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Old 06-24-2012, 02:22 AM   #1
realwomble
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Join Date: Nov 2003
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Location: Seattle, WA
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2002 Stg.2 WRX Wagon
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Default 02 WRX, AP V1 stage 2, bad over/underboosting (Bill?)

Bill,

(this is a continuation of the problem I posted in the APv2 beta maps thread here)

Finally had time to gather new data, including 3rd gear pull with A/F learnings.

Posting the log text isn't very readable - if you need to see the full logs let me know and I'll email them or the excel sheet.

#1 below

Driving the same route as last time (flat, freeway), 3rd gear pull, and beginning of 4th (uphill, not shown here).

Both look stable, although underboosting by about 2psi. Interestingly my IAM has worked up to 15 since last week when it was 9 - temps here have been 10-15F cooler (today about 60F?) if that may be a factor.

#2 below

Exited, turned and came back downhill, did a 2nd on the on-ramp (downhill) which showed massive overboost (20psi before I let off!),

#3 below

Right after, third gear (downhill), which overboosted to 18.5psi, then quickly bounced down to ~8psi and stayed there, even though WG duty climbed up to 78%?

#4 below

Right after, 4th gear (downhill), shows same behavior as last week (uphill) - overboost to 19psi before I let off.

I'm a bit worried about my engine at this point with this level of overboost.... any ideas what the problem might be? WG solenoid? Boost control logic? Or consistency that v2 logic might fix?

Thanks in advance for any help here,
Tom

AP V1, newest Stg2 91 base map (on 92 oct WA gas), Cobb catted DP, silicone IC hoses, STI UP. 67K on the car, stage 2 since about 2005.

(#1) 3rd gear pull, stable, underboosting a bit



(#2) 2nd gear overboost to 20psi



(#3) Third gear, spike to 16psi drops back to ~8



(#4) 4th gear, overboost to 19 before let off



Chart of the 2nd/3rd/4th runs above

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Last edited by realwomble; 06-24-2012 at 02:32 AM.
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Old 06-24-2012, 09:33 AM   #2
Cobb Tuning
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Try reflashing the economy mode map. This will disable boost control - would be interesting to see if you still have the boost spikes with wastegate duty fixed at zero.

It definitely appears that you have a mechanical issue would could be anything related to the wastegate -> wastegate solenoid, lines, flapper, wrong pill, etc.

Your A/F Learning looks fine, but this would depend on how long it has been since you last reflashed a map (or installed AP), reset the ECU, or disconnected the car's battery. When you go back to one of the performance maps, I would go ahead and reflash the 91ACN map which is our most conservative map.

Bill
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Old 06-24-2012, 02:44 PM   #3
realwomble
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Join Date: Nov 2003
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Location: Seattle, WA
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2002 Stg.2 WRX Wagon
Silver

Default

Battery hasn't been disconnected for months, and haven't flashed or changed maps for years.

Pill is there (I assume - owned the car since new and never messed with it).

Side note - don't have a WBo2, but EGTs look fine (probe in usual place in collector/manifold), nothing much over 1450.

I tried the economy map (realtime) today
  • typical boost observed (from log) at WOT was typically 7-8psi,
  • It generally looked stable with no oscillation with around 1.5 psi variation within any particular WOT section.
  • However around 4000RPM in 4th, it would initally rise to 9 and in one case 10 @ about 60-75% throttle point, before falling back down to 7-8 @ 100% throttle. (see below)

Any red flags here?

Is the MAF spike at partial throttle normal?

Any suggestion where to start first mechanically?

Thanks,
Tom

4th gear, economy RT map on stg 2 91 base.




Last edited by realwomble; 06-25-2012 at 02:08 AM.
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Old 06-25-2012, 08:51 AM   #4
Cobb Tuning
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This isn't an issue with the ECU or tune - definitely appears to be a mechanical issue. I would look for split/cracked/damaged wastegate lines first. Check the back side that you can't see from the top as well. If you can find an experienced Subaru tuning shop that is willing to do this kind of diagnosis, I would take it there and have them give it a once-over.

Bill
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Old 06-25-2012, 12:49 PM   #5
realwomble
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Location: Seattle, WA
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2002 Stg.2 WRX Wagon
Silver

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Will do, thanks.
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