hollow engine noise at around 3K RPM

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03-03-2003, 12:18 PM

igorshos

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hollow engine noise at around 3K RPM

I noticed that the engine sound on my WRX'03 changes at around 2750 RPM, it becomes more "hollow". It goes away if I go above 3K or below 2.7K.

Should I be concerned or is it normal?

Thanks!

03-03-2003, 12:40 PM

BlingBlingBlue

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Join Date: Nov 2002

Location: Bay Area

Posts: 1,402

Car Info: 02 WRX wagon=dead; rollin' in a Craptastic Camry!

Just don't let the revs fall below 3K and you'll be a lot happier!LOL I haven't noticed this in my car...Maybe you can talk a local member into giving you a ride in their car to see if it makes the same noise?
I wouldn't worry about it unless it's accompanied by a loss of power...

03-03-2003, 01:05 PM

Cabal

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I know exactly what you're talking about, it takes place on mine when cruising steadily between 2700-3000 RPM. I wouldn't describe it as hollow, though, more just "mean." This is a characteristic of the boxer engine, and I think it's pretty damn cool. It's not that different from the normal sound at other RPMs, but I did find it noticeable when I first bought my car.

03-03-2003, 03:50 PM

igorshos

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I wonder why it is different just there... I actually find this noise rather annoying because I don't understand what's going on.

Can it have something to do with the turbo? It kicks in at the same RPMs, right?

Thanks!

03-03-2003, 03:59 PM

Cabal

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Doubt it, I don't have a turbo.

I remember reading an explanation for it either here or on www.nasioc.com , but I don't remember the rationale. www.howstuffworks.com has some good info on the workings of the boxer engine, but I don't think that had anything related to this particular issue.

Last edited by Cabal; 03-03-2003 at 04:01 PM.