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Toyotatrucks83's Avatar
"Experienced user"
Toyotatrucks83 - 10.29.12, 8:21 pm Post #1: | Reply With Quote
I know questions about speed and gear ratios comes up here. Here is rc calculation calculator.


http://scriptasylum.com/rc_speed/top_speed.html

The transmission gear ratio is 2.64
The stock spur is 87.
Torment tires are about 4.25"
Curcuit tires are about 4"

*this only works for brushless motors with a kv rating for the motor.
"Experienced user"
kal1fornia - 10.30.12, 2:29 am Post #2: | Reply With Quote
what about the rear differential gear ratio?
Toyotatrucks83's Avatar
"Experienced user"
Toyotatrucks83 - 10.30.12, 5:24 am Post #3: | Reply With Quote
Just put in a 1. The rear diff is part of the transmission gear ratio.
"Experienced user"
kal1fornia - 10.30.12, 6:12 am Post #4: | Reply With Quote
ok cool thats what i put...
IonicRipper's Avatar
"Experienced user"
IonicRipper - 10.30.12, 6:56 am Post #5: | Reply With Quote
According to this my Torment should do 38mph... Interesting.

Only thing i wasn't sure was the kv rating of my Titan 12T. Any ideas?
"Experienced user"
torquelover - 10.30.12, 7:06 am Post #6: | Reply With Quote
Wow that's cool. I put in my specs, added 0.5" for tire ballooning (guesstimate from onboard vids I made) and it spit out 49.25 MPH. My Torment radars at 49-50 MPH.
Toyotatrucks83's Avatar
"Experienced user"
Toyotatrucks83 - 10.30.12, 1:34 pm Post #7: | Reply With Quote
Glad you could verify torquelover. I don't have a radar gun.
el_tonto's Avatar
"Unexercised Peer"
el_tonto - 10.30.12, 1:44 pm Post #8: | Reply With Quote
IonicRipper said
According to this my Torment should do 38mph... Interesting.

Only thing i wasn't sure was the kv rating of my Titan 12T. Any ideas?
I've read 22000 to 23000rpm at 7.2V for the Titan, so that makes it around 3125KV.
IonicRipper's Avatar
"Experienced user"
IonicRipper - 10.30.12, 6:27 pm Post #9: | Reply With Quote
el_tonto said
I've read 22000 to 23000rpm at 7.2V for the Titan, so that makes it around 3125KV.
Thanks, i got a more realistic figure: 24mph
Dparker818's Avatar
"Experienced user"
Dparker818 - 12.20.12, 11:20 pm Post #10: | Reply With Quote
Whats the kv o the 15 turn dynamite motor ? Thanks
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