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  1. #1
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    Is this wastegate rattle?

    I just started hearing this noise, any ideas?


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    thats just the Direct Injection. Sounds normal to me

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    thats just the Direct Injection. Sounds normal to me
    Ok, thats good to hear. Im about to install abunch of parts and i dont want to have to take them off. Any knowledge as to why I hear the police siren when my engine isnt warm? It started about a week after installing DCI.

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    DCI is known to let you hear the turbo's spooling. just take it easy on the boost until the car is warmed up

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    that noise is very common in the n54Click here to enlarge
    [SIGPIC][/SIGPIC]

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    Thanks everyone, Im glad I joined this forum e90post was getting boring.

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    Click here to enlarge Originally Posted by Gbreee90 Click here to enlarge
    Thanks everyone, Im glad I joined this forum e90post was getting boring.
    Welcome, one thing we aren't is "boring."

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    DCI is known to let you hear the turbo's spooling. just take it easy on the boost until the car is warmed up
    I know how turbo spool sounds like, but I have had this too (at least a year now) and when the engine is cold and the car is revving from about 500 to 2000 rpms there is a faint whistle noise. It seems to go away when the engine is warm though. I am almost certain it's not turbo spool though. I think that's what he is referring to at least... any thought?
    Click here to enlarge
    Current:
    2010 CTS-V Sedan

    Previous:
    2007 e92 335i

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    its still the turbo spool, its just more pronounced whe its still cold

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    its still the turbo spool, its just more pronounced whe its still cold

    +1

  11. #11
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    You have to realize that the stock turbos are journal bearing and are supported from rubbing only by a thin coat of oil. When the oil is cold you will have more internal friction and pressure which is probably causing the noise. Try to spin turbos as little as possible when the oil is cold.

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