gearing options...

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Jgilk1

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what options are available to lower the overall gear ratio of the rampage mt??


i know mcd has or had a 24/36 main gera setup but what about options for reducing the other 2 gears on that mount?


what about a 20/30 setup over the 25/25


as well what about the mid diff and f/r diffs??? front and rear diffs from what i can tell are 16 12 and the central diff is what 10 and 30????


mid diff is what???


and what is the standard rampage mt end gear ratio???


what i am looking for is info more then any thing i am looking to get 1/5 scale but i want to gear it low enough for some decent off roading (not full scale rock crawling) and well after trying out a 5b, 5t, tt, and a mg murader (yes i know out of those only 1 was 4wd) but there all geared imho for racing and not what my intended purpose would be.... can any one help me out? or point me in a direction other then in a circle lol


my goal would be a top speed of around 12-15mph @ full throttle if @ all possible i will most likly be running a honda gx35 (better flatter torque curve) the honda motor would get a straight pipe (gx35 is a 4stroke)


http://www.honda-engines.com/engines/gx35.htm (a straight pipe over the emissions bullshit should increase the revs by 250-300rpm+ as well as running race fuel)
 
Last edited by a moderator:
yeah thats the problem of why im asking about gearing options


for everything beings that the stock gear ratio is 12.6:1


if i could get that down to 8.5:1 i wouldn't have a problem running any motor that and the gx35 clutch kicks in @ 4k rpm where as most any 2 stroke has to kick in around 6-8krpm...


i guess im not really explaining what i want ... aarg...


and my other question is how in the world did redcat come up with the "gear ratio" of 12.6:1???


i have set here for hours trying to figure it out


i mean if i dropped to a 20a/40b and 20c/30d (looking @ custom fabrication here...)


0.5 + 0.66 = 1.21 verses the stock 1.74
 
Last edited by a moderator:
yeah thats the problem of why im asking about gearing options


for everything beings that the stock gear ratio is 12.6:1


if i could get that down to 8.5:1 i wouldn't have a problem running any motor that and the gx35 clutch kicks in @ 4k rpm where as most any 2 stroke has to kick in around 6-8krpm...


i guess im not really explaining what i want ... aarg...


and my other question is how in the world did redcat come up with the "gear ratio" of 12.6:1???


i have set here for hours trying to figure it out


to achieve gearing for 12 mph i have to know how redcat calculates the overall gearing....


@ most with the transmission center diff and front and rear diffs i only come up with


(transmission)


25/35 = 0.71


25/25 = 1


CENTER DIFF


30/10 = 3


front rear diff


16/12 X 2 = 2.66 (or 1.3333 i don't know if you add the final ratio of the front and read diff together)


but thats still only a gear ratio of 6.04 or (if add front and rear diff = 7.37)


yes i understand how gear ratio is calculated .... so to achieve a speed of 12mph i would need a gear ratio of.... idk
 
Last edited by a moderator:
You'r almost ok in the calculation form.


Center diff is 10/30 = 3


Rear/front diff 11/33 = 3


outer ratio 25/35 = 1.4


Inner ratio 25/25 = 1


Formula is simple, 1 X 1.4 X 3 X 3 = 12.6:1


Next time you can replace all the diff ratio by 9:1 and skip any 1:1 ratio.


1.4 X 9 = 12.6
 
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