challenges with my x6 please advise

[samboneecanada]

Hey all, thanks up front for the help,

I have an x6 on a rough loose track. the straight is about 110' long and it's quite technical
http://video.google.ca/videoplay?docid=-6452076809636839237&hl=en-CA (http://video.google.ca/videoplay?docid=-6452076809636839237&hl=en-CA)


I have put in the purple losi 84t spur to try in with the stock motor that I have. I'm a bit confused with the whole thing dealing with ratios etc/...

I have access to other size spurs and pinions. I just am a bit lost. I've cooked a few motors already.

Another thing is that I saw a xxxbk2 yesterday that was flying with a 27t stock.

thanks

[jimmy]

I'd say you need a smaller - not bigger spur, with your stock motor as it could be under geared?.
What pinion are you running?

[Chrislong]

Hi,
Ok the formula to use is: Spur / Pinion x 2.6

So for 81 spur with 21 pinion, that gives (81/21x2.6) = 10.02:1

This means 10.02 revolutions of the pinion = 1 revolution of the wheel&tyre.


Therefore: a torquey motor such as your stock, requires less turns of the pinion to drive the car forward by one turn of the wheel seeing as it has more power. So perhaps gear this on 81/24 or 25.

If you run a revvy motor which screams, chances are the torque is low, so you have to gear this with a smaller pinion as it will need to be made to rev faster to get the best from it.

Finally, im suprised you have managed to make the 84 tooth Losi sput fit, I am guessing you have had to dremel the chassis and the dogbone pins and the clearance is still tight at the outdrives. I run an 82 Losi spur so I can get low enough ratios with brushless, and for this I have had to dremel the chassis slightly too.

Chris

[samboneecanada]

I don't know exactly which spur it is. it's purple and it's really close to the dog bone ends (which I have dremelled).

if it were undergeared wouldn't it be super torquy? it was almost sluggish. maybe it was a crap motor.

So what should the final gear ratio be on a dusty hard track?

I'm thinking of running a 14x1 because that's all i have. the other option is to get the checkpoint money motor and use it. it's done well at my track.

thanks again for your help

sean

[YoungChazz]

I suggest you use whatever spur the B4 guys at your track are using, then gear just as they do. All the ratios are exactly the same with the X - 6 as with the B4.

[samboneecanada]

thanks