Further to Jac Macs post, here is the muffler I am using, that I built in consultation with him.
Salient points are that it retains the tuned tailpipe length before dumping into the muffler. The cross sectional area the gas has to pass through between the baffles is greater than the tailpipe area. The muffler is seperated down the middle as two self contained units, but would probably be even quieter if both tailpipes dumped into the whole thing as a common chamber. It contains no sound deadening packing. I guess a picture is worth a thousand words.
Although I have not done back to back dyno testing with and without the muffler, I am confident that I am not taking a power hit with it. Disadvantages are weight (28kg) and size, but I feel the superior power I'm sure this gives me over most other setups more than compensates. To give an idea of scale, tailpipes and muffler outlets are 3" diameter, primaries 2" and the muffler is 6" deep.
Trackside observers cannot believe how quiet the car is. That is the first comment, usually followed by equal disbelief about how much grunt it has got. Guys who have watched the video Leon posted of the first start up have made the same comments about quietness. The lap times I am doing put me firmly in the top three in my class, so I think I have achieved my goals with regard to the muffler......
Salient points are that it retains the tuned tailpipe length before dumping into the muffler. The cross sectional area the gas has to pass through between the baffles is greater than the tailpipe area. The muffler is seperated down the middle as two self contained units, but would probably be even quieter if both tailpipes dumped into the whole thing as a common chamber. It contains no sound deadening packing. I guess a picture is worth a thousand words.
Although I have not done back to back dyno testing with and without the muffler, I am confident that I am not taking a power hit with it. Disadvantages are weight (28kg) and size, but I feel the superior power I'm sure this gives me over most other setups more than compensates. To give an idea of scale, tailpipes and muffler outlets are 3" diameter, primaries 2" and the muffler is 6" deep.
Trackside observers cannot believe how quiet the car is. That is the first comment, usually followed by equal disbelief about how much grunt it has got. Guys who have watched the video Leon posted of the first start up have made the same comments about quietness. The lap times I am doing put me firmly in the top three in my class, so I think I have achieved my goals with regard to the muffler......
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