ASK THE MXPERTS: ISN’T MXA’S KTM 350SXF HORSEPOWER EQUATION WRONG?

January 22, 2011
Comments off
117 Views
facebooktwittergoogle_plusredditmailfacebooktwittergoogle_plusredditmail

Dear MXA,
    In your 2011 KTM 350SXF test you said, “The KTM 250SXF makes 38.25 horsepower, the 350SXF makes 46.94 horsepower and the 450SXF makes 53.92 horsepower. Rounded off, there is an eight horsepower difference from the 250 to the 350 and from the 350 to the 450.” By my math that is a 6.98 horsepower difference between the 350SXF and 450SXF. Why did you round it off to eight horsepower? That is inaccurate.



We can see why at first glance you would question our math. The reason we rounded the power difference off to eight horsepower, even though the difference is only 6.98 horsepower at peak, is because peak horsepower is only one small slice of the dyno curve. If you look at other points on the rpm curve you discover that the KTM 450SXF makes 11 horsepower more than the 350SXF at 6000 rpm, 10.5 horsepower more at 7000 rpm, 11.6 horsepower more at 8000 rpm, 8.5 horsepower more at 9000 rpm and 5.7 horsepower more at 10,000 rpm. When you consider the 6.98 horsepower difference at peak, you can easily see why we rounded up to eight horsepower instead of down to the 6.98 horsepower that your math suggests.

facebooktwittergoogle_plusredditmailfacebooktwittergoogle_plusredditmail

Comments are closed.