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Rotary Tech - General Rotary Engine related tech section.. Tech section for general Rotary Engine... This includes, building 12As, 13Bs, 20Bs, Renesis, etc...

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Old 04-26-2012, 05:05 AM   #1
RETed
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Nice data...
I'm sitting on a Borla ProXS (18" case, I think) right now, but I was looking for a bigger can for "more muffle".
I think the FC rear can easily go 20" long case, with the possibility of going 22" case if you got good welding skills and patience.

In our experience, the best power versus price / size muffler is an off-set in / out with perforated tube design.
Makes sure the perforated tube is the same diameter as the in / out pipe - there are some mufflers who neck down the tube inside the muffler itself.
The offset design attenuates the acoustic element of the exhaust noise very well.
Offset = one side center; opposite side to one side of the muffler.
In a pinch, you can use a center in / out muffler, but angle the inlet and outlet pipe as much as you can.
This design doesn't muffle as well as an offset muffler, but you'll get kinda close.


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Old 05-05-2012, 10:43 PM   #2
sa22c
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In my experience the starting point should be how much muffler you can get into what car.

The best place to start would be to find a rear muffler for each car. For eg for the 1st gen rx-7 guys.

Price between $100 and $200
Pipe size between 2.5" and 3.5" (to cover NA, small and large turbos).
Sized to fill the entire rear muffler section ~8.0"x10.0"x22.0"
Centre offset and centre centre available.

The non turbo guys will need a 2nd muffler before the diff hump to keep noise reasonable

You could do the same for the FC3S and the FD3S, and then 99% of cars would be covered.

For the FC3S I'm thinking twin rear section 2.25 for non turbos, 2.5 and 3.0 for turbos.
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