Ver Important Exhaust Question

[2000chevysilv]

ok i put a flowmaster 40 series on my 2000 4.3 silverado.

 

 

sounds great.

 

I was told today that i should get rid of it, because its making my MPG worse cause its taking resistance out of the engine to create more power.

 

I dont know what to do, is this true??

 

 

I have never heard this before

 

the man told me that i would have to change my injectors, this guy does know what hes talkin bout hes a drag racer

 

 

HELP!!

[thecraft]

He is full of

[66nova]

He is full of

 

 

+1

 

 

Your friend doesn't win at drag racing very much does he.

 

 

 

 

 

I'm just messing with you. But seriously, your friend is mistaken.

[Mark_in_Tulsa]

Assuming you have a 5.3 or 4.8.

 

In the engine design of these, they have a fairly large valve overlap. (don't have time to explain it google it) So you do need some back pressure in the exhaust. If it flows to fast then there isn't enough velocity coming out of it.

 

Anyways, the point is running no muffler is bad, it will actually hurt performance. But you can actually gain a little bit of power going to a slightly more free flowing muffler. Which is pretty much any performance muffler.

 

But Flowmasters are probably on the bottom end of the performance scale. I've heard to often they hurt power, because to get that sound they have to use baffles, which actually restrict airflow. It may depend on the series of muffler it is also. But the joke is that Flowmasters don't actually flow.

 

Yeah you will hear people say they can feel their truck is faster with a Flowmaster, but I have seen to many actual numbers that show other wise.

 

I'm not sure what changing the injectors would do to help it?

 

 

In short you didn't hurt anything, and you like the sound. So be happy. But you could of picked something better for performance but you may not of liked the sound.

 

EDIT

 

Well since I assumed. I was wrong. Didn't realize you said you had a v6. I don't know enough about those. So ignore what I said.

[DofD]

Your friend is falsely informed. While your engine needs some back pressure in the exhaust system to operate at it's proper efficiency, your Flowmaster isn't going to reduce the back pressure significantly enough to do what your friend suggests.