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Too big to fail
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Strange noise @WOT
I've noticed on the few occasions that I got WOT for
more than a second or two, I get this strange hissing/whooshing noise from the back. It's loud enough to make itself known over the B&B exhaust! Imagine a big american car with carbs running without an air cleaner; you know that 'hiss' they make when they throttle up? Kinda like that, but louder. I have a vaccum bottle set up to supply the secondary plenum (964 engine) and I'm thinking maybe I'm exhausting that and causing a leak? Either that, or when you get a huge amount of airflow, and a large K&N, you can get a noise like this? This only happens when I stand on it for a few seconds at a time.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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01-25-2002, 08:46 PM
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Registered
Join Date: Nov 2000
Location: AZ
Posts: 8,414
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If it's more of a "whooshing" sound, my money would be on the K&N. If you still have your stock airbox laying around, you might want to through it on and see if the noise goes away.
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01-26-2002, 12:16 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Aha! Noticed that you have a 3.6 in that thing. What you are hearing is the resonance valve (i think that's what it's called) opening up via vacuum at 6000 rpm.I
It's kind of the pre-cursor to varioram. My C2 does the same thing. I have a drilled airbox, so you can really hear it when you keep your foot in it. I just love it!
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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01-26-2002, 11:58 PM
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