boost low since 87 fill up
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This is a discussion on boost low since 87 fill up within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; let the old lady take the car and she filled it up with 87 even after I told her it ...

  1. #1
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    boost low since 87 fill up

    let the old lady take the car and she filled it up with 87 even after I told her it takes PREMIUM! well during that tank and after the boost will only go to about .75 bar. used to always go up to 1 bar. did the computer detune for the lower octane?

    car is completely stock but with cai. 2002 wagon.

    thanks for any help.
    2002 wagon stock auto

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    Registered User wrx wagone's Avatar
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    Quote Originally Posted by 41922 View Post
    did the computer detune for the lower octane?
    Yes, it probably cut boost and timing.
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    I just bought a second hand WRX and believe the original owner was using 87 regularly. I don't have a boost gauge so I'm not sure what boost I'm hitting. I've been using Premium now (91 octane) since I've had it for 2 weeks.

    Should I reset the ECU by disconnecting the neg battery terminal?

  5. #4
    The Default One SeattleJeremy's Avatar
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    Quote Originally Posted by 41922 View Post
    let the old lady take the car and she filled it up with 87 even after I told her it takes PREMIUM! well during that tank and after the boost will only go to about .75 bar. used to always go up to 1 bar. did the computer detune for the lower octane?

    car is completely stock but with cai. 2002 wagon.

    thanks for any help.
    The Knock sensor can only do so much, try not to overwork it, and stay out of boost as much as possible.

    Quote Originally Posted by baumer View Post
    Should I reset the ECU by disconnecting the neg battery terminal?
    Resting the ECU couldn't hurt, give it a try.

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    Registered User tayhadar1's Avatar
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    Quote Originally Posted by baumer View Post
    I just bought a second hand WRX and believe the original owner was using 87 regularly.
    WHat

    I would have been a little scared to buy that. Do an ECU reset and hope that is the only problem.
    2004 WRX Sti Cobb Stage 2
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    Administrator TheJ's Avatar
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by 41922 View Post
    let the old lady take the car and she filled it up with 87 even after I told her it takes PREMIUM! well during that tank and after the boost will only go to about .75 bar. used to always go up to 1 bar. did the computer detune for the lower octane?
    I would hope so.

    car is completely stock but with cai. 2002 wagon.
    I wonder if you are running lean with the intake.

    It is expected that the car will reduce timing but I've not seen another thread with numbers listed where the car cuts boost. Nice system really. If what we think is going on is true the car will eventually advance timing and increase boost as the fuel improves.
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