Anyone have a CC Dyno graph with an underdrive pulley installed - Victory Forums - Victory Motorcycle Forum
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post #1 of 4 (permalink) Old 09-21-2015, 07:52 PM Thread Starter
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Default Anyone have a CC Dyno graph with an underdrive pulley installed

Looking for graph for a Cross Country or Cross Roads.
Trying to see where the torque curve shifts to.

2012 Vision - in process of converting to Cross Country rear end and bags
Lloyd's -Filter-Timing wheel-Adjustable Intake-Throttle ring
Home built 2 into 1 pipe with dummy pipe on left looks stock
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post #2 of 4 (permalink) Old 09-21-2015, 09:24 PM
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Curve shifts very slightly to the left, and the numbers go down as you move away from a 1:1 ratio.. Feeling wise makes it feel pretty brutal

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post #3 of 4 (permalink) Old 09-22-2015, 12:46 AM
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If you order a UD pulley maybe you should consider to let it install by your vicshop

I ordered 3 piece UD pulleys (2x narrow tire & 1x wide tire) and our vicshop installed 1 on a vision, after a few hondred Km all the spline tooth got bend as per picture ... No money back from the supplier though ...

For my Jackpot i have a UD but never installed and a harley belt on its way, so guess i will install this famous UD and see what happens ...
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Last edited by BP6666VR; 09-22-2015 at 01:28 AM.
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post #4 of 4 (permalink) Old 09-22-2015, 03:39 AM
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I bought and installed the 31 tooth pulley in 2007. It was one of the first things I bought for this bike. Still works great without issue on a bike that makes a lot of power.

As far as a dyno graph is concerned it will show less power/torque. I don't see why the graph would move left. It wouldn't change what rpm the engine makes torque at... all you are changing is final drive ratio.

The pulley shortens up the gearing by almost 7%. It affects every gear equally. In 6th at 70 mph instead of 2500 rpm you would be turning 2675.

On the dyno, 6000 rpm in 5th reads roughly 145 mph on my bike. Not a huge change, just makes the gearing a little shorter.

2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
Primo Clutch Spring, 31 Tooth Pulley w/Buell Belt.

Last edited by half_crazy; 09-22-2015 at 03:42 AM.
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