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Old 09-28-2007, 06:44 PM   #1
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Default brushless gearing??

i have an assiciated b4 buggy and i just ordered a novak 7.5 today , just wondering what some of you guys are running for gearing ,so i can pick up the right gears when i pick up the motor.
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Old 09-28-2007, 08:14 PM   #2
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81-21 for most tracks. Im currently running 84-21 on a smaller indoor track.
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Old 09-29-2007, 12:29 AM   #3
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I am running an 81 spur with a 21 pinion on my 7.5 brushless.
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Old 09-29-2007, 01:40 AM   #4
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anyone feel the 7.5 is lacking in the torque department but killer on top end?
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Old 09-29-2007, 12:56 PM   #5
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Well, I just took a peek at the specs out of curiosity. It's a high rpm capable motor, but it's only 275 watts on average according to the dyno. That puts it around a little over 1/3 HP. It's also designed for 'low traction' situations. Being sensored as well it's all supposed to feel very smooth on accelleration. If you find yourself needing more ass-end breaking power try gearing up differently. If the top end loss is too much, add more voltage. If you race a class that prohibits that, change classes or motors

But thats just what I got from reading up on it, someone with experience might provide better help.

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Old 09-30-2007, 12:35 AM   #6
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no the car makes plenty of power with 7.5. U can play with gearing to see were u like it.
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Old 09-30-2007, 09:22 AM   #7
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Cool. Thanx guys. I'll change the gearing and see what happens today.
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Old 09-30-2007, 01:20 PM   #8
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I tried mine 81/21 and it didn't have hardly any drag brake. I had to drop a couple teeth to get brakes. It runs good at 81/18-19

I have the original Reedy 7.5 (2 star)
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Old 09-30-2007, 01:24 PM   #9
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Quote:
Originally Posted by air8 View Post
anyone feel the 7.5 is lacking in the torque department but killer on top end?


I know of a bunch of guys running 7.5's at our track and they deffinently arent lacking low end grunt. Most of us are running orion's or LRP(sintered) tho.
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Old 10-07-2007, 08:15 PM   #10
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Has anyone tried the 13mm rotor in a 7.5/6.5/5.5 and noticed a difference? I'll try it out next race. Just wondering what other noticed.
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Old 10-07-2007, 08:24 PM   #11
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Quote:
Originally Posted by air8 View Post
anyone feel the 7.5 is lacking in the torque department but killer on top end?
i think the 7.5 has a bit too much torque... the slipper slips for like 20 feet with it! lol. it has too much torque for me.
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Old 10-07-2007, 08:29 PM   #12
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Yeah, don't think I need any more power really. I tried the 13mm in my 13.5ss but took it out cause it took away top end with no noticeable increase in torque. I did go up two teeth in pinion but still get the same lap times. In the on-road forum they talked like the 13mm rotor was more for the faster motors. So that fit with my results in the stock can.
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