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Old 2019.01.27, 10:30 PM   #1
ghost chili
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PN Racing 43t motor

Just looking for some confirmation about the PN Racing 43t ball bearing motor. I am pretty sure it should be safe to run with the unmodified FWD electronics? I've been running the 50t BB motor and I'm looking for a little more speed. I read somewhere the FHSS electronics package on the MR-03 and MA-03F had been improved to be able to run hotter motors? What kind of motors are you guys running?
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Old 2019.01.27, 11:12 PM   #2
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You should be fine running this on the FWD electronics. The RPM is lower than with a 50t, but torque is higher. For similar speeds, you would need to have a higher gear than the 50t. There is a higher static magnetic field on the 43t with use of neo magnets in the can, where the 50t uses earth magnets. This provides significantly higher low end torque. Which might be more than the diff/swingshafts can handle. The 50t would be more linear and a flatter power curve.

I dont have a FWD, but used the motor in AWD and like the feel of it for that application. 50t has a feel of a 70t with a longer power curve, where 43t has similar gearing choice to the 70t but loads of lower range torque.
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Old 2019.01.28, 08:25 AM   #3
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That was super informative, thanks! Do you know the lower limit for turns the FWD can run? I'm kind of leaning towards a motor with higher RPM since the FWD has limited traction compared to the AWD or RWD so I think the additional low end torque would be wasted. I am still running the stock diff and driveshafts, but I am hoping the reduced traction would spare them any damage.

I'm not well-versed in motor tuning nor the science behind it, but if I am understanding correctly, a stronger magnet will reduce max RPMs, but increase torque and vice versa? So if I tinkered with a 43t motor by keeping the armature and replacing the neo magnets with weaker earth magnets, it would result in possibly higher RPMs than the 50t motor?
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Old 2019.01.28, 09:02 AM   #4
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You would get higher RPM at the expense of amperage drawn and heat. It would not be worth it, just gear the 43t to the highest gearing... what are you gearing the 50t at?

Having studied the data on the fet used with the rwdŕfwd electronics, it is roughly 3x more current capability and lower resistance than the ASF brushed fet. They use two of these in each charnel on the drive circuit on the ASF cars, which places the rwd/fwd capacity for amperage about 1.5x the ASF electronics.

This data is purely the fet, I am not an electronics engineer, and can not say whether the are other limiting factors in the board design.

As you go lower in wind, rpm and the torque curve flattens. The amperage draw also increases. I have no knowledge of the gearing options for this chassis, but would think that a 39 or 37t would be a happy medium in general.
33t is very flat
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Old 2019.01.28, 10:58 AM   #5
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I am running the 50t motor at a 5.97:1 ratio (17t pinion 29t spur). With fresh batteries, the FWD spins its front tires easily even on carpet and with Kyosho 20 degree soft slicks. Lowest gearing available is 7.23:1 (15t:31t) and tallest is 4.50:1 (21t:27t).

Here is the manual for the FWD with gearing options on page 34:

http://www.kyosho.com/jpn/support/in...FWD_T01_IM.pdf
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Old 2019.01.28, 07:01 PM   #6
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I would try gearing up before thinking about a new motor if you're spinning tires already. Fastt motors are going to spin them even more
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