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Old 08-22-2007, 02:40 PM   #1
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Cool Can u hear your buggy Spur?

hey, i have a ftb4, and i was wondering how u guys figure out your exact gearing ratio, mainly i go to www.rc10.com and look at some of the drivers set up's from races. Im runnin a 12x2 mod, and i think cavileri was running that in one of the posted races, so ive been taking the gearing off of that and using it, however i would like to know, how to go about choosing the right gearing myself?

okay any suggestions would be greatly apprecieated!


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Old 08-22-2007, 08:07 PM   #2
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it depends on how big your track is, do you know the demensions?
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Old 08-22-2007, 08:45 PM   #3
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usually cant go wrong with 7,8 or 9 over the wind. 12 turn run 20 or 21 pinion. spurs usually ran the stock one. I havent had an electric car in so long I cant remember if it was an 81 or 82 I know there is also an 84. but in my opinion run the 81 or 82 whichever it is and around 8 or 9 over the wind.
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Old 08-22-2007, 09:02 PM   #4
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I run a 7.5 R and I can hear it a little. Stock you shouldn't have that problem.
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Old 08-22-2007, 09:10 PM   #5
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My bearings made me think my spur was going bad. Waiting on a new set of Avid Revolutions to put in there and it should be good. For gearing, going off of what the manual says to use is probably the best way to start from, and then if you are getting consistent, but need to go a bit faster, go up one or two teeth, and see how your motor and esc are doing, and also if your battery can last the full race.
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Old 08-22-2007, 09:24 PM   #6
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I have heard 2 theories on figuring your own gearing out...

Theory #1 - gear for the straightaway, you want your car to top out just short of the end....10 feet or so.

Theory #2 - gear for the biggest jump you want to clear, you should be able to start from a dead stop, 2 or so feet from the base of the jump and still clear it.

I use theory #1 in stock, and theory #2 in mod. I used to do theory #1 in mod, but found it much better when using theory #2.

But the question is where do you start? Find the fast guy at the track and start there...if 21/81 is what the fast guy is using, then use it. Adjust up or down based on your "feel" of the car on the track. Need more punch to come off the corner or clear that tough double, drop a tooth or 2. Too much wheel spin, not enough speed, go up a tooth or 2.
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Old 08-22-2007, 09:47 PM   #7
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jk racing,

Great info. I will try this at my local track.
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Old 08-22-2007, 11:23 PM   #8
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Quote:
Originally Posted by XXXCRRacer View Post
I will try this at my local track.
I run @ SoCal occasionally also. Havent been in a while though, need to make a trip over there. I think I was running 20/78 with an 11X1 V top motor. Ballistic fast and tons of punch...that was before brushless
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