the muffler and exhaust mod thread

[Ladogaboy]

Originally Posted by mcrews

yeah, its a fart can!!!! lmao

Heh. Sounds that way in the video... pretty sure that's the mic, though. My car sounds louder and deeper than that, and I'm bone stock.

[mcrews]

ok, here's mine.
Removed the resonator that was at the 'y' after the cats and installed an 'x' pipe.
Then removed the rear 40lb suitcase muffler and put twin glass packs.

[Ladogaboy]

Nice.

[trying to stay on topic]

My stock muffler weighs ~ 45 lbs. I'm not sure how that compares to most stock mufflers, but I can save a significant amount of weight (20 to 30 lbs) just by switching to an aftermarket muffler. The weight gain would probably only help city mileage.

The other thing that I've been looking at (I don't know if others have actually dealt with this) is that switching to a different rear exhaust might make cleaning up the aerodynamics of my rear a bit easier.

[Diesel_Dave]

Originally Posted by Ladogaboy

Doing so allows you to get 100% more power than you would get out of a naturally aspirated engine with the same displacement. From a mileage and efficiency perspective, it's very bad. As serialk11r stated, the excess fuel is used to cool the ignition chamber internally. Are there better ways of doing so? Yeah, probably. But this is the route most auto manufacturers have chosen for forced-induction engines.

But regardless, you are right. There is quite a bit of excess fuel that goes unburned. The cat is basically the only thing that prevents the car from shooting a fireball out the tailpipe.

Okay, gotcha. I did realize that the excess fuel would improve the volumetric efficiency and give increased power. I'm still a little suprised that the catlytic converter can take care of that much HC & CO, but I guess I was wrong.

[Ladogaboy]

With stock tuning, I have no idea what the actual lifespan of the cat is. It's 5 years before these cars are required to be smogged, but my guess is, the cat would probably have to be fully replaced by that point.

[viio]

To go back a little to the AFR question, here's the fuelling graph from my Impreza before it was remapped. At peak power it's AFR is around 11:1, however this isn't its final state of tune. Try to ignore the ridiculous power curve

[mcrews]

Originally Posted by viio

To go back a little to the AFR question, here's the fuelling graph from my Impreza before it was remapped. At peak power it's AFR is around 11:1, however this isn't its final state of tune.



Try to ignore the ridiculous power curve

I'm tryin.....really......I am........

[viio]

Needless to say, its NOT ecomodded

[California98Civic]

In the OP I dismissed the Thrush Turbo as a fart can, then I continued looking and eventually found someone who insists it sounds a lot like stock and does not attract police attention like other mufflers. I think the fart can effect heard in the vid in post #1 might be because of a tip. The cheaper price of the Thrush remains attractive for an experiment.

For the hell of it, for the cheap of it, and for my general weight reduction project, I'm thinking I'll get the Thrush, compare its weight to stock, install it, post my own sound video, and compare its life span with the several stock mufflers this car has gone through over the last decade. Cheap initial cost and modestly lighter weight are the only savings/FE goals. And additional benefit might be that it has a smaller diameter and might integrate better into a underbelly pan project for the rear of the car.

[niky]

If this is the Turbo:



Then it should sound quite similar to stock, since the air goes through two to three direction changes inside.