| | How to determine speed? | |
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+3redlinemotorsportts Doug Jerbear0612 7 posters | Author | Message |
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: How to determine speed? November 26th 2013, 7:36 pm | |
| It might have been asked here before but I couldn't find it guys. How would you calculate the speed of a tractor if you know the transaxles gear ratios aswell as pulley size.trying to do some calculations for speed before I go spending lots of money on multiple pulley swaps. Thanks guys | |
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? November 26th 2013, 8:03 pm | |
| Most reliable way I have found is to go for it, either with a tailgater in a car or GPS. ![](https://i.servimg.com/u/f86/19/98/54/71/separa13.png) Head Forum Administrator ** Chat Moderator ** Facebook Page AdminATLTF Facebook Page ** Chatbox ** How To Upload Pictures
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| ![Go down](https://2img.net/i/empty.gif) | | redlinemotorsportts Moderator
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? November 26th 2013, 8:07 pm | |
| - Jerbear0612 wrote:
- It might have been asked here before but I couldn't find it guys. How would you calculate the speed of a tractor if you know the transaxles gear ratios aswell as pulley size.trying to do some calculations for speed before I go spending lots of money on multiple pulley swaps. Thanks guys
It would be easy peasy if you didnt have vari drive. kinda a guessing game with them. With a normal calculator you need -engine highest rpm (normal running) -highest transaxle gear ratio (example 8:1) -what pulleys obviously -what size rear tires. But the vari drive is basically a cvt clutch, one belt expands, one contracts. But in, if you put a pulley on the rear that was twice as small as stock, would it be twice as fast? | |
| ![Go down](https://2img.net/i/empty.gif) | | cumminsbayou Member
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? November 26th 2013, 8:13 pm | |
| The easiest way to do it is get the free speedometer app on your smart phone. If you have a smart phone lol. | |
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? November 26th 2013, 11:51 pm | |
| I do have a smartphone. I'm not trying to determine the speed of my varidrive tractor, guess the cats kinda out of the bag I picked up another tractor from my towns dump for free because the deck had rusted out on it. It's a craftsman with a 20hp command vtwin with a 6 speed rear end:D guy even left half a tank of good gas in it for me lol | |
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? November 27th 2013, 7:45 am | |
| How fast do you want to go? I have a six speed spicer, 13.5 hp briggs with the pulley sizes of 6 inches to 5 1/2 inches, and with 20 inch rear tires it goes 15-20.... Well 17 wide open(not governed) but it was still accelerating I just didn't wana blow it up haha so for a racer? Maybe 30-40mph ? I'd say a 8 inch on front and maybe a 3 inch on back. Seems like itd be pretty damn quick with that, specially with 20s on the bwck | |
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![How to determine speed? Empty](https://2img.net/i/empty.gif) | Subject: Re: How to determine speed? December 18th 2013, 1:42 pm | |
| Its really easy to calculate the speed of your tractor use the GPS on your phone. It will tell you teh speed you are travelling | |
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