Does your SI make this whistling/whining noise when accelerating?

Does your SI make this whining/whistling noise when accelerating?


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fretcrazy

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I also don't hear anything abnormal. I hear the turbo 'whine' as it spools up then the compressor winding down as you let off the throttle and the wastegate opens. Sounds like you still have the stock intake, yeah?
 
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davemarco

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I also don't hear anything abnormal. I hear the turbo 'whine' as it spools up then the compressor winding down as you let off the throttle and the wastegate opens. Sounds like you still have the stock intake, yeah?
Yep. I just took it to the dealer today, and they mentioned that this is the normal turbo sound. Not sure why it seems to have become more prominent in the last few months, but I'm satisfied with their explanation in the face of the the almost unanimous feedback on this forum.
 


10gCiViC

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The whine I hear is gear whine (they are 4.11:1's you know) unless I am not hearing something else...
 

fretcrazy

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The whine I hear is gear whine (they are 4.11:1's you know) unless I am not hearing something else...
I actually didn’t know the gearing size. Another reason I love this forum, always learning something new!
 

fretcrazy

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Yep. I just took it to the dealer today, and they mentioned that this is the normal turbo sound. Not sure why it seems to have become more prominent in the last few months, but I'm satisfied with their explanation in the face of the the almost unanimous feedback on this forum.
As engine breaks in and things settle it will start to sound more refined. If you add a CAI/SRI that ‘whine’ will change to turbo spool noise & you will be forever satisfied. It’s a damn symphony to my ears with the CAI :)
 
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davemarco

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As engine breaks in and things settle it will start to sound more refined. If you add a CAI/SRI that ‘whine’ will change to turbo spool noise & you will be forever satisfied. It’s a damn symphony to my ears with the CAI :)
Yeah, waiting on the PRL short ram. Was almost convinced to go with a CAI, until all of that northeast snow melted and every street in my area flooded. Not worth the risk.
 

10gCiViC

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I hear an occasional fast sounding whine when slowing my car down, sounds like a very fast paced futuristic sound. Tonight I heard it many times during stop and go traffic. My theory is some kind of pump to cool the turbo ? I know my old turbo'd car did this when I turned off the car.
 
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jmr

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Yes turbo spool is a good thing. I wish it was louder in 3rd and 4th gear as it sounds in 1st and 2nd.....louder is better. lol
 

HondadSi

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Hey guys! My 2018 civic si just started making a loud whistling or whining noise. Did anyone find out for sure what is was? Its a really annoying sound. I notice it in neutral, 1st, and 2nd when accelerating and decelerating.
 

X_Gen_Si

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Yes I hear it too in my 2018 si sedan.
And it's only when I have my AC on..
And it is annoying I have to put volume up so I will not hear that damn noise......
 

HondadSi

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Another thread post said it was a bad a.c. expansion valve
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