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02-22-2011
Cone is a vast improvement over the drop-in filter.
Flow test by ZZP on different size cones:
227 CFM on 9" long 4" inlet clean K&N
181 CFM on 7" long 3.5" inlet clean K&N
As you can see, the 9x4 is what... a 22.5% improvement over the 7x3.5? and the 7x3.5 is easily an improvement over the stock setup.
Last edited by SlowNA06; 02-22-2011 at 05:54 PM.
02-22-2011
skip the 45* and find a 22.5* bend. less bends for more flow. pushes the filter toward the fender more too, not that it really helps.
i got a 22.5* 4" elbow, the coupler and clamps from lowes for around $13.
02-22-2011
Originally Posted by oneil.GTP
Not that it much matters,
According to SlowNA06, the 9" long 4" Dia filter is flowing 227CFM. If we assume that those values as correct, and are for redline RPM, then the 4" tube is flowing 3.78CFS which equates to 43.33ft/sec air speed. This is 29.54MPH air speed through the tube. A 45* elbow shouldn't be too restrictive given that speed.
If I made another intake I would possibly use a 60* elbow instead of a 45* since it would point at the front headlight nicely. I think the 22.5* goes into the pit of the fender though, which is nice.
I got bored and so decided to post this.
02-22-2011
ZZP's tests also indicate the following results before adding a filter:
238 CFM on 5" of straight 4" Pipe
220 CFM on 26" of straight 4" Pipe
183 CFM on 26" of straight 4" Pipe + 90* Bend
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