Wirralnitronoob Posted August 31, 2015 Share Posted August 31, 2015 Right so my 50t spur got chewed up,this was on a 16t pinion and it was fast,ive got a new spur off a friend and this is 54t, its still pretty nippy but i noticed a big decrease in speed,i have a spare 13t pinion that is the right pitch for the spur,eould this be a better option do you think,? Before i start taking the car to bits again lol Any info on spur and pinion sizes,and speeds would be greatly appreciated as it just seems to vaffle my head lol Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
everclear1984 Posted August 31, 2015 Share Posted August 31, 2015 4 teeth up on the spur is roughly equivalent to 2 down on the pinion. If temps cool before you changed the spur the 13t pinion should be fine. Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted August 31, 2015 Author Share Posted August 31, 2015 Okay ill give it a try,cheers everclear Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Shudson Posted August 31, 2015 Share Posted August 31, 2015 No. It will make it worse! Divide the spur by the pinion and it will give you a ratio of pinion to spur. Original setup of 16t to 50t gives (50/16) 3.125. So Spur will complete one turn for every 3.125 turns of pinion. 16t to 54t gives 3.375 and 13t to 54t would give you 4.154. Consequently, for a given motor speed, the 13t pinion would turn the spur slower. Assuming that your original gearing was "right", the car is going to be very significantly slower (25/30%) with the smaller pinion. 2 Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 1, 2015 Author Share Posted September 1, 2015 No. It will make it worse! Divide the spur by the pinion and it will give you a ratio of pinion to spur. Original setup of 16t to 50t gives (50/16) 3.125. So Spur will complete one turn for every 3.125 turns of pinion. 16t to 54t gives 3.375 and 13t to 54t would give you 4.154. Consequently, for a given motor speed, the 13t pinion would turn the spur slower. Assuming that your original gearing was "right", the car is going to be very significantly slower (25/30%) with the smaller pinion.thanks for that mate it sorta simplifies it abit for me but still head baffling lol,ive just orderd a new spur and pinion but was looking at more, if i have a 50t spur with 32 pitch or 0.8 what would be the correct pinion to use with this running an ez run hobbywing 3400 kv motor and an wp sc8 esc,? Thanks guys Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 1, 2015 Author Share Posted September 1, 2015 Can anybody point me in the right direction of pinion and spur that i will need running this motor please Sent from my iPhone using Tapatalk Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 2, 2015 Author Share Posted September 2, 2015 Sombody out there must know this lol Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
big turbo Posted September 2, 2015 Share Posted September 2, 2015 What is the combo going in ?? Bigger pinion = slower acceleration and more top speed. Smaller pinion = faster acceleration and less top speed. Smaller spur gear = slower acceleration and more top speed. Bigger spur gear = faster acceleration and less top speed. As for gearing suck it and see, start of with stock gearing and go from there. But you will need a ir temp gun to monitor temperatures. once you know what temps your getting adjust the gearing as follows. hot motor + cool esc & batt = undergeared cool motor + hot esc & batt = over geared warm everything = just right hot everything = way Overgeared Try and keep the motor under 180f Esc keep under 140/150f And lipos keep under 120f That's the higher end of the scale, ideally all temps should be less, a warm setup is a happy setup. 1 Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 3, 2015 Author Share Posted September 3, 2015 What is the combo going in ?? Bigger pinion = slower acceleration and more top speed. Smaller pinion = faster acceleration and less top speed. Smaller spur gear = slower acceleration and more top speed. Bigger spur gear = faster acceleration and less top speed. As for gearing suck it and see, start of with stock gearing and go from there. But you will need a ir temp gun to monitor temperatures. once you know what temps your getting adjust the gearing as follows. hot motor + cool esc & batt = undergeared cool motor + hot esc & batt = over geared warm everything = just right hot everything = way Overgeared Try and keep the motor under 180f Esc keep under 140/150f And lipos keep under 120f That's the higher end of the scale, ideally all temps should be less, a warm setup is a happy setup. thank you very much mate that has simplified evrything with gearing now for me thanks,the system will be going into a stampede 4x4 aswell mate Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
big turbo Posted September 3, 2015 Share Posted September 3, 2015 My lad has a son uva a digger with a leopard 3900kv motor and sc8 esc and it's geared 17/90 and it does not get hot. Your hobbywing can is longer and 4 pole so will have more torque then his so 19/90 to 21/90 should be about right. 1 Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 3, 2015 Author Share Posted September 3, 2015 Cheers bt i will look at buying some 90t spurs and some pinnions ranging from 19t to 21t Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
big turbo Posted September 3, 2015 Share Posted September 3, 2015 Just check that it is .32 and not 0.8 mod. I forgot to ask what voltage will you be using? If its 3s you will need to gear it down. Quote Link to comment Share on other sites More sharing options...
Wirralnitronoob Posted September 3, 2015 Author Share Posted September 3, 2015 Yeah mate ive checked and the pitch it 32 i only use 2s lipos at the moment aswell mate so like u say it should be okay,,until i decide to up it to 3s Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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