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Old 06-02-2008, 10:28 AM   #1
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Default Smoked two motors in a Rustler ??????? Need Help.

Hey Guy's

I've got a tech question for ya. My son runs a pretty stock Rustler in 1/10th offroad, and 1/10th oval. We were at the track yesterday and during the offroad session his Titan 12 turn 550 went up in smoke after about three minutes. We run a pretty decent size course with a loamy surface. He was running the stock XL-5 esc and stock Titan motor with an EP4600 matched pack. The drivetrain seems to be free of any binding.

I figured it was just a short and threw a 27 turn stock motor in so he could run the oval. Used an EP4200 matched pack for this run. The truck was running well, and his driving was spot on. He was a full lap up on everyone else and about four minutes into the run when poof, the 27 turn got completely barbequed.

A few guys at the track said the truck was geared too high, and a few said it was too much battery for the truck.

I checked the gearing and he was running a pretty tall 29/83. Is that the cause of all this meltdown?

I have to get him a new motor now and was going to run a 540 instead of the Traxxas 550. I could use some suggestions on choosing the right motor and gearing.

Thanks in advance for any help.
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Old 06-02-2008, 11:09 AM   #2
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The batteries are fine. I would say if the batteries were to powerful the esc would get smoked before the motor. No matter what the mah of the packs, the voltage should be the same.

I would say your gearing is way high, causing the motors to overheat and smoke. I am sure your son is a good driver but a full lap ahead of everyone else after 4 minutes is a good indication that his speed was greater than the other drivers, which could lean towards higher gearing.

Ask the other drivers what there gearing is, and buy your self a digital temp gun. Temp your motors, if there hot your gearing is to high, if the temps are low your gearing is to low.
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Old 06-02-2008, 11:29 AM   #3
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what was the mesh like? if its too tight it could melt the motor. and is the drivetrain free? could be a dodgy bearing...
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Old 06-02-2008, 11:47 AM   #4
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gearing sounds really high. if i were u i would go brushless
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Old 06-02-2008, 12:24 PM   #5
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The drivetrain is not binding, and the gear mesh is dead on. If in fact the pinion gear had far too many teeth would it cause the motor to fry like that? What's a good 19 turn motor to use without breaking the bank?

Thanks for the help guys.
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Old 06-02-2008, 01:06 PM   #6
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The gearing seems to be the cause of this. Way too much gear for the motor. You have to gear the truck to the motor you are running. Usually the rustler came with either a 86 or 87 tooth spur gear not an 83. I would suggest starting out with an 18 or 19 tooth pinion with the 83 spur when using an 19T motor. Then after running a few minutes check the temp of the motor. More than 200 is bad frying the motor. Change the pinion gear accordingly. To hot go down in pinion size. Surfaces with more traction will make more heat in the motor. It is all about load on the motor and you have to gear accordingly. Team Checkpoints 19T Money motor is a good motor to consider. It will go more runs between comm cuts than other 19T motors.
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Old 06-02-2008, 01:22 PM   #7
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Put a komodo 19t and gear it 86/19 . IMO
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Old 06-02-2008, 01:52 PM   #8
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stock pinion on that RC is 23 tooth, and many say that's even overgeared

so at 29 tooth, sounds like your kid put the "speed" pinion from the kit in there, and that's why it all burned up
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Old 06-02-2008, 03:18 PM   #9
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How much is too much for a brushless setup? I think you can slide into a VXL ESC/MOTOR combo for about $120 nowadays. 25/76 on that and he should be very happy! That is what my son is running. The 28t pinion seems to get the motor a little hotter than I like. Good luck!
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Old 06-02-2008, 04:29 PM   #10
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Thanks for all the help guys. I run a Rustler VXL myself and have thought about changing him over, but he wouldn't be able to race in his current classes then.

I'm going to pick him up a 19 turn and a couple pinions between 20-25 and see what happens.
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Old 06-02-2008, 05:20 PM   #11
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I think you should buy a bunch of those 19T motors if you are going to use pinions in the 20-25 range. User smaller pinions, especially for offroad and especially if your son is younger. Most kids I have seen racing only know about two speeds: Stopped and full throttle. Start with a 18T pinion.

Last edited by ta_man; 06-02-2008 at 09:34 PM. Reason: correct typo
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Old 06-02-2008, 06:53 PM   #12
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Why? Is an aftermarket 19 turn that much more powerful than the stock 12 turn? Or is it capable of much less stress than the stocker thus the lower gearing? Would I be better off buying a new Titan 12 turn?
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Old 06-02-2008, 06:59 PM   #13
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Nineteen turn motors are wicked fast, especially on dirt off road because of their bottom end power. I don't think the Titan is any way close to a 19T.

I like the Checkpoints because they do last a long time between rebuilds. I tried two Komodos and they required too much brush replacement and com cutting for my taste.
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Old 06-02-2008, 07:27 PM   #14
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You can get a Komodo Dragon 19t spec for under $30. They are fast and reliable. Also for the price you cant beat it. The pro version is un necessary, so save a couple of bucks.

The aftermarket 19t is faster because its a higher quality motor.
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Old 06-02-2008, 07:28 PM   #15
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Also try a 18t pinion first and adjust from there. Seriously though invest in a temp gun. You can use it on all of your esc and motors, and by not frying another motor due to overheating, it will pay for itself.
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