03 wrx loosing power at about 5k rpms
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This is a discussion on 03 wrx loosing power at about 5k rpms within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 03 wrx and its loosing power at about 5000rpms, it is pro tuned to run at 18psi ...

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    03 wrx loosing power at about 5k rpms

    I have a 03 wrx and its loosing power at about 5000rpms, it is pro tuned to run at 18psi and no recent add ons. Just one day i floor it and it kicks in like normal and then the boost almost falls off the chart and it doesnt accelerate anymore. Also seem to be getting some shudder but the wastegate is tightened down "enough". should i tighten it down more?

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    Moderator Donkey's Avatar
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    Quote Originally Posted by krrawn View Post
    I have a 03 wrx and its loosing power at about 5000rpms, it is pro tuned to run at 18psi and no recent add ons. Just one day i floor it and it kicks in like normal and then the boost almost falls off the chart and it doesnt accelerate anymore. Also seem to be getting some shudder but the wastegate is tightened down "enough". should i tighten it down more?
    List all your mods and when the problem started happening.Any CEL/DTC?Don't touch the wastegate actuator unless you know what your doing.You will just end up creating another problem possibly.When was it tuned?
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    short ram intake,
    e-cutout exaust (open header)
    walbro 255lph
    turboxs tmic
    act heavy duty street disk

    and it was tuned about 2 months ago
    This only started happening about 3-4 days ago and i lied i did just have a act heavy duty street disk put in about a week ago. it is not throwing in codes.
    Last edited by krrawn; 12-28-2008 at 09:55 AM.

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    Moderator Donkey's Avatar
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    Try checking your TMIC couplings at the turbo and throttlebody.You might have a boost leak due to a loose coupling.I would imagine the TMIC would have had to be removed to install/replace the clutch.Thats all that I can think of unless they did a crapy job reinstalling the flywheel after resurfacing and it is out of balance or loose.
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    Registered User teflon_jones's Avatar
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    Quote Originally Posted by krrawn View Post
    short ram intake,
    e-cutout exaust (open header)
    walbro 255lph
    turboxs tmic
    act heavy duty street disk
    That is a really odd choice for mods to this car. Why did you do the fuel pump and clutch? What exactly is the exhaust mod?
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
    '04 Porsche 911 Turbo GT2 clone 600 HP/TQ
    '77 F-150 heavily modded for off-roading

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    The clutch was burnt out and a friend of mine sugested the pump for extra low end power. I did just check the tmic and it looks like the part that the vac line goes on is bent. Could that be causing a leak? Maybe that's my problem. I've also heard the boost controllers fail alot maybe that?

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    Just currious what mods do you recomend for this car?

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