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Old 12-12-2009, 01:07 PM   #1
Join Date: Nov 2009
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Default Hyper 8 Pinion


I've converted a second-hand Hobao Hyper 8 to brushless, but I need a pinion for the motor. Does anyone know what Mod the spur gear for the Hyper 7/8/8.5 is? It's bigger than Mod 0.8, but is it 1.0, 1.5...?

Also, to anyone who is running a brushless Hyper, what would be good gearing to get around 55-60mph? I'm not sure how many teeth the spur gear has though. How many teeth should I be looking for on the pinion, round abouts? I'm running 6s w/ the MMM 2200 combo.

Cheers for any help, and sorry for the (sort of) vague questions!
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Old 12-12-2009, 01:27 PM   #2
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Every nitro 1/8 buggy I know of uses Mod 1.0 spur gears.

To find out gearing for top speed, use this calculator:


Just plug in your info. Diff gearing would be 43:13. Tranny ratio is 1. Just count the teeth on your spur.

With the calculator, you'll get an idea of what pinions you'll need to get the speed you want. Make sure your batteries can handle that amount of power drain. It takes a lot to go 60mph.
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Old 12-12-2009, 02:14 PM   #3
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I would get like 1 of them Robinson racing packs of 3 I think, you will need maybe 17-19-21 maybe. I would like to see that thing go. With 6S make sure you have the timing and punch control down all the way. I have the 2200 on 4S with the esc turned down all the way and still am geared for 42mph for racing. 19 tooth pinion. Also be careful with the gearing to big on the pinion you dont want to fry the esc and motor, get a temp guage and use it. Vent the body around the esc and motor and maybe get 1 of them Castle fan shrouds for the motor.
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Old 12-12-2009, 04:24 PM   #4
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Hiya, thanks for the replies.

I'm not a noob at this, so dont worry! I also just bash, no racing, hence the high speeds. The timing is set to normal, not low. Since this is a "monster truck" setup, running it in a buggy should be less stressful on both the motor and esc, both of which are more than capable. I'm gonna try and break 80mph. Theres a vid of an RC8 reaching 100mph, but that was with the 2650kv motor.

I just counted the spur, and its 46T. I'll try and work out the speed using the calculator, but i know it's been way off in the past
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Old 12-12-2009, 04:54 PM   #5
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Location: London, UK
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Pinion Speed
10T 39.73 mph
11T 43.70 mph
12T 47.68 mph
13T 51.65 mph
14T 55.62 mph
15T 59.60 mph
16T 63.57 mph
17T 67.54 mph
18T 71.52 mph
19T 75.49 mph
20T 79.46 mph
21T 83.43 mph
22T 87.41 mph
23T 91.38 mph
24T 95.35 mph
25T 99.33 mph

I think i'll buy a 17T pinion, seems like the best bet.
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