Crawl ratio for sand, trail and mud?

[randyb12]

I am tired of all the you have to have 125:1 or more comments from all the rock crawlers out their.
What is a good ratio for a full size with 46 Baja Claws?
I have a 3 speed auto and a 396cid putting out over 400hp /tq.
currently it has 12:1 in Hi range and 25:1 in Low.
It is still under construction and I have never ran a combo like this so I don't have aany thing to relate it to.
thanks.

 

[short sub]

well i have an ord doubler- 513s- and 39" boggers. Its not nearly as low as some rigs but it does the job. I do alot of muddy climbs along with sandy terrain and while doing so i just run the 205 in low. Not sure of its ratio with my 513s factored in but its not all that low and i like it. Of course the key to sand and mud is WHEEL SPEED so u dont need all the lower gearing.

 

[randyb12]

Thanks, Anyone out there running 46+ tires in a rig setup like mine?
What do you think of your gearing?

 

[Corey 78K5]

Hey Welcome to the site. Cool We have another Humboldt county member I'm just south of You in Redcrest and 81jimmyslt is also in Eureka.

 

[Greg72]

Another idea is to try for 1" of tire rotation per 1 RPM of the motor.

In simplest terms, figure out the circumference of your 46" tire and then try to achieve a crawl ratio that matches it.

Ex.
My 38" tires are ~121" circumference, so my crawl ratio should be close to 120:1


More discussion about this strategy is here:

http://coloradok5.com/forums/showthread.php?t=28614&highlight=ideal+crawl






There is no ONE ideal ratio for every kind of terrain. The key is building a setup that has gearing options (why Doublers are great) so that you can adjust your crawl ratio to the conditions.

 

[randyb12]

Hey Welcome to the site. Cool We have another Humboldt county member I'm just south of You in Redcrest and 81jimmyslt is also in Eureka.

Cool, Where do you guys go to wheel?
We do the beach and rivers mostly but are looking for some other stuff to do around here when the truck is done.

 

[randyb12]

Another idea is to try for 1" of tire rotation per 1 RPM of the motor.

In simplest terms, figure out the circumference of your 46" tire and then try to achieve a crawl ratio that matches it.

Ex.
My 38" tires are ~121" circumference, so my crawl ratio should be close to 120:1


More discussion about this strategy is here:

http://coloradok5.com/forums/showthread.php?t=28614&highlight=ideal+crawl






There is no ONE ideal ratio for every kind of terrain. The key is building a setup that has gearing options (why Doublers are great) so that you can adjust your crawl ratio to the conditions.

Thanks, I am tring to figure out if I need that high of a ratio for your average mud and sand/river terrain. I have the feeling with the tires I have I will always be in low range. I think a KloonV is in my future. I have a divorced ford (in a quiet voice "I own a ford") NP205 so the standard doubler is out of the question.

 

[Corey 78K5]

Cool, Where do you guys go to wheel?
We do the beach and rivers mostly but are looking for some other stuff to do around here when the truck is done.

Pretty much the same for Me. Problem is I have been redoing My K5 for about the last three years. Still a little more to go until it's road worthy. Also building a 76 3/4 ton. Let Me know if there are any parts Your looking for I always have stuff poping up.

 

[randyb12]

Pretty much the same for Me. Problem is I have been redoing My K5 for about the last three years. Still a little more to go until it's road worthy. Also building a 76 3/4 ton. Let Me know if there are any parts Your looking for I always have stuff poping up.

Thanks I will keep that in mind.

 

[FWP]

Interesting question. I would think crawl ratio is of no concern in the sand/ mud. IMHO it's all about HP to weight ratio. I know my crawler sucks in the sand... ie. Big tires, heavy pig, low gears = going nowhere but down

 

[randyb12]

Interesting question. I would think crawl ratio is of no concern in the sand/ mud. IMHO it's all about HP to weight ratio. I know my crawler sucks in the sand... ie. Big tires, heavy pig, low gears = going nowhere but down

Well, big tires really tall gears and a heavy rig will sink too. I am looking for the middle ground. What to expect from my current ratio and what would be best for what I want to do.
Thanks.

 

[FWP]

Middle ground will be tough. Ask Springer (Amigo #1) I seriously doubt you can have your cake and eat it too. Kudos to you if you make it happen . I have yet to see it done in anything over 4000 lbs. Good luck dude.