Originally Posted by brabusw209amg' post='687198' date='Oct 7 2008, 12:45 AM

... Now if there's a variable switch depending on the speed, the angle of the scoop changes, then we're talking but by then, why don't we just get a supercharger.

Originally Posted by brabusw209amg' post='687198' date='Oct 6 2008, 11:45 PM

it's all marketing. dont get me wrong, i am sure they did lots R&D before finalizing the product but if I made a product with 5 minutes time and made it look very nice, would you spend big money on it? Absolutely not. Remember fluid dynamics and aerodynamics? both very similar concepts and we can picture with liquids a little easier. turbulent flow is not good. You want laminar flow. There's also transitional flow that's in between. In real world life, there's hardly any laminar flow. RPI designed so that there will be less pressure loss and try to pressure the air as much as possible through the tube. There's pressure loss due to friction at all times and with SO MANY 90 degree angles, it will create HUGE turbulent flows. Re=density*velocity*diameter/viscosity. Laminar flow: Re < 2000; Transitional flow: 2000 < Re < 4000; Turbulent flow: Re > 4000. The better the design for air gushing into the tube with more pressure (higher the pressure, the more force it has going through the turbulent flow around bends and friction), the more air it will go into the tube resulting in the air box. That's a main reason why it's angled at 90 degrees rather than 45 degrees. More pressure. This is why it wouldn't work at low speeds. it's useless. Now if there's a variable switch depending on the speed, the angle of the scoop changes, then we're talking but by then, why don't we just get a supercharger.

Originally Posted by mrfva' post='685729' date='Oct 5 2008, 11:15 AM

It's not that folks do not understand what a DIY is all about. We do. But the item in discussion here has a primary purpose, which is to increase performance for the engine. RPI has extended themselves in research and development with proven results for their products. Eloy has developed several prototypes and countless adjustments to each product based on their data.



Until you dyno that thing and get some true numbers, it's merely for looks. Don't get me wrong, I do admire your dedication in your effort

Originally Posted by vegastrashed' post='683087' date='Oct 1 2008, 03:16 PM

FYI, I hope you have a dynamometer. More than likely you're LOSING power with the homemade scoop. Case in point, keang24 was outfitted with newer and bigger scoops for his M5. Soon thereafter, he did some highway pulls with another M5 and the results were most disappointing. When his M5 was dynoed, he had LOST 20rwhp. So, he put his original scoops back on and regained the 20rwhp. There is a science to making the ram air scoops and homemade ones aren't going to cut it. Good luck in your endeavor.