What % Change on SpeedoDRD 14 tooth CS - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 6 Old 03-14-2015, 02:51 PM Thread Starter
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Join Date: May 2012
Location: Northern Colorado
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What % Change on SpeedoDRD 14 tooth CS

Hi, all. Been absent for a while. I live at 8,100 feet elevation - I think I've read that you loose 3 % HP with every added 1,000 feet elevation, so I think my 2012 DL650 is down nearly 25 % HP up here. I would like to try to get a little quicker throttle response, so I bought a 14 tooth counter shaft sprocket, down one from the 15 tooth stock sprocket. I've also purchased a SpeedoDRD.

I've researched the threads and cannot find what I need. Can anyone tell me what percentage that I need to adjust the SpeedoDRD to correct the speedometer when changing down one tooth on the counter shaft?

Many thanks.

RR
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post #2 of 6 Old 03-14-2015, 04:59 PM
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Location: West Monroe, La. U.S.A.
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If I'm not Badly mistaken, each 1 tooth up or down is close to 8% variance on a "Per Tooth" basis.
This should put you in the immediate ball park figuring it on paper...
To be Sure, check it with a known accurate GPS unit's speed reading.
Going up 1 tooth on my '15 put it within 1 mph of dead on. Now the odo reads 3~4% slow though... F.W.I.W..
:beatnik:

[B][I]~ Stretching the Limits of Performance & Good Taste ~[/I][/B]
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post #3 of 6 Old 03-14-2015, 11:42 PM
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I calculated -14%. Now my speedometer is correct but not my odo.

you will find the calculation to determine this number in the manual for the speedo thingy. You need to determine what your actual speed is first. Using a GPS is the most common method.

14 tooth for me

Last edited by chicago; 03-16-2015 at 01:52 AM.
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post #4 of 6 Old 03-24-2015, 05:12 PM Thread Starter
$tromtrooper
 
Join Date: May 2012
Location: Northern Colorado
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Chicago was right

After installing the 14 tooth counter shaft sprocket (stock is 15) i set the DRDspeedo thingy to -14%. I checked the speedometer today with a GPS and it's dead on. I also agree with Chicago-the 14 tooth is the way to go for me.

Best/RR
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post #5 of 6 Old 03-24-2015, 05:21 PM
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Join Date: Feb 2013
Location: SE Ohio
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Love my 14T sprocket. Gives me a lower first gear and better aceleration. Thanks for the reminder that I haven't changes my DRDspeedo compensation since I put on the new sprocket.

Current: '12 Dl650, '06 ST1300, '89 Transalp, '84 XL350R, '07 TRX350TM,
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post #6 of 6 Old 03-24-2015, 05:27 PM Thread Starter
$tromtrooper
 
Join Date: May 2012
Location: Northern Colorado
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One more thing

Oh yeah, one valuable trick that I learned during this exercise in trying to get the OEM 15 tooth off:

Heat the thing up with a heat gun or torch (heat gun for me, they're cheap at Harbor Freight).

Put the tranny in neutral on the center stand.

Go get your bride to stand on the rear brake.

Use a two foot breaker bar. I had to stand on it to finally get the red thread locker to break loose. I put blue thread lock on the 14 tooth.

Best/RR
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