Test Sled: 2000 Polaris XC600 SP
Mileage: 1250 miles at time of Dyno runs
Carb Jetting: Stock 410 Mains with 40 Pilots for ALL runs.
Fuel / Oil: Premium 93 octane, Polaris Gold Synthetic Oil
Ambient Temps: 36-40 deg. F
Dynojet Track Dynomometer; fully replaced sled's suspension / skidframe
with Dynojet setup.
Image #1: Stock Setup. 100% completely stock. Baseline.
Peak HP: 57.5
Comments: This is the best dyno run from the baseline set of runs. Engine and pipe were brought to operating temps before dyno runs were performed. Notice how the HP curve tails off at 50mph, with HP sitting around 50hp from 60mph up to 85-90mph.
Image #2: Stock Setup (from Image #1) vs. Clutched & Twin
Pipes
LRM Twin Pipes - Advertised gain of 10-11 HP at 8200rpm.
Peak HP after installation of twin pipes: 67
Peak HP stock: 57.5
Comments: Jetting was UNCHANGED from stock for this run.
Jetting was noted to be quite rich during the dyno trials. The installation
of the twin pipes increased peak HP output by 5hp vs. the clutched setup,
and 9.5 peak HP over the stock setup. However, the real impressive
portion of the dyno runs is again what happens from 50mph up to 90mph.
While the stock setup slowly degraded from its peak at 50mph (57.5hp) to
90mph (45hp), the twin pipes / clutched setup provided BIG gains over that
same span, with the modded still bringing in 60hp at 90mph! At 50mph,
the modded setup produced 64hp, yet the power still increased until about
65mph was reached. At 65mph, the modded setup produced 67hp, versus
the stock setup of only 50hp. This is an improvement of 17 TRACK
HORSEPOWER. From 60mph through 90mph, the modded setup provided an
additional 13 to 17 track horsepower.
