*Kezar*

Hello rctech,i am glad to talk with you for one more time.
i need your help about the correct choose about spur gear and pinion gear.

right now i am owned 1 combo ezrun 8.5t Ezrun 4000KV
and i am playing with 2cell battery 5300mah
the speed isnt enought for me, and i need more.

the problem is the motor can handle from 36 pinion to 40+ or will be too much for it?


i am using the stock spur gear and pinion gear.
spur gear: 68t 48p
pinion gear 36t 48p

but as i say i need more top speed.

what u suggest me to do? what is better for me?
to change motor to 5.5t
or to change the spur gear and pinion gear from another car.but which one?

thank you all for the help i appreciate it.

sidecarphil1

iTrader: (1)

I would go into your local hobby shop and see what spur/pinion gears they have for you

It looks like your gearing is a long way out , i would go more allong the lines of 100 spur and your 37 pinion

most spurs and pinions fit all types of car

but check the temprature of the motor every 2 mins of running

*Kezar*

i run it with full throttle for 20 mins and when i check for temperature was 25celcium in motor and 20 in esc.

it supposed can play till 50celcium or i am wrong?

i was thinking to move it a lil bit long the gearing with only just 40t pinion from 36t.what do u think?
thank your for fast reply.
i was in local hobby shop but kyosho the min spur gear is 68t and pinion max 36 for 48p ofc i am talking.

sidecarphil1

iTrader: (1)

50 degrees C is a good safe temp Yes , but i think with the other gearing i sugested you will be safe and get more speed and fun out of your car ,

*Kezar*

so your opinion is just a lil bit long gearing?
like from 36 pinion to 40+? and thats all?

thank you.

sidecarphil1

iTrader: (1)

going from 36 to 40 will make the car a little quicker but not a massive amount

I have looked on Kyosho website and the spur gear is just the same as all the other universal spur gears that can be bought online or at a good hobbyshop , i would look into the gear range i told you in the 1st post

if your in doubt ask at another better hobbyshop

*Kezar*

aha i understand.
with a fast quick on that site
http://dhrc.rchomepage.com/RolloutCalc.htm

my stats its like that
my Final ratio i think its 4.72:1

wollow86

iTrader: (7)

The problem you might have here is the motor can't produce enough torque to get you going any faster. If you go to a higher fdr you might allow the motor to spin at a higher rpm, and have more punch at the same time.

*Kezar*

exactly.
that i afraid to do.. i am not sure if can handle bigger pinion etc. long gearing.

wollow86

iTrader: (7)

You want a smaller pinion, not a bigger one.

What I mean by higher fdr is say 5.5 instead of 4.5, this should allow the motor to get to its full rpm.

*Kezar*

Ok i got it.
i will test it to see what is going on.
or the next step is to buy 5.5t for tf5.

thank you all guys.

sidecarphil1

iTrader: (1)

Good luck with the car

i think an 8.5 can be very quick with the correct gearing