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Leg Sports makes one too. As to whether or not it is functional- doubt it. I'm personally going with an RE Amemiya FD diffuser for mine, but that's going to require some creativity lol.
Re-amemiya diffuser; If diffuser are not functional, why do companies make them? All aero kits from reputable rotary shop make their kits for circuit use, battling down-force at speeds excessive of 200km/hr. Selling parts is secondary to their business.
Most of the crap that is made is because of the gullible people willing to buy it or they just don't understand aero any more than yourself. As long as you have an OE size muffler in that position and bring your diffuser in underneath it then it's basically BS. Even in the pic I posted that big canister us an issue even if it had a proper diffuser plate positioned up close to the bodywork.
Instead of placing your faith in F&F mindset engineering try researching and educating yourself on diffuser theory and whst it actually requires to be truly functional. I don't mean any of this as harshly as it probably comes across. Just because something is popular or common doesn't mean squat. Just like all the people on here that have a misguided fantasy that a header with long tubes on a Renesis has to be end all of power perfection.
Originally Posted by 2hit6
Re-amemiya diffuser; If diffuser are not functional, why do companies make them? All aero kits from reputable rotary shop make their kits for circuit use, battling down-force at speeds excessive of 200km/hr. Selling parts is secondary to their business.
Can you see the differences here? The low positioning, low angle, enclosure, length or projection out the back, etc. is important. In the pic you posted the open cavities ahead of and above the muffler just relegate it to an expensive air brake scoop ...
about 9-10 degree is the maximum tilt you want from a diffuser to create any downforce, otherwise it'll just create vortex/drag which is what all our bumpers are doing. You also need a full underbody covered to actually utilize a diffuser. I bought sheets of alumalite couple years ago to make one, but it's complete PIA! You also need some roller/glass work to make it somewhat stock, not like a tacked on cardboard by a 7yo.
^^^ The smoothed chassis bit is the absolute truth. Even if you have a working diffuser, it will still catch a decent percentage of the air under the car and cause some drag, effectively neutralizing its own effectiveness.
Also for any real effectiveness, the car needs to be extremely low. I can't remember where I read it, tho I know if was written by an experienced aerodynamics tech, the best height is 1 inch from the ground and you dramatically lose effectiveness the further away you get. Hence why you see every Super GT and most time attack racers practically laying on the ground.
I am not expert, but I have done quite a bit of "read-search" about areo...
Check out this Link . Its a good read and simplistic... but may give you a clearer understanding of how much work it its to make an effective aero under belly. oh and you may want to start from beginning of Thread i linked...
12-25-2014, 10:45 AM
