It has always been my understanding that only an engine with dual banks could truely be a dual exhaust car. Now the 13B doesn't have banks. Both ports are on the same side. I also cant see the logic in running a seperate exhaust pipe from each exhaust port...which would be the only way the term True Dual would fit. Some one fill me in...

 

2 exhuast ports= 2 banks= 2 pipes...

you guessed right

 

True duals (available only on an NA btw) are very cool, but also very loud and expensive. The coolest thing is the stereo effect...standing behind the car, the exhaust pulses alternate left to right, and when you rev it up, the volume increases and it sounds wicked. True duals on a rotary are very high pitched though, nothing like true duals on a piston engine...

 

True duals...too friggin' loud, or else I would have gotten it. Heard the mazdatrix car with it - at idle it's ok, but once you step on it, hell, it can wake the whole of Los Angeles up at night!

 

Not if you have twin turbos...

 

one exhaust pipe for each rotor, thats how i think of it

 

2 exhaust ports, two pipes, separate all the way back, no collector.

 

My sig has a sound clip of NA duals.
It is an mp3 in stereo.
Wide speaker placement or a head set renders it best.

 

True duals...too friggin' loud, or else I would have gotten it

Rotary Dawg
You should have bought them bro. If I were to compare them to my stock stuff it is not that much louder unless I am driving at 5 or 6 thousand RPMs.



True duals (available only on an NA btw) are very cool, but also very loud and expensive. The coolest thing is the stereo effect...standing behind the car, the exhaust pulses alternate left to right, and when you rev it up, the volume increases and it sounds wicked. True duals on a rotary are very high pitched though, nothing like true duals on a piston engine...


Loud only if you are driving hard, Cool VERY COOL, Expensive well that I believe would be an oppinion. To me not having to fabricate anything was a plus not to mention what it costs to buy a cat-back pre-scilencers headers and connecting pipes. It is a bargain in my oppinion. The stereo is wicked to say the least. They do get high pitched when flooring it but normaly they are a low sounding exhaust. It kinda sounds like you are driving a harley. I have made a couple of people notice me by reving which was cool. Mustangs now are more cautios to race me.


I have to say GET THEM they ARE worth it. unless you have to pass emmisions. Duals are numero UNO baby.

 

Sureshot, i listened to your mp3 on a some headphones and it sounds ******* awesome! I still want to hear a true dual system in person but that's much better than the Mazdatrix video.

One question, did you record that with the car in a garage? Because when the car starts that sounds amplified more than i thought it would. You did record this with the mic behind the car, right.?

 

ok, two questions.

 

The "True Dual" term is internet slang for an uncollected exhaust system. I am only aware of one commercial manufacturer for this type of exhaust, Mazdatrix, and as far as I know they also call it "uncollected", not "true dual". Supposedly it works well on a completely stock 86-92 13B, but since I have never seen a rotary race car with an uncollected exhaust, I tend to think that it does not have the potential of a collected long or short primary system.
http://www.mazdatrix.com/r-ex86nt.htm

 

It sounds sweet to me especially at high revs I have this kit that has been shown many times. http://www.mazdatrix.com/r-ex86nt.htm

 

wow you got the one with the HKS mufflers?

 

Rob@pineapple has been saying a uncollected exaust is best for mid range, and up top. They are the loudest exaust out there, but with the right mufflers, and pre-silencers, they can be quite. Case in point, my 13B peripheral port with a dual exaust, custom made to Robs specs, made something like 16rwhp less, than a open exaust peripheral motor Rob built later on.


CJ

 

The sound bite in my sig was recorded with the stereo mic a foot behind the car. directly in front of the open garage.

My exhaust evolved:
1) Stock manifold through straight pipes to bombs. – LOUD - a little power gain.
2) Header to straight pipes to bombs. – WAY too LOUD! – some power gain.
3) Header to single 3” silencer to bombs. – nice tone – nice power gain.
4) Header to dual silencers to bombs. Nice stereo tone – nice power gain with a little more low end.

So - you want peak power - go single.
If you want broad powerband - go dual.

 

Ok then, so which cans are better, HKS or RB? The price for the HKS system suggests that maybe it's quieter, or more free flowing, or something. I plan on getting TD's, but can't decide which cans to get.

 

The HKS cans are suppossed to be a little quieter but I doubt it is worth the extra cash. I have it with the RB cans and it is not crazy fart cannon loud but it does get loud in the higher RPMs.

 

Anyone thought about running "true duels" with say a mustang type H or X pipe? I have been wondering about this, anyone?

 

Nice professional recording... Should have revved it more though. I wanted to hear more.

 

Roy, when I typed my last message, I put a paragraph of what Rob had done with X pipes and H pipes, but deleted it at the last moment, because I thought it whent to far off course....

Well anyways, Rob did some testing with a bridge port motor, with a X pipe I beleive, couple years ago. He said that off the power band, the car would stumble and run like crap. No amount of tuning would change that. However, once on the power band, the car would run like a raped ape. He whent on to say, they will create more peak power, and works well for noise reduction. Thats why forumla mazdas run them. Incase you're wondering, FM, have some nice close ratio gear boxes, and are pretty much never out of the power band. So, to sum it all up, the x/h pipe will make more peak power, but loose bottom end and driveability. Hope this clears things up- CJ