.

Kenthro, do you have a STI or a WRX?
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Old 07-24-2006, 11:36 PM   #14
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It's an 04 STi.

The reason I am asking is because I am contemplating going to the HWG map.
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Old 07-25-2006, 12:52 AM   #15
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Iím on HWG map stage 2, and i hit 1.0 bar in 3d and 4th.
I did adjust a waste gate arm 2 turns and boost did raise 0.1 bar, with no spikes so far.
I donít know any other ways how to fix the problem, also how to check for pipe leaks?

04 WRX stage 2 DP/UP No Cats
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