Something to keep in mind is that the human ear is more sensitive to higher frequencies; this means that we perceive these sounds as louder. If a muffler or baffle is added to the equation then the pipe size has only a minor affect on the overall sound. Also, a muffler can alter sound significantly depending on the design. Many technologies are employed in the design of mufflers or baffles.
At this point we need to understand the difference between a muffler and a baffle. A muffler is a mechanical assembly that employs multiple components and technologies to reduce sound in an exhaust system.
A baffle is a mechanical device used to disrupt sound waves. In most cases baffles are used as a component in a muffler assembly. Muffler assemblies are far more complex. These assemblies can incorporate many components to alter sound waves.
These components can range from packing materials such as fiberglass, ceramic wool, and stainless wools to perforated tubing, baffle tubes, and baffle plates or any combination of these components. Due to the vast design configurations and their abilities to manipulate sound, there is no hard fast rule that can be given to say how a specific muffler will sound.
All street exhaust designs are a balance between power and appropriate sound quality. Something else to keep in mind is that the engine configuration plays the biggest part in overall sound. Compression ratios, cylinder heads, cams, and ignition timing all affect the sound output of any given engine.
Slip-ons are just as they infer. Loosen the clamp at the inlet of the muffler, remove the mount bolts from the muffler and remove the muffler from the bike. Reverse the process to install the new mufflers. A performance exhaust is designed to improve airflow through the engine. Anytime you can improve the efficiency of airflow through a combustion engine you can increase performance. SuperTrapp discs provide a scavenging effect. As hot exhaust gases pass through the discs to exit the muffler they enter a larger area, creating a slight pressure drop as the gas expands, creating a scavenging effect.
This larger charge lets the engine create more power and this is why it is very important to use discs. The discs are always installed with the flat surface against the end of the muffler and the tapered outer lip pointing away from the muffler. Always remember to use an end cap with the discs.
The end cap is formed to nest into the discs and is an additional indicator of the correct installation direction.
Check the color of your spark plugs. You need to remove discs. You need to add discs. Click here to view an example of these 3 spark plug colors. Watch our video for a detailed explanation and demonstration.
Closed End Cap vs. Open End Cap Video. Part Number Location Video. Home FAQ. Questions What is the major benefit of using SuperTrapp products? How do the diffuser discs work? How many diffuser discs should I run? How do SuperTrapp mufflers reduce noise? Will removal of the packing material increase performance?
How often do I have to re-pack? How do I repack my IDS2? Do I need to re-jet? Will I be able to maintain my center stand and drain plug access? What is the warranty on SuperTrapp exhausts? How tight should disc screws be? Do disc screws need Locktite or an anti-seize compound on them? What is the difference between a exhaust system and a system and why does a provide more power?
Why do some aftermarket pipes backfire when you decelerate? How does the length and diameter of an exhaust effect sound? Do you have to take the complete exhaust system off to change slip-ons? What does a performance exhaust do? Does it give more power? How do SuperTrapp mufflers reduce noise? The number of discs used determines how much total sound energy will be absorbed and diffused. Fewer discs will have less open area and tone down the exhaust note. Most mufflers today reduce noise levels in several different ways, such as sound absorption, reflection using baffles or resonating chambers, or restriction.
Physics tells us that air in motion does not like to change direction. How many diffuser discs should I run? The answer depends on your displacement: disc diameter, power band, and noise level. Fewer discs reduce sound levels, more discs increase sound levels. Fewer discs increase low-end torque and richen the carbureted fuel mixture.
More discs increase sound levels, increase top-end power and lean out the carbureted fuel mixture. NOTE: When tuning an exhaust system, start with fewer discs and add. Never start with a lot of discs and subtract. Generally on a stock set up no engine modifications, and stock carb and air filter , you can start with six to eight discs on dirt bikes and ATVs. On V-twin, metric and cruiser bikes, start with twelve discs.
A popular misconception: The more free-flowing an exhaust system is, the more power it will make. This is not true. Some backpressure PSI is necessary to achieve maximum power.
This is why it is necessary to use the discs that come with your tunable SuperTrapp exhaust. The number of discs to use will depend on your application, displacement, disc diameter and power band. To assess the performance of any product that affects horsepower and torque, lap times and Dyno- runs are your best indicators.
Pay attention to the coloration of the discs. Little or no disc coloration indicates a possible lean condition remove one or two discs.
Black or sooty discs are indicative of a rich, or oil burning condition add one or two discs. Discs that turn a tan or golden color indicate an acceptable balance of fuel mixture and exhaust flow. Reading a spark plug is the quickest way to check if everything in the engine is working as it should. And, it will tell if the SuperTrapp has been tuned properly. A rust-brown spark plug color indicates that the plug is operating smoothly exhaust is tuned correctly.
The discs are installed between the end of the muffler and the end cap. Each disc adds a small gap for the exhaust gases and noise to escape through. Adding more discs under the end cap will increase the number of gaps for the exhaust to escape, while fewer discs will decrease them.
More gaps means more flow, more high-end power, and more noise. The upper limit would be to remove all discs and the end cap, making the SuperTrapp into a flow-through glasspack muffler.
Fewer discs means more restriction, more low-end torque, and less noise. This also means that you can change the number of discs to suit different tracks and weather conditions.
Unfortunately, there are far too many variables to be able to predict how much the exhaust sound will be reduced. Bore, stroke, compression ratio, number of cylinders, RPM, header design, and even the weather can all affect decibel levels. Start with the largest SuperTrapp muffler you can fit on your application. This will be a compromise between weight, available room, and pipe diameter. Try running just three discs at first.
If you are well below the sound limit, gradually increase the number of discs while monitoring your sound readings. Stop adding discs when your sound readings get close to the limit.
We recommend keeping a safety margin of dB under the limit. Note that you may reach a point where adding more discs no longer increases power, or bottom-end torque suffers. In that case, just run the number of discs that balances high-end power with low-end torque. High barometric pressure cold, dry days transmits more noise than low pressure warm, humid days.
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