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2009 Yamaha VMax VMX17Aftermarket PartsAir Filter Inertia Dyno ChallengeYamaha Stock Air Filter Verses
4/26/09 After recently releasing the Air Filter Air Dyno video wherein I perform a test of the three currently available air filters on a K&N Air Dyno, the results were disputed. In light of this dispute, I agreed another actual dyno test of the filters on a stock and modified bike was warranted. Test 1 - Stock BikeBob (Bad Max) offered the use of his bike for the stock bike test. Excluding the Air Box modification and EXUP being un-hooked, the remaining performance related portions of his bike were in stock form. Here are the results:
Test 2 - Modified Bike
I think these tests represent two different buyers. Test One would be the "Stocker" that buys a filter and considered the air box mod to be far enough. Test Two would be for the more serious "Tuner" that will be adding pipes and visiting the dyno shop to make fuel adjustments. If you go beyond these two buyers types, eventually your bike isn't going to have an airbox. Since I have been testing it, the Air Box mod seems to be a good mod for the aftermarket filters. To be honest, I was quite surprised to see the filters so close after performing the Air Dyno test. From dyno'ing Bob's bike it looks like a fuel tuner will be a wise investment, if not a necessity, for anyone upgrading the air box and filter. As for my opinion on which filter to buy, it depends on which one of the above you are. Honestly, I will say after getting done and looking at the two replacement contenders on my table, I thought "wow, not so bad, it did god, but a pony is a pony". Then I'll give you one guess as to the one I re-installed. The days are numbered for my airbox anyway. NEW! Click HERE to Download the Viewer and Run Files Blog 4/27/09 I had a chance to play with the Dynojet Run Viewer software. To change what is charted, click to left, right, and bottom of the chart. It will prompt you for the chart inputs. Blog 4/28/09 I was still surprised and puzzled about the air filter test, so I did another quick dyno test this morning before I started stripping off the air box. Just for my own peace of mind. Reason being, it occurred to me the remaining rear intake half of the air box may still be restrictive even with the rear filter cover removed. When the faux tank is re-installed, it almost re-instates the original tracts extending into the scoops to the left and right of the filter. All of our previous testing was done with the bike assembled. This morning I removed the faux tank and pulled a few runs. The bike was making 2 hp less than day before (goofed and put 87 octane in the tank, bad habit). Long story short, it made a little difference. Click here for the zipped run files. Of course, all of these are static dyno test. Run 4 - UFO with faux tank cover ON. Run 7 - UFO with faux tank cover OFF. Run 12 - EVO with faux tank cover OFF.
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