Exhaust Louder At Cold Start
Thread Starter
Burning Brakes
Joined: Feb 2012
Posts: 760
Likes: 22
From: Slatington PA
Exhaust Louder At Cold Start
2002 Z06.
Stock engine.
ARH LT's, Catted X pipe, B&B Bullets.
Why is the exhaust louder on a cold start? I stand behind the car and it seems that the exhaust quiets down after everything is warm.
Am I just imaging this or is there a reason for this?
Stock engine.
ARH LT's, Catted X pipe, B&B Bullets.
Why is the exhaust louder on a cold start? I stand behind the car and it seems that the exhaust quiets down after everything is warm.
Am I just imaging this or is there a reason for this?
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Cars are always louder on cold start. Not sure why but I'm guessing it's emissions related. Your cats don't work when they're cold so there's probably a provision to lean out the air/fuel mix or retard the timing to heat them up as quickly as possible. I also think I've seen my C5 run at higher idle when very cold.
Thread Starter
Burning Brakes
Joined: Feb 2012
Posts: 760
Likes: 22
From: Slatington PA
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Drifting
Joined: Feb 2010
Posts: 1,720
Likes: 38
From: Colorado
ron got it before i could. your o2 sensors dont start to change the tune til they're warmed up and in closed loop. i forget what temp that is.. but a fresh start is always richer = louder. before tuning my car with the headers it was so loud that people even commented on "did you change your exhaust out?" afterwards.
