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help with pinion??? (yokomo dib)

Posted: Fri Jul 13, 2012 8:03 am
by Malice
I need help, I'm stuck on the whole ratio thing and its winding me up!

ok specs

yokomo dib
yokomo 1.8 fcd
kawada 80t spur 38dp
tekin 7.5turn motor

what pinion size should i be running?? last night i ran on a track with a 34t pinion and the motor was getting hot... switched to a 90t spur and it was better but I'm running a 80t for body clearance...

can anyone help???

Re: help with pinion??? (yokomo dib)

Posted: Fri Jul 13, 2012 9:00 am
by FunkRenegade
Right now, you're running 3.0fdr. Way too high for 7.5t motor. For your motor and 1.8 rear end, you want to use the biggest spur you can fit on the chassis. 80t is way too small. 7.5t motor should be geared around 7~ 7.5fdr. There's a chart in the manual that shows possible spur/pinion combo to reach that ratio.

Re: help with pinion??? (yokomo dib)

Posted: Fri Jul 13, 2012 9:05 pm
by marshun
15 tooth!

im all about making my motor run as cool as possible. probably a preference. but i've had my motors for years. i use a 15 tooth and an 88 tooth spur. 2.0 or 100% cs

Re: help with pinion??? (yokomo dib)

Posted: Fri Jul 13, 2012 9:27 pm
by Dr.Fate
Okay I had that problem as well with 13.5! I went with 95t spur 18 combo with the 2.0 set up. Now I'm gonna under drive the front with a 40/14 F and 25/36 R. I seen some guy on youtube with a under driven chassis before with 10 degree castor blocks and it was sliding! Also I'm gonna do the FBD trick with the DIB.

Re: help with pinion??? (yokomo dib)

Posted: Fri Jul 13, 2012 10:05 pm
by Stalwart
Get the biggest spur to clear the body, and smallest pinion to reach the spur without filing motor frame. Calculate FDR, test drive, and you'll know what pinion you need

Re: help with pinion??? (yokomo dib)

Posted: Sat Jul 14, 2012 3:54 pm
by FunkRenegade
OP is running 1.8 rear end. 2.0 internal ratio doesnt apply here. There is no black magic about gearing. Every motor turn has an optimal gearing range. Find out and gear your motor accordingly.

Re: help with pinion??? (yokomo dib)

Posted: Mon Jul 16, 2012 12:03 am
by marshun
well i forgot to mention that my motor is an 8.5 turn brushless.

i use a 15tooth. its the lowest that is suggested for my motor. it said 15-20. but anything higher than 15 tooth and it gets hot after some time playing

Re: help with pinion??? (yokomo dib)

Posted: Mon Jul 30, 2012 1:22 am
by nevuz
I use the yokomo 2.0 fcd on my dib.
I currently use a 22T pinion and a 90t spur,but my motor(after a few minutes) is very hot
what pinion size should i be running?and the spur is ok?