flowmaster super 40... FE impact?

[ConnClark]

Here is a research project that shows how a good low back pressure muffler can improve things at a low rpm and variable load. The engine its tested on is a 16hp 2 cylinder diesel so results may vary slightly for a gas engine.

http://www.ripublication.com/aama/aamav2n1_4.pdf

[Christ]

I think I read that correctly... it's essentially saying that with the new (quieter) muffler, they got less fuel consumption and higher thermal efficiency... is that correct?

So what does that say about flow? Was the new muffler quieter with higher flow?

Also, back on the original tract of the discussion, SuperTrapp mufflers claim increased flow and HP across the board... which should mean higher efficiency due to lowered pumping losses, regardless of throttle position or RPM.

How does that conclude to "adding a muffler can't increase your fuel economy"?

[Tygen1]

My two cents....
2.0 motor, I put on a Tuned 4-2-1 header, no cat, 2.25 mandrel bent pipe to the back of the car with a straight thru resonator and a staight thru muffler. I recieved a small but noticable increase in mpg's while driving with load. I also recieved a very large and prominate rise in peak hp, 1.2 seconds quicker thru the quarter mile. The torque at low rpms has increased noticably also, however I am not able to take advantage of pulling lower rpms at slower speeds because of the ATX trans down shifts for me......at least not yet
At idle the if you put your hand over the muffler outlet before and after this work the pressure of the gas coming out is much higher after, ie. it feels like it is pushing against my hand much harder.

Hope this helps.

[aerohead]

Stick with OEM.All SEMA aftermarket muffler manufacturers along with cast and crew of Fast and the Furious have been convicted of crimes against humanity,and have been conscripted into the Army as infantry "point men".They will be permanently stationed in Iraq and Afganistan and will be air-dropped,naked,with no basic training,armed only with a pea-shooter.-------Their products will be confiscated by the Alien Property Custodian and destroyed in a public exhibition during Burning-Man.-------- Vin Diesel plead for his life but was the first to be taken.-------- SEMA has apologized for the damage they've caused and vows not to resist the seizure and destruction of their assets.

[93Cobra#2771]

it's all about how restrictive your current system is. On mustangs up until 2005, replacing the stick cat back system with a mandrel bent system and good free flowing mufflers was not only worth 5-15 up, but also gained a nice bit if low end torque to boot.

05 and up stangs have a much more efficient exhaust system stock, this making an upgrade useless.

My advice is to find a forum dedicated to your particular car and do some research. FYI a straight flow through muffler is the most efficient type.

[Domman56]

Flowmaster 40 with a turndown helped increase FE on my buddy's GMC sierra 4.3

[Frank Lee]

Obviously I must run out and buy a Flowmaster 40 with a turndown now.

[Christ]

Originally Posted by Frank Lee

Obviously I must run out and buy a Flowmaster 40 with a turndown now.

This post will cost you a quarter. Feed's getting pricey these days.

[MadisonMPG]

Originally Posted by Christ

This post will cost you a quarter. Feed's getting pricey these days.

we need more icons.

[Christ]

It's less obvious this way.