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Registered
Join Date: May 2004
Location: New Hampshire
Posts: 6,153
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Turbo "chirp" when shifting
 What is the "chirp" "chirp" noise I hear when some turbo cars shift gears? Why don't I hear this with the 930 when they are shifted, is it because the pop valve is not vented to atmosphere? Thanks. Len OOPS, wrong forum. Sorry guys, this should be in the Turbo forum. Mr Moderator, can you move this please? Len 
Last edited by BoxsterGT; 09-03-2007 at 02:50 PM.. Reason: Wrong forum |
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09-03-2007, 02:44 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,341
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You'd be surpised, I suspect you'll get an answer from here just as fast. There are lots of turbo folks around.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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09-03-2007, 02:53 PM
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you've probably got a bird joyriding on your antenna yelling F**K YEAH! everytime you shift
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78 911 SC "Scratchy" 2004 Mini Cooper S "Pele" (gone but not forgotten) 1979 classic mini clubman-"Coolio" |
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09-03-2007, 03:03 PM
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Sultan of Sawzall
Join Date: Oct 2004
Location: Louisiana "Take me to 'da bridge"
Posts: 4,806
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You're hearing the BOV (blow-off valve). The BOV on our Infiniti's supercharger is a dead give-away.
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Gruppe B #319 2 '86 911 Carrera coupes (red & white) '66 Corsa convertible 140/4(red) '66 Monza coupe 110/PG(white) '95 993 cabriolet (wife's) |
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09-03-2007, 03:16 PM
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Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
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930's re-circulate the air back into the intake. Thus it does not go into the automsphere and make the noise.
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John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
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09-03-2007, 10:28 PM
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Coolio
Scratchy
Scratchy
Scratchy
Scratchy
Scratchy
