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Air Swooshing Sounds Between Shifts - Normal?


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It was a sunny weekend, and while I was on a spirited drive, I decided to lower the windows and pitch open the roof panel. This allowed me maximum audio input from my engine and exhaust :-) Question, I don't think I've ever noticed it before, but between shifts (while driving hard), I hear an air "swoosh" sound. It's quite audible, and sounds almost like a blow-off (dump) valve, only the tone is more muffled. But the thing is -- I don't have a BOV system installed in the car. Also, it's not audible when I shut the windows and roof. Is this normal? Or so I have a leak somewhere?

Also, with the windows and roof panel open, I can hear air being sucked into the quarter panel/window cowling for the intake, during hard acceleration -- I assume this is normal, no?

The combination of the sounds is intoxicating, and quite awesome. But I just want to make sure that none of it is a sign of damage/malfunction.

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That sounds like the wastegate, and the sucking noise is exactly that, your car is thirsty for more air thanks to the turbos :P

Lovely sounds :P

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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Yup. Fine.

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Will,

The noise you are hearing is absolutely normal. With stock air filters it will be hardly noticable, but with a K&N or similar you can hear it quite well.

This noise is produced by the turbo-compressor-wheels itself. When you quickly close the intake butterflies the turbos keep on spinning and there is a backwave produced which hits the vanes and produces this kind of noise.

Cheers

Marcus

www.PUKesprit.de

It was a sunny weekend, and while I was on a spirited drive, I decided to lower the windows and pitch open the roof panel. This allowed me maximum audio input from my engine and exhaust :-) Question, I don't think I've ever noticed it before, but between shifts (while driving hard), I hear an air "swoosh" sound. It's quite audible, and sounds almost like a blow-off (dump) valve, only the tone is more muffled. But the thing is -- I don't have a BOV system installed in the car. Also, it's not audible when I shut the windows and roof. Is this normal? Or so I have a leak somewhere?

Also, with the windows and roof panel open, I can hear air being sucked into the quarter panel/window cowling for the intake, during hard acceleration -- I assume this is normal, no?

The combination of the sounds is intoxicating, and quite awesome. But I just want to make sure that none of it is a sign of damage/malfunction.

Marcus

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Ah ha! More the reason to upgrade to the K&N filters while entertaining a pair of Hyper-Flow cats. Thanks, Marcus!

-Will

Will,

The noise you are hearing is absolutely normal. With stock air filters it will be hardly noticable, but with a K&N or similar you can hear it quite well.

This noise is produced by the turbo-compressor-wheels itself. When you quickly close the intake butterflies the turbos keep on spinning and there is a backwave produced which hits the vanes and produces this kind of noise.

Cheers

Marcus

www.PUKesprit.de

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Ah ha! More the reason to upgrade to the K&N filters while entertaining a pair of Hyper-Flow cats. Thanks, Marcus!

-Will

And what a sexy sound it is....... About the K&N, I heard that the oils can gum up the mass air flow senser. Is that a problem on the V8?

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The Esprit uses a map sensor, so you have nothing to worry about :lol:

And what a sexy sound it is....... About the K&N, I heard that the oils can gum up the mass air flow senser. Is that a problem on the V8?

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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