can anyone explain this?
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Senior User
Joined: Jun 2003
Posts: 112
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can anyone explain this?
have a 2002 f150 4.6 liter triton short box reg cab
my exhaust is true duals 4 cats no glasspacks no mufflers wiht 4 inch tips
the first 30 seconds i drive it, its rappier then any chevy with a 350 in it but after it gets warmed up, it gets quieter and doesnt rap at all.
is there somethign wrong with my truck?
my exhaust is true duals 4 cats no glasspacks no mufflers wiht 4 inch tips
the first 30 seconds i drive it, its rappier then any chevy with a 350 in it but after it gets warmed up, it gets quieter and doesnt rap at all.
is there somethign wrong with my truck?
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
As the engine warms, so does the exhaust gases. The hotter gasses move faster and take longer to cool. The sonic reversion your hear (raspy) gets moved back farther and farther in the tailpipe to the point where it is eliminated.
If you want to keep the rasy note, just shorten your pipes.
(Disclaimer: This is a VERY simple explaination.
)
If you want to keep the rasy note, just shorten your pipes.
(Disclaimer: This is a VERY simple explaination.
)
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Also, it is running richer when cold (more fuel) when it warms up, the computer goed into the closed loop mode and leans things out. This is the main reason that it sounds different when cold.
