Slow down

trackman · #1 10-24-2009, 10:17 PM

I would like some input on slowing my 1/10 scale off road trucks down.

It seems that many ideas come to mind but what would be the best?

#1 Gearing down; Stock gears are 88/20 , biggest gear could be a 90t with a 15t pinion. I have tried it and it seems that it is hard on the diff gears and ends up stripping the diffs.

#2 Charging batteries at a lower amp for a slower battery charge.

#3 Less Battery cells per pack. The stock esc in the trucks require 6/7 cells and would require me to buy new esc's that could handle 4 or 5 cell packs.

#4 More turns in the motor. Stock truck comes with a 20t single , while we stepped to some name brand stock 27 turns they were actually as fast or faster than the stock 20 turn that came in the truck.

#5 What if I were to try some 35 or 50 turn rock crawler motors?
Would this allow me to use the stock esc (rated at 20turn 6/7 cell) with the required 6 cell packs with some gear mods (between ratios as listed above in #1)?

Reason for these slowing downs are to give some kids oppurtunity to do some raceing in groups that are not as lucky as most and actually to do it without destroying my trucks. The stock trucks normally run about 20 to 25 MPH and I am looking for about maybe 10 to 15 MPH.

inferno · #2 10-24-2009, 10:39 PM

gearing down, you said 15t spur, i think you meant pinion?? i would try the highest spur and lowest pinion, and a 7.2v battery pack, never really thought about slowing down....lol, or set throttle lower on radio (depending on radio). or just buy parts for you cars so you can replace when break...lol

trackman · #3 10-24-2009, 10:51 PM

Quote:

Originally Posted by inferno

gearing down, you said 15t spur, i think you meant pinion??

Correct, pinion was intented.

Not many try to slow down, but as you said radio adjustment was a consideration but not enough to do the job. Even thought about jammin /blocking the trigger to limit the speed. But they seem to figure that one out and before you know one starts zooming around the track faster than the others. Dang Monkeys.

inferno · #4 10-24-2009, 11:02 PM

lol, put road tires on, and let them race on the dirt, that will slow-em down...lol

KDarc · #5 10-24-2009, 11:14 PM

I started my kids with 90spurs and 12 pinions with 4 cell packs I had from the winter carpet season. I also took some stock motors and put non silver brushes with soft springs on them. This also helped take the torque and wheel spin away so they could drive the trucks straight. I also adjusted steering travel out of the radio's to help with them sawing the wheel back and forth. Good luck and thanks for doing this for these kids!

Hick · #6 10-24-2009, 11:16 PM

Try these, Spec Motors for Legends Class:

http://www3.towerhobbies.com/cgi-bin...?&I=LXNL80&P=7.

Ooops! They have gone up in price.

Or something along these lines which are a little bit cheaper;

http://www3.towerhobbies.com/cgi-bin...RS++&search=Go.

I maybe talking out of turn, but my limited experience with these motors, these motors just aren't that fast. These or something similiar came in my first car, a Chevy Stadium Truck.

***hankster*** · #7 10-25-2009, 12:15 AM

You can turn down the throttle end point on the transmitter so you only get about 1/2 throttle when the trigger is fully pulled.

CClay1282 · #8 10-26-2009, 05:46 PM

Quote:

Originally Posted by hankster

You can turn down the throttle end point on the transmitter so you only get about 1/2 throttle when the trigger is fully pulled.

Thats if he has a computer radio.

This would be the best option if your radio has that available.

trackman · #9 10-26-2009, 09:06 PM

Quote:

Originally Posted by CClay1282

Thats if he has a computer radio.

This would be the best option if your radio has that available.

That would be nice if I had that option but I don't think my radio's have EPA.

Is EPA available only on computer radio's?

CClay1282 · #10 10-26-2009, 09:11 PM

Usually. On some though there is a little dial.

trackman · #11 10-26-2009, 09:30 PM

I have duratrax Evaders ST's and the RTR radio systems.

The radio's have 3 knobs on the top;

#1. The back one is " D/R " , I think that one limits the steering for more or less.

#2. Then the next one is " ST.TRIM " , I think this one adjusts the steering for straight or slightly steer left or right.

#3. This one is " TH.TRIM " Now this knob can actually be turned and make the car go backwards or forward without even mashing the trigger.

These trucks do have a programmable ESC that came with RTR trucks.

Maybe this can help out in the speed adjustment ?

Does number 3 sound like a EPA or is it just an adjustment drag knob or something?

CClay1282 · #12 10-26-2009, 09:57 PM

The third one is just the center point adjustment for the throttle. You dont have an EPA adjustment. I would say a higher turn motor might be your best bet. One of the trinity spec motors like posted earlier would be a good buy probably.

shintastrife · #13 10-27-2009, 03:55 PM

i would say chage the gears and put smaller batterys in them like a 1800mah

the d/r nob i think that might be like a F or R power to where you can give more power to going for word or back words. i say play with the nobs and see what they do.

trackman · #14 10-27-2009, 05:33 PM

Quote:

Originally Posted by shintastrife

i would say chage the gears and put smaller batterys in them like a 1800mah

the d/r nob i think that might be like a F or R power to where you can give more power to going for word or back words. i say play with the nobs and see what they do.

Yes the gears have been changed from a 88 spur /20 p to a 90 spur /down to 15p, Even tryed a 93 spur ( have to mod the gear gear cover for that ) ,

Still though part of the problem with that is to much tourqe and eventually strips the diff or idaler gears.

Far as smaller battery mah ; that has nothing to do with the speed , that's for the run time, where as the number of cells used can make a difference but the stock esc's have a requirement of 6 to 7 cells.

Really no need to play with the knobs as I do know that the D/R and the ST.TRIM are in reference to the steering and the number 3 knob was in question until I was informed that is just a center point adjustment ,

But thanks for the input.

shintastrife · #15 10-27-2009, 05:56 PM

take the cover off, i run my ext with out one. try backing off the spring on the spur if its like the ext that will slow it down but it will all so eat the slipper pad up to. but there like 2-3 buck here for 2 of them. that will lessen the tourqe. all so try backing the screws off about a 1/4 turn on the gear box so they can spin more freely or just up gread to bearing as well.

i run a 5.5 t brushless in my ext, and the idel brakes more then any of them. but im running a 85sp and 32p i think. i know the pion is right.