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Old 08-12-2007, 08:27 AM   #1
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Default Gearing for Novak 13.5 to 13.0 rotor in Stock

My local tracks will be allowing the new Novak 13 rotor in Stock. I just received one from Novak on Friday and will be dropping it in today.

Has anyone done any testing about the change to the gearing resulting from the change? Is is gear up (logical with more initial torque) or gear down?

Thanks.
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Old 08-12-2007, 11:57 AM   #2
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You are one of the first people to post.... I personally would try it out with the gearing you have first and see temps and if you like it
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Old 08-12-2007, 12:15 PM   #3
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One of the guys from Novak was on here and said you'll definitely need to gear up. The motor has even more torque bias than it did before. I hope mine show up at the LHS this week!
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Old 08-12-2007, 12:19 PM   #4
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There *should* be a pretty thorough gearing guide included with the new 13.0 mm rotor ... if not please let me know so I can get to the bottom of it!
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Old 08-12-2007, 12:35 PM   #5
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Originally Posted by syndr0me View Post
One of the guys from Novak was on here and said you'll definitely need to gear up. The motor has even more torque bias than it did before. I hope mine show up at the LHS this week!
As usual, I can count on you. Thanks syndr0me.
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Old 08-12-2007, 01:52 PM   #6
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Originally Posted by Still Bill View Post
As usual, I can count on you. Thanks syndr0me.
*takes a bow*

I hear the new rotor opens up the gearing window, which will be a welcome change. I struggle gearing the 13.5 right on carpet, because it runs about the same with just about any rollout, and then in one tiny little range it's a bit faster. That's a particularly annoying target to try and hit with foam tires always changing sizes.
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Old 08-12-2007, 05:32 PM   #7
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As Steve pointed out...I have now looked at the chart included with the 13.0 rotor. It suggests a final drive of 4.0 for rubber tired TC cars with the new rotor in a 13.5 motor.
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Old 08-12-2007, 05:41 PM   #8
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Quote:
Originally Posted by syndr0me View Post
*takes a bow*

I hear the new rotor opens up the gearing window, which will be a welcome change. I struggle gearing the 13.5 right on carpet, because it runs about the same with just about any rollout, and then in one tiny little range it's a bit faster. That's a particularly annoying target to try and hit with foam tires always changing sizes.
You won't have to worry about that changing tire size once you move to Denver!
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Old 08-12-2007, 06:26 PM   #9
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Mine should arrive this week sometime
Does the included chart mention gearing for a 10.5?
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Old 08-12-2007, 06:36 PM   #10
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Originally Posted by Still Bill View Post
My local tracks will be allowing the new Novak 13 rotor in Stock. I just received one from Novak on Friday and will be dropping it in today.

Has anyone done any testing about the change to the gearing resulting from the change? Is is gear up (logical with more initial torque) or gear down?

Thanks.
It won't work with your LRP speedo. You'r going to have to buy a NOVAK speedo! LOL!
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Old 08-12-2007, 06:47 PM   #11
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Hey Ottoman,

FDR with a converted 10.5 motor is supposed to be 5.0 for rubber sedan. There is also a calculation included for determining gearing for foam setups.

Must say that I am a bit surprised that the new gearing would be so high for Stock and 19T. I will "progress" with my Stocker in this direction; and, not go "rad" (all the way to 4.0 FDR) in one jump.

Actually, instead of a single FDR number, I would rather see Novak indicate a gearing range for each motor configuration.

For quick identification, "a small groove has been added on the pinion shaft side of the motor near where the shaft size reduces down the the large front bearing". Per my initial inspection, the shaft appears to have an additional shoulder (transition) that makes the described "groove".

Have I spilled all the beans yet? Just don't tell anyone in Nor Cal...

Bill
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Old 08-12-2007, 06:48 PM   #12
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Quote:
Originally Posted by Advil View Post
It won't work with your LRP speedo. You'r going to have to buy a NOVAK speedo! LOL!
It WILL work mo better with the LRP...
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Old 08-12-2007, 06:54 PM   #13
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Originally Posted by Yeti35 View Post
You won't have to worry about that changing tire size once you move to Denver!
I know. :-( At least there's some outdoor electric going on out there, and a little off-road in the winter. It's sad, though, I'm gonna miss the rug.
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Old 08-12-2007, 09:12 PM   #14
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Default Gearing and Temps

OK, here are some more tidbits from the Instruction Sheet.

"The gearing recommended should be used only as starting points with the new 13.0mm Tuning Rotor, but the motor and ESC temperatures should always be used to determine the final gearing."...Sounds like buyer beware to me!

"Neither the motor nor the ESC should be hotter than 160 -170 degrees Fahrenheit after a five minute run."...Sounds like 170 F to me.

"If either temperature is higher than 175 degrees F, the gearing should be lowered until both the motor and ESC are under this temperature."...Sounds like exceeding 175 F is the 'ouch number' to me.

"The cooler the ESC and motor run, the better the performance of the system will be."...Sounds like 32 F (freezing) could be good to me. Maybe Steve will chime in about this statement.

I love the guys that write this stuff.

Bill
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Old 08-12-2007, 09:30 PM   #15
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