Modified 7

Ok i have heard many times of people saying on this site..go with a true dual exhaust setup (For your FC), for some reason.

Now Does that mean actually to seprate pipes coming from the header, like 1 into 2? Does it mean that? Like a V8?

I thought if you do that you would rob horsepower? Or does true duals mean the y-pipe into 2 mufflers?

Im still confused...i have searched and no results cam up. So plz help me out, thanks.

maxcooper

True duals means one pipe dedicated to each rotor.

As for how well this does or does not work, I don't know.

-Max

gxlspeeder

It works well with non stock porting. A true dual you don't tune the length of the header. A collected head would be better if tuned to the right length.

Evil Aviator

"True dual" was originally internet slang for the Mazdatrix uncollected exhaust:
http://www.mazdatrix.com/r-ex86nt.htm

Racing beat now makes their own version, and actually does use the true dual term. Scroll down a little on this page and see "Road Race Exhaust System":
http://www.racingbeat.com/FRmazda2.htm

... but you still tune the length of the pipe.

I have only seen winning race cars running a collected exhaust, so I am also going to assume that the above statement is true. However, I have not seen any direct comparison testing to either support or contradict that claim.

gxlspeeder

I haven't seen any comparison either but I assume it would reak the same benefits as an x or h pipe on a v piston engine. One side of the exhaust is drawing a little bit of vacuum to the other side thus "pulling" it out from the engine. Making the engine more efficient.

rotarygod

iTrader: (1)

An H pipe or an X pipe are totally different on a V8. since the engine doesn't have evenly spaced firing orders per each header, some of the pulses are overlapping in the header while others aren't. These pulses eventually build up pressure at a certain point downstream of the header. This is the point where the H pipe or X pipe is placed. This excess pressure that is hurting flow is bled off to the other side of the exhaust. A standard H or X pipe doesn't scavenge. The newest things the V8 guys are using is called a tangentially siamesed X pipe. These do scavenge.

A true dual exhaust does not scavenge. It only tunes based on pipe organ resonance theory. Without your pipes collected, you can't help pull gasses out of the other pipe. A collected system does this.

A true dual is best on stock to streetported engines. The more overlap you have, the more important it is for a scavenging type of exhaust system in order to make the most power. Once you get to a bridgeport or a peripheral port, you absolutely must use a collected system to get the most power. If you aren't you are wasting your time. The car may run, but it could be so much faster.

The farther back you collect the exhaust on a rotary, the harder it is to muffle. Just consider a true dual exhaust collected at infinity. The more overlap you have as in more extremem porting, the more important a better flowing exhaust with less backpressure and less muffling.

intro_kz

I'm looking for a new exhaust system for my 88 n/a. Right now it's running a bridgeported engine on the stock exhaust system and I don't envision doing too much work to the engine. The car already puts out 235 rwhp and I don't race it (unless you think your civic is badass). I've been looking at the Racing Beat exhaust systems and I think that's the way I want to go but I don't know what system would be best for my car. Any advice?

rotarygod

iTrader: (1)

You're running a bridgeport on a stock 2nd gen exhaust manifold? I'm VERY surprised you can get anywhere even near 235 rwhp with that setup. Get a collected header system on there. Do not go with duals on a bridgeport. High overlap engines need exhaust scavenging. Dual systems do not do this. At the very least get a header on it, remove the cat, and get a nice free flowing muffler system. Your power increase will be very nice.