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Old 04-12-2013, 06:44 AM   #21
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Ok just checking i packed it with grease too, i think the chassis amplifies the noise also, i triple checked how everything meshed and it's all smooth so I guess I'm good to go.

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Old 04-12-2013, 10:05 AM   #22
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Default Re: gru units

Yes, the HPI is quite a bit noisy. The RC4WD unit is very quiet in comparison.
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Old 04-12-2013, 10:49 PM   #23
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Default Re: gru units

I have installed about 3 HPI GRU, in my various CC01 chassis over the years. Mainly because the cost to import the RC4WD GRU to South Africa is so high. With shipping it costs $75.

So I only have the HPI GRUs as a reference, but out of my 3, and my mates 2, we had 2 that where very noisey. And no matter how much grease you pack into them, they don't change. You have to run them for a while (5-6 hours) until they run in. Then change the grease, and they get better.

I mated a 20 turn Axial motor to the HPI GRU with great torque and wheel speed.
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