|
|
|
|
|
|
Welcome to the Australian Ford Forums forum. You are currently viewing our boards as a guest which gives you limited access to view most discussions and inserts advertising. By joining our free community you will have access to post topics, communicate privately with other members, respond to polls, upload content and access many other special features without post based advertising banners. Registration is simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact us. Please Note: All new registrations go through a manual approval queue to keep spammers out. This is checked twice each day so there will be a delay before your registration is activated. |
|
|||||||
| The Pub For General Automotive Related Talk |
 |
|
|
Thread Tools | Display Modes |
12-03-2006, 11:15 PM
|
#1 | ||
|
FF.Com.Au Hardcore
Join Date: Jul 2005
Location: Melbourne
Posts: 6,883
|
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??
__________________
~~~~~~~~~~~~~~ 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. 
|
||
|
|
|
12-03-2006, 11:15 PM
|
#2 | ||
|
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Pakenham, Victoria
Posts: 6,983
|
Change in idle rpm??
__________________
74 XB Fairmont (street car) 11.07@123.02mph. 08 LV Ford Focus XR5 (daily). Tuned by Hallam Performance |
||
|
|
|
|
12-03-2006, 11:22 PM
|
#3 | ||
|
Banned
Join Date: Jan 2006
Location: Big concrete/cast iron jungle of the south
Posts: 346
|
The engine isn't combusting fuel at peak efficiency so alot of unburnt fuel gets burnt off in headers.
|
||
|
|
|
|
12-03-2006, 11:33 PM
|
#4 | ||||
|
AFF's 1st DM.......
Join Date: Dec 2004
Location: Wha???... There is only 2 states 2 be in.. WA or Drunk..
Posts: 6,200
|
Quote:
__________________
FORD GIVING POWER TO THE PEOPLE Alloy headed 347ci EDXR8 13.21 @107.7mph Quote:
 :
|
||||
|
|
|
|
12-03-2006, 11:49 PM
|
#5 | |||
|
Has Blue Blood
Join Date: Feb 2005
Location: Brisbane
Posts: 1,551
|
Quote:
What? Playing "BINGO" changes how loud my exhaust is ??? WOW. :nutsycuck
__________________
Real cars dont wear bowties I'm not arrogent , Just superior
|
|||
|
|
|
|
13-03-2006, 12:18 AM
|
#6 | |||
|
Regular Member
Join Date: Jan 2005
Location: South Australia
Posts: 227
|
Quote:
hehe sorry, you had to watch The Simpsons tonight ;)
__________________
5 Speed EL Futura 140rwkw last dyno |
|||
|
|
|
|
13-03-2006, 09:20 AM
|
#7 | ||
|
FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Working, chasing after my daughter and working
Posts: 3,407
|
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. |
||
|
|
|
Exhaust sounds louder on cold start ups...why?
Linear Mode
