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iTrader: (23)

so i have a sedan that currently has a stock motor (27t) in it. when i opened my package that my novak 13.5 was in i noticed it said "gear 1-2 pinion teeth lower than a 27t motor" would this be correct in my situation. also im in the process of buying an esc for the car, what do you recomend?

btw...400th post!

skypilot

iTrader: (14)

assuming your gearing your brushed stock around 6.8 to 7.2...

IMO each motor has a gear where it runs best, period, big track, small track all the same gearing start around a 5.0 go down from there depending on performance and heat.

a_main_attendee

iTrader: (2)

If it's a sintered rotor, you should be gearing around the 4.5 range in terms of FDR. To me 1-2 teeth less sounds like the car would be WWWAAAAYYYY undergeared. It depends though, what is the car it is being used in, the power source (i.e. nimh or lipo) and what you want the car to do. Undergearing it won't hurt that much, but if its too far undergeared it may damage the motor. Just gear the car and then drive the car, and don't take the motor temp above 170.

But if you can, start at about a 5.0 fdr and see if it feels undergeared. if it needs more, add more, but watch the temp.

A good cheap ESC would be the novak XBR or even the losi Xcelorin sensored. Good luck.

yokemad

Please be careful cos overheated brushless motor winds can melt and that means the end of story!!!

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iTrader: (23)

now i know nothing about gearing at all i have absolutly no clue about how to find the correct pinions for the motors. i currently have a 48 pitch 84t spur with a 25t pinion for my 27t. so what pinion size should i aim for. all the help is appreciated!

shadow102

iTrader: (21)

What kind of of car is it?

not home

iTrader: (23)

its a tamiya ta05ms, and i lost the manual for it just if you might have wanted to know guys

shadow102

iTrader: (21)

Since i am not real familiar with 48pitch gearing i am not sure what gears to suggest. If you switch to 64 pitch a 96t spur and 48t pinion will put you at 4.5 FDR on the nose

BTW assuming you have the same trans ratio as a regular TA05 your car ratio is 2.25

skypilot

iTrader: (14)

go to your hobby shop/race track where you bought the motor and ask them to help you,

or www.gearchart.com easy to navigate and find what your looking for

Grizzbob

iTrader: (2)

I'm also not sure what your outdrive ratio is(though it could be 2.25, the way to verify it is find out how many teeth you have on the diff pulleys & divide that by the number of teeth of the center pulley{which could be 36t diff pulley / 16t center, = 2.25}), but if what I mentioned is it, then you just take the number of spur teeth, divide it by the number of pinion teeth, & multiply it by the outdrive ratio. So say if you have a 72 tooth spur, if you use a 32 tooth pinion then you'll get a final drive ratio of about 5.06(72/32x2.25=5.06), & for some tracks that may get you in the ballpark....BTW, do you race at S & N's Trackside Hobbies? If so, then I'd gear taller than that, maybe try a final drive of about 4.6(that's around what I've run there for the Novak Race with a 13.5 motor)....

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iTrader: (23)

yah im from trackside

Grizzbob

iTrader: (2)

Kinda thought you might be, in that case start with an FDR of about 4.6, & you might even need to go taller(for the Novak Race, many of us have gone as tall as 3.9 on that track, the backstraight & sweeper & generally sweeping nature of Scotty's layouts make it easier to gear it tall).....

not home

iTrader: (23)

yah, scotty said i should start somewhere around 4.5 ish and work with it there. he said i should lower my spur to 69 and like a 33 pinion he guessed.

chuckharrisjr

iTrader: (30)

This may be a stupid question, but what is the difference if I were to run a 69 spur and a 33 pinion or a 73 spur and a 35 pinion? The reason I ask is because they both end up around a 4.18 on my tc5? Is there a difference?

rocket-mtrsprts

iTrader: (1)

Larger spur = quicker initial acceleration
same final gear ratio = same top speed