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| The Pub For General Automotive Related Talk |
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12-03-2006, 10:15 PM
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FF.Com.Au Hardcore
Join Date: Jul 2005
Location: Melbourne
Posts: 6,940
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I've always wanted to know why the exhaust sounds louder when you start the car in the morning. For example, when I start my BA XR8 in the morning you can hear it thump on idle like a V8 should. But drive it for 5 minutes when it reaches operating temp and it idles soft. Any explanations as to why this occurs??
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~~~~~~~~~~~~~~ Rides (past and present) Current: 2004 Ford Falcon 5.4L 3v Barra 220, Manual Past: Mitsubishi Sigma (m), Toyota Seca (m), Toyota Seca SX (m), Toyota Vienta V6 (m), Toyota Soarer 4L v8 (a), BA XR8 ute (m), T3 TE50 (m), BMW Z4 (m) AFF motto - If contrary views trigger, please use ignore button. 
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12-03-2006, 10:15 PM
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#2 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Pakenham, Victoria
Posts: 6,983
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Change in idle rpm??
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74 XB Fairmont (street car) 11.07@123.02mph. 08 LV Ford Focus XR5 (daily). Tuned by Hallam Performance |
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12-03-2006, 10:22 PM
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Banned
Join Date: Jan 2006
Location: Big concrete/cast iron jungle of the south
Posts: 346
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The engine isn't combusting fuel at peak efficiency so alot of unburnt fuel gets burnt off in headers.
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12-03-2006, 10:33 PM
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#4 | ||||
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AFF's 1st DM.......
Join Date: Dec 2004
Location: Wha???... There is only 2 states 2 be in.. WA or Drunk..
Posts: 6,200
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Quote:
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FORD GIVING POWER TO THE PEOPLE Alloy headed 347ci EDXR8 13.21 @107.7mph Quote:
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12-03-2006, 10:49 PM
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Has Blue Blood
Join Date: Feb 2005
Location: Brisbane
Posts: 1,551
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Quote:
What? Playing "BINGO" changes how loud my exhaust is ??? WOW. :nutsycuck
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Real cars dont wear bowties I'm not arrogent , Just superior
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12-03-2006, 11:18 PM
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#6 | |||
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Regular Member
Join Date: Jan 2005
Location: South Australia
Posts: 227
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Quote:
hehe sorry, you had to watch The Simpsons tonight ;)
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5 Speed EL Futura 140rwkw last dyno |
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13-03-2006, 08:20 AM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Working, chasing after my daughter and working
Posts: 3,407
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Its called auto choke in the pcm richening up the mixtures till it starts to warm up, let it sit idle for a few minutes and listen to the idle taper off when warming. Rember the old days with carby pull the choke out nice lumpy idle.
But yes they do sound good when cold quiet a solid idle. |
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Exhaust sounds louder on cold start ups...why?
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