Increase speed from 40 to 80mph

[Routy]

hey i apologize for my last post after readin it i realize it went a little far my bad hope nobody took offense

 

[brendonv]

can u image the mess a chain puting out that much power clopping u in the back of the head at 80mph

More like the chain coming off and wrapping around the hub locking up the rear wheels. That would be scary. Or a blow out.

 

[RedLine Go Kart]

I got a 17 hp specialized motor and ive topped it at 74 mph its on a customized frame the stock frame couldn't handle it lol

 

[Routy]

lucky lol

 

[bullrider700]

I do 70 in my little buggy. It's fun as hell! And I do 80 on my quad on off road drags! If you just learn how to drive those speeds are fine. You need that much speed if your looking to make some decent jumps! It's just hard to keep the kart in tact when your doing 30 to 40ft jumps. I sold my speed kart and now have a 13hp little dune buggy. I am wondering what all I can do with little knowledge to soup this harbor freight 13hp engine? Looking for cheap easy mods! And what kinda gearing should I use for big tires. It has a torque converter.

Thanks guys! This site is very helpful!

 

[anderkart]

Bullrider, you should start your own thread with pics (if possible) and also include the diameter of your old/new rear tires, and also the # of teeth on all your sprockets... Then we'll hook you up dude

 

[redsox985]

70 in a buggy?! Woah! What did you clock it with? And upgrading that GreyHound may not be worth it.

 

[mjstutter12]

easy as pie

if you dont have a jack shaft get 1 small 10t from motor and 60t to rear end and you will move but you will also break **** going that fast. my buggy i made a week ago goes 60 and climbs nicely
mabey its the harley motor eather way

 

[Odonnellp24]

Also, rule of thumb, to double speed, quadruple power.

Actually when you double speed resistance losses quadruple and you need 8x's (2e3) the power.

Speed only accounts for 2 dimensions.......distance/time

Power is a measure of work performed in a given time or for those academically inclined force x distance /time. 3 dimensions.

In a balanced system friction losses will equal acceleration forces giving you a vehicle traveling at a steady speed which only requires a certain amount of power. Let's assume your kart has 4 (2x2) square feet of surface area directly opposed to wind. To double your speed your kart will be pushing that air twice as fast effectively doubling the dimensions of your exposed area (4x4 or 16 sq ft). So comparatively your area increased by a power of 2.

Power=force x distance / time
or
power=force x speed
so therefore if force (wind resistance) raises by a power of 2 and speed increases by a power of 1 (doubles) you add the exponents and reach the solution that power required is cubed. In this case. It would be 2 raised to the 3rd power or 2x2x2 which is 8.


Think about a NASCAR with 800 hp that tops out at 200 mph and compare that to a family car that uses maybe 100 hp to go 100mph.

 

[Screendoor]

I can see why you would want to go 80 in a kart. We might have the same mentality. I always ask "how fast will it go?" I think you will find more enjoyment out of your kart (which is very nice BTW) if you leave it the way it is. My yard kart does a little over 40 and honestly it is a bit dangerous but it is so much fun. I personally like to be able to ride on the edge but still keep control. You have a great kart man. Just fine tune it from where your at and I think you will be rockin on that thing.