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2009 Yamaha VMax VMX17

Aftermarket Parts

Air Filter Inertia Dyno Challenge

Yamaha Stock Air Filter Verses

Evoluzione Cyclesports  

Performance Air Filter

UFO Performance  

Max Air Filter

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 Bike

Bob (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:

Bad Max's Bike with Stock Exhaust, Air Box Modified and YCC-I intact. Results arranged by testing order. 

Filter SAE Corrected Uncorrected (Actual)
Evoluzione
UFO
Stock
 

Bad Max's Bike Comparison Charts

Run Numbers SAE Corrected Uncorrected (Actual)
Evoluzione - Run 11

UFO - Run 13

Stock - Run 9

 
Note: During testing, we discovered Bob's bike always made the best horsepower when the bike was cold. This caused some re-testing where we allowed the bike to completely cool down between filter changes. In my book, this is an indication his stock bike needs a fuel adjustment. 

Test 2 - Modified Bike

My bike (Eleanor) with UFO Cat Sass, Afterburners, Max Tuner, YCC-I intact and the Air Box Modified. Results arranged by testing order. 
Filter SAE Corrected Uncorrected (Actual)
UFO
Evoluzione
Stock
 
Note: A Max Tuner adjustment to attain an AFR of 12.8 at peak horsepower was made for each individual filter. I did not attempt to adjust the mid to bottom AFR due to time constrictions. I adjusted the Max Tuner while looking at a real time O2 chart feature on the display of the LM-2. The Stock and Evoluzione filter both required less fuel.
 

Eleanor's Comparison Charts

Run Numbers SAE Corrected Uncorrected (Actual)
UFO - Run 23

Evoluzione - Run 28

Stock - Run 31

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.

 

SAE Corrected

Uncorrected (Actual)

With this last test, I am done beating this horse.