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| Help need on gear ratio on 17.5T https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=24&t=12381 |
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| Author: | Aki [ Wed Feb 15, 2012 21:47:02 ] |
| Post subject: | Help need on gear ratio on 17.5T |
Hi everyone, I need help on Gear ratio for the X12 with Reedy Sonic2 17.5T. I am using the Hobbywing 1S ESC with 30 deg Timing boost. Rear tire around 45.5mm dim. I tried 80/43, 80/40, 80/37 spur/Pin combo, still I have poor acceleration and less speed on the straight compare to others 1/12 in a medium size indoor Capt track. I asked one of the 1/12 driver, and he said he is using 85mm rollout. Should I go back to the stock 96T Spur ? Thanks, Aki |
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| Author: | Marek Gadomski [ Wed Feb 15, 2012 23:10:22 ] |
| Post subject: | Re: Help need on gear ratio on 17.5T |
hello With 80 spur, you need pinion about 45 (45 gives around 79mm roll out ) So 45 is good starting point, also set your speedo as this guy's one Watch temp. of motor and speedo every 2 mins in first run (Max temp for motor [it depends] are around 80*C) PS Roll out is how far car go when motor does one turn (wheel dimension in mm) * 3,14 (pi) / (Gear ratio>spur/pinion) = rollout in mm For you > 45,5 * 3,14 / 1,77 (80/45) = 80,7 mm roll out  Have Fun ! 
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| Author: | tnewlon [ Thu Apr 12, 2012 07:19:43 ] |
| Post subject: | Re: Help need on gear ratio on 17.5T |
We run around a 85 roll out at our track as well (owned by XRAY's Drew Ellis )With fresh cut tires (44mm), I run a 74 spur / 46 pinion = 85.92 roll out with 13.5 motor. With 17.5 it appears that everyone runs 96-102 (depends on the motor). Hope this helps some |
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