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Interesting Noise on Full-Boost
I posted this in the Turbo forum, but the traffic in that forum just isn't as heavy as it is here...
I have noticed, specifically when it's cooler out, that when I go full-trottle and the turbo builds full boost, I hear a momentary, slight whining sound, which seems to correspond to the turbo building boost. Any ideas what this might be? It doesn't seem to be a problem, because the car is running great, but is it anything I should be concerned about? there also seems to be either a something loose in the exhaust (or a loose heat shield), because I hear a rattling from the general mid-exhaust area (somewhere near the cat) at about 1200rpm If it helps, my car seems to make the "interesting sound" with more weight in the car. For example, after I dropped off my bro tonight (230lbs), I noticed that the sound didn't seem to be occurring as often. The noise sounds like how a chair squeaks when you pull it out on a hardwood floor sometimes
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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10-10-2006, 04:01 PM
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Registered
Join Date: Jan 2003
Location: NJ shore
Posts: 138
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Check to see if there is a wooden chair wedged under your car.
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Red 1967 Saab "96", needs help Blue 2002 Pathfinder SE 1991 240SX-SE, auto, trans was shot - junked it |
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10-10-2006, 04:05 PM
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Oh hohoho what a comedian
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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10-10-2006, 04:08 PM
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Join Date: Apr 2005
Location: Ontario, Canada
Posts: 4,554
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heat shield probably.. just rips off with a pry bar. i did it to mine, rattling sound gone.
boost sound, no idea.
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Kyle 2008 Mini Cooper // '83 Porsche 944 // '01 Mazda Protege [sold] // "Never break more than you fix!" - SoCal Driver |
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10-10-2006, 04:14 PM
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Join Date: Aug 2000
Location: Calgary, Alberta, Canada
Posts: 523
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Hmmm...Your "whining sound" could be a pile of things but I would suspect a vacuum leak...especially if the vacuum lines are original. For that matter you should seriously think about replacing all the rubber lines including fuel, vacumm and cooling.
The rattling is possibly a loose heatshield on the exhaust manifold. The welds break loose over time and can make that annoying sound.
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'86 951 '88 928S4 - the project |
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10-10-2006, 04:15 PM
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Join Date: Jan 2003
Location: Idaho Falls, ID
Posts: 1,199
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CJ,
The whining sound may be normal. The turbo should make a whining/spooling sound on accel and decel, this is normal. The added weight of your bro' would simply increase the boost in lower gears. The sound you are hearing is probably a good thing, I would be more concerned if you couldn't hear the turbo spool.
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75 914 - Undecided. 80 931 - Gone, but not forgotten. 72 914 - old toy- sold. And a whole bunch of German scrap metal shaped like 924's. Old enough to know better, and stupid enough to do it anyway! |
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10-10-2006, 07:51 PM
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No, i hear the whistling/hissing of the turbo spooling up, this is an additional sound that only occurs when i put the pedal to the floor
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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10-11-2006, 05:57 AM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
