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FMF SNAP
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<blockquote data-quote="PSJBrock" data-source="post: 115848" data-attributes="member: 1050"><p>products like this have been around for years. FMF acts like they are reinventing the wheel and on top of that they want a hundred bucks for it. The issue is the slide on the carb cause turbulence between 1/4-3/4 throttle opening. </p><p> </p><p>Lets say the intake boot is 4" in diameter (just for easy math sake) if you open the throttle 1/4' the slide on the carb goes up one inch. so you have air coming through the 4" air boot and trying to shove itself into the one inch opening. All the air bouncing off the slide will cause turbulence and cause the air trying to go through the 1" gap to not flow as easy. The FMF Snap or the Power now piece essentially divides the intake path into 2 or 4 separate chambers depending on what part you buy. This reduces the chances of turbulent air affecting the throttle response at lower RPM. MY KTM 450 has the power now on it and it made a big difference as I tried it with and without the unit.</p><p> </p><p>Also noticed a huge difference on my harley in which I run a velocity stack. My bike is really picky about where my leg is during the ride as my leg creates turbulence in front of the carb and it starves for air. </p><p> </p><p>Is it a necessity? NO. Is it Snake oil? NO. You can run without it, but once you put it on you will definitely be able to tell the difference. Now I could be totally blowing smoke but I believe this is why the FI model bikes use a butterfly instead of a slide to cut down on the turbulence.</p></blockquote><p></p>
[QUOTE="PSJBrock, post: 115848, member: 1050"] products like this have been around for years. FMF acts like they are reinventing the wheel and on top of that they want a hundred bucks for it. The issue is the slide on the carb cause turbulence between 1/4-3/4 throttle opening. Lets say the intake boot is 4" in diameter (just for easy math sake) if you open the throttle 1/4' the slide on the carb goes up one inch. so you have air coming through the 4" air boot and trying to shove itself into the one inch opening. All the air bouncing off the slide will cause turbulence and cause the air trying to go through the 1" gap to not flow as easy. The FMF Snap or the Power now piece essentially divides the intake path into 2 or 4 separate chambers depending on what part you buy. This reduces the chances of turbulent air affecting the throttle response at lower RPM. MY KTM 450 has the power now on it and it made a big difference as I tried it with and without the unit. Also noticed a huge difference on my harley in which I run a velocity stack. My bike is really picky about where my leg is during the ride as my leg creates turbulence in front of the carb and it starves for air. Is it a necessity? NO. Is it Snake oil? NO. You can run without it, but once you put it on you will definitely be able to tell the difference. Now I could be totally blowing smoke but I believe this is why the FI model bikes use a butterfly instead of a slide to cut down on the turbulence. [/QUOTE]
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