All-Terrain Lawn Tractor Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

All-Terrain Lawn Tractor Forum

Like riding lawn tractors through mud, woods, rocks, and snow? Then this is the place for you! Share your ideas, Post your projects and more!
 
PortalHomeSite RulesEventsFAQSearchRegisterLog inBuild-Off

 

 How to determine speed?

Go down 
+3
redlinemotorsportts
Doug
Jerbear0612
7 posters
AuthorMessage
Jerbear0612
Member
Jerbear0612
Member


Age : 28
Join date : 2013-04-23
Points : 4334
Posts : 89
Location : Salem ct

How to determine speed? Empty
PostSubject: How to determine speed?   How to determine speed? Icon_minitimeNovember 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
Back to top Go down
Doug
Site Owner
Doug
Site Owner

2500+ Posts
2500+ Posts!
2014 Build-Off Entrant
2014 Build-Off Entrant
2017 Build-Off Entrant
2017 Build-Off Entrant

Age : 29
Join date : 2012-12-24
Points : 7773
Posts : 3047
Location : Lebanon County, PA

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 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.


Head Forum Administrator ** Chat Moderator ** Facebook Page Admin
ATLTF Facebook Page ** Chatbox ** How To Upload Pictures

_X_ FORUM ANNOUNCEMENTS _X_


Have a question? Ask me! Type in "@Doug" in your post!

Your ATLTF Staff:
Administrators: @Doug, @MightyRaze, @"Doc Sprocket", @Stretch44875
Moderators: @TheRainbowBoxer, @AllisKidD21, @Brianator, @RichieRichOverdrive




Back to top Go down
redlinemotorsportts
Moderator
redlinemotorsportts
Moderator

2500+ Posts
2500+ Posts!
2014 Build-Off Entrant
2014 Build-Off Entrant

Age : 27
Join date : 2013-03-18
Points : 7474
Posts : 3131
Location : raleigh nc

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 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?
Back to top Go down
cumminsbayou
Member
cumminsbayou
Member

2014 Build-Off Entrant
2014 Build-Off Entrant

Age : 27
Join date : 2011-11-04
Points : 5012
Posts : 232
Location : fairhope Al.

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 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.
Back to top Go down
Jerbear0612
Member
Jerbear0612
Member


Age : 28
Join date : 2013-04-23
Points : 4334
Posts : 89
Location : Salem ct

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 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 
Back to top Go down
Jerbear0612
Member
Jerbear0612
Member


Age : 28
Join date : 2013-04-23
Points : 4334
Posts : 89
Location : Salem ct

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 26th 2013, 11:53 pm

I'm attempting to make a racer out of it for a winter project
Back to top Go down
GenevaCustoms
Member
GenevaCustoms
Member

2014 Build-Off Entrant
2014 Build-Off Entrant
2015 Build-Off Entrant
2015 Build-Off Entrant

Age : 27
Join date : 2013-09-24
Points : 4406
Posts : 315
Location : Florida

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 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
Back to top Go down
motorizedeverything
Member
motorizedeverything
Member

2014 Build-Off Entrant
2014 Build-Off Entrant

Age : 26
Join date : 2013-01-02
Points : 4692
Posts : 356

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeNovember 27th 2013, 8:17 am

we actually already had a thread about this

https://www.atltf.com/t2220-speed-calculation
Back to top Go down
FOSWMT
Member
FOSWMT
Member


Join date : 2013-07-28
Points : 4320
Posts : 163

How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitimeDecember 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
Back to top Go down
http://www.friendsofspeckledwood.org.uk
Sponsored content





How to determine speed? Empty
PostSubject: Re: How to determine speed?   How to determine speed? Icon_minitime

Back to top Go down
 
How to determine speed?
Back to top 
Page 1 of 1
 Similar topics
-
» How I determine engine speed.
» How fast does your tractor go?
» CVT going to a 5 or 6 speed....For high speed tractors: Vario drive clutch, going to MST205 or 206
» tranny ? 5 speed or 6 speed
» i cant seem to get good power

Permissions in this forum:You cannot reply to topics in this forum
All-Terrain Lawn Tractor Forum :: General Tractor Talk + Pictures/ Videos :: General Tractor Talk-
Jump to: