sti underboost
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This is a discussion on sti underboost within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so i just got an AP for my 04 sti with 100,000 miles. and aparently i'm only getting about 10 ...

  1. #1
    Registered User ModernRevolution's Avatar
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    sti underboost

    so i just got an AP for my 04 sti with 100,000 miles. and aparently i'm only getting about 10 psi from my turbo.
    my car is almost as fast as my brother's protuned stage 2 07 wrx that does 17.5-18 psi. so i'm wondering if the AP is reading wrong or is my car really supposed to be that much faster still? i have an exhaust leak between my downpipe and my cat back...the cat back is the only performance mod. car just got new plugs, serpentine belts, timing belt, pulleys, and water pump.
    any thoughts?

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  3. #2
    Master Baiter EJ257's Avatar
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    Since you mention the AP, I'm assuming that's where you're reading boost level?

    Is the solenoid working properly?
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

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  4. #3
    Registered User ModernRevolution's Avatar
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    car seems super fast and responsive even though it only reads 10 psi ( yes, reading off the AP. i don't understand that weird little boost gauge that comes with car)... but i've only driven WRX's and Legacy GTs, so i don't have another sti to compare power to. wastegate opens to at least 70%. only had the AP in sinse last night. what solenoid? how to check?

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    Admiral Ackbar mycologist's Avatar
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    Your AP is accurate in that it is reading what the ECU sees. Log or read RPM, throttle position, DAM, dynamic knock correction, learned knock correction, A/F correction #1, TD boost error, WGDC, boost psi, calculated load, MAF v. Delete the non-WOT portions, upload to google docs, make public, and post the link. Don't log any additional stuff, it slows down the readings and it isn't useful.

    You can use 3rd gear for now:
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  6. #5
    Moderator Donkey's Avatar
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    If this is your first time ever taking boost readings my thought would be either your missing the restrictor pill or the ECU was just reset. FYI-when you reflash the ECU it temporarily resets the IAM a default of 1/2 of what it is supposed to be. This will also temporarily lower boost to wastegate pressure until the IAM comes back up.
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