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Old 06-30-2008, 11:44 AM   #1
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Default T4 gearing options for new motor

I am getting a new motor and would like some input about the starting point for gearing. I am curently running nimh's with a Novak 4300Kv geared at 87/21. I am going to start a stock class series and want to get some ball park options for my new motor (Novak SS 17.5) which should be here tomorrow. I am looking for more acceleration vs. top speed as the track I run at it not that large.

Thanks and let me know if you have any other questions.
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Old 06-30-2008, 05:46 PM   #2
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Per Novak's web site the FDR for a 2WD Truck and the 17.5 motor should be around a 7.5 FDR. Given an 87T spur, and a transmission ratio of 2.6 (I think that's the T4 ratio), my guess would be a 30T pinion to start with. 87T spur / 30T pinion * 2.6 = 7.54 FDR. You need to talk to someone who is running this motor off road to get real world info. Also, pay close attention to the temps after running to ensure you are below 160 (ESC and motor).

Check out this link:
http://www.teamnovak.com/tech_info/b...r_gearing.html

Good luck .....
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Old 06-30-2008, 06:04 PM   #3
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I am running a 78/28 in my T4, just for an idea...
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Old 06-30-2008, 08:13 PM   #4
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I'm running an 84/28 on mine with a 17.5...
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Old 06-30-2008, 09:37 PM   #5
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We have a new track where I live, the track in a little tight. But with 78/28, I still get wheel spin, So I have to be a little easy on the trigger.
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Old 07-01-2008, 01:48 PM   #6
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Thanks for the replies. ANyone want to comment on why you would change the spur gear size? I assume there is a reason for which I am not aware of yet, but attempting to soak all of this FDR=#*&%/@! I know have a starting point. This is a whole lot different than just making sure I had gas in my T-Maxx.

Halve you running at OCRC?
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Old 07-01-2008, 02:00 PM   #7
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Changing the spur in off-road is mainly to adjust where the motor sits in the truck. A smaller spur moves the motor forward, putting more of the weight on the rear wheels. While a larger spur puts the motor further back promoting the rear end to rotate more.

In a truck, I'd stick with 87 or 84. 78 for the T4 is tiny!
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