| SilverFire |
| I've been poking around the forum over at rx7club.com and it seems that a single 2.5" exhaust is a really popular mod. Seeing as how this is what I have on my N/A FC, I"m wondering if there's a performance reason for it or if it's just a budget thing. I guess it would be cheaper to do should you need a new exhaust system, but why bother otherwise? Duals would look cooler, sound cooler, and flow freer too, wouldn't they? |
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| REFLUX |
Typically, NA cars need some backpressure to retain midrange power/torque.
So by having 2 exhaust outlets eventually combine into 1 tube, you get some backpressure.
Having true duals (1 muffler for 1 exhaust port) is mainly reserved for high rpm power, you lose mid/low range power.
Having dual mufflers but a Ypipe (single pipe split into two) would be more for looks than performance as it is heavier but prbly gives similar amount of flow as a single collected exhaust.
Having a single exhaust can also be a weight reduction thing.
From what I've observed, FC owners are usually more performance oriented than looks oriented.
So having an exhaust for a better sound or better looks might not be their top priority.
But of course, some ppl think a single exhaust looks better than dual. |
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| red88.n/a.rx |
I personally hate my single exhaust... I mean it was cheap and thats about it. I really would of been much happier with the look of duals but hey it comes down too looks vs $$$$ so make whatever choice you want.
The route I took was cheap out on dual for a single 2.5inch pipe so I could buy headers too. |
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| Al36rx7 |
The rotary engine is basically like a 2 stroke engine. A properly tuned exhaust will help the engine scavenge the exhaust...almost assist in drawing the exhaust out and not allowing the downside of the exhaust pulse to attempt to move back towards the engine. Take a look at a 2 stroke motorcycle or snowmobile engine's exhaust, and look at the shape of the exhaust....
A Street driven rotary is nothing but compromise. How many noise violations do you really want to pay? Is that last 10 hp absolutely necessary? A Naturally aspirated rotary loves less backpressure as much a turbo. A properly designed exhaust system is what you need to get as much as possible out of the rotary....usually that does not include mufflers with restriction if you are going after a max HP system.
Back pressure is a symptom of being muffled. You need it because you will go deaf if you don't have it on a rotary.
The dual pipes from the engine and the merge point (collector) is a way to try to tune the engine. There are a few different systems out there. Take a look around...and don't stop at just Racing Beat.
Just a few comments from the peanut gallery. |
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