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I have a 2008 WRX with the stock TD04 turbo.

I cannot hear any spool up as one would usually expect with a turbocharged vehicle.

Yet i have used an ODBII bluetooth device and torque for android to confirm that ECU see's a change in vacuum / boost.

Is this normal or is there likely a problem.

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  • Hmm just found this which suggests it might be normal, clubwrx.net/forums/engine-modifications/…, Would still like an answer from someone who knows their stuff.
    – Aaron Tate
    Commented Aug 15, 2017 at 3:09
  • Were you able to hear it spool up before, and now you can't? Or is this just something you noticed compared to other cars?
    – CharlieRB
    Commented Aug 15, 2017 at 11:42

3 Answers 3

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I've owned three different turbocharged Imprezas and can confirm that it's perfectly normal not to hear the turbo spooling up. In fact on a standard WRX if you can hear the turbo spooling that would normally indicate a problem!

If the Torque app is showing the right level of boost then you've got nothing to worry about.

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Is there any lag getting boost - if not then the turbo is already up to speed. Designs have changed from the early ones and market forces forced a move away from the boy-racer image requiring the power without the noise....

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My 2006 Jeep Liberty CRD with the factory Garrett turbo is not audible until it hits about 10 inches, and my hearing is tested to be acute.

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