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Old 02-03-2007, 03:51 AM   #1
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Default Novak SS13.5 B/L gearing question, for T2

I'm new to Onroad and need some assistance. I was running my brand new T2R on our local carpet track today and fried my Novak brushless SS13.5 motor. I ran it through several packs yesterday, and it ran cool the whole time. Today, burned up on the second pack. Car is T2R, running on 26mm foams, LRP Sphere Competition Speedo, 24/84 gearing. The shop had a 13.5 so I replaced it, and dropped the pinion to a 22, and put an integy fan on the motor. The new motor is still running, but seemed to be running too hot still for only running for 7 minutes. I kept a close eye on it and it temped at 177 after 5 minutes, not bad, but it was hotter at times. Now, I know gearing depends on more things I can list, but I was hoping I could get some recommendations and/or info on what you guys are running for gearing with the Novak SS13.5 brushless motor in your T2. Thanks in advance for the help, this is my first venture in onroad after 18 years of Nitro offroad, and so far I'm loving it.
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Old 02-03-2007, 05:59 AM   #2
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don't have a T2 so not sure what that gearing final ratio is, in my YOkOMO i run a final of 5.4, the bigger the spur the better, i don't run a fan on the speedo, the motor temp is 125-130 degrees, also no fan on motor,
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Old 02-03-2007, 06:09 AM   #3
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Two of us at our track have burned up 4300's. We were both running shpere's. Try another speedo if it happens again? I'm running the GTB, and hav'nt had trouble sense.
Gear it to 120 to 140 but 130 is better.
I assume 26mm is the width of the tire mm in hieghth would help on gearing, and size of track. At our indoor medium size track 32mm roll out is about perfect. But every track is a little different.
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Old 02-03-2007, 07:27 AM   #4
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Put a slintered Rotor in the 13.5 . Don't know about burning up a motor I've still got my orginal.I did have a fan on the motor but since it cool out side I've removed it.when summers comes around again I'll put the fan back on.
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Old 02-03-2007, 07:33 AM   #5
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I have the sintered rotor to, dang thing is a miracle at keeping temps down.
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Old 02-03-2007, 10:12 AM   #6
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Is your car bound up somewhere? I am rolling out between 30-40 and have no problems with heat. Check your car and your setup sounds like you need to be free'ed up more.
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Old 02-03-2007, 04:17 PM   #7
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Depending on the diameter of your tires you are running between 29 and 32 mm roll out. You should be running closer to 38 mm. That would put you between a 28 and 30 tooth pinion. I run between 38 and 39 mm roll out but I'm going to test even higher.
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Old 02-03-2007, 04:22 PM   #8
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I second the sintered rotor recommendation. If you go that route, get the smallest spur you can find and the largest set of pinions, because you have to gear that thing to unbelievable levels before it's fast.
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Old 02-03-2007, 04:27 PM   #9
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Thanks for the info. Just for the heck of it, you guys mind listing what pinion and spur you run at your track, if you're running the 13.5? I'm bummed to hear the bad news about the Sphere. I waited 5 weeks to get the thing. I thought it would be a wise choice since t's the Sphere Competition and has a sticker on the box that says all new 2007 edition, blah blah, so I hope thats not it. But I'm considering 1/12 scale now too, and thats a good enough excuse to pick up a GTB to try.
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Old 02-03-2007, 04:44 PM   #10
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could you ellaborate on "unbelievable levels"

I just got mine, I threw around 32mm on it and it looks slow as fart on the car stand when applying full throttle never run it on the track but I would be surprised if it was fast with that gearing...
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Old 02-03-2007, 06:09 PM   #11
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On my BMI Cyclone I am running a 88t spur with 48t pinion and 57mm tires rolling out at about 40. If you havent already go to gearchart.com and print up a few roll out charts you need to be between 38 and 40 to be fast. Clean driving helps also, nice and smooth.
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Old 02-03-2007, 06:33 PM   #12
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On my local track the guys running Stocks (CO27) run at 19/84 so I put the SS13.5 at the same 19/84 (was running an FK05 which gears identical to a T2) and was every bit as quick, motor came off at 135 degrees which was fine considering it was around 110 that day.

Not sure on what track you run, but if I geared at 24/84 that'd be suicide! I'd be surprised if I didn't kill it with that gearing!
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Old 02-03-2007, 07:55 PM   #13
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Be careful the sintered rotor will hide over gearing by the ability to keep the temp down. If the threashhold of a motor is 30mm roll out, then thats it.
Its the same as putting a fan on in a sensce. It will still be over geared.
Has any one had a heads up race geared both ways? The bad thing with slower motors is the urge to over gear.
Heres the trick to over gearing a motor, its unbelievable batteries.
If your sintered rotor is fine you could be hurting the stater.
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Old 02-03-2007, 09:10 PM   #14
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So what is the threshold for the 13.5? I mean the car just seems to get better the more gear you throw at it.
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Old 02-03-2007, 09:21 PM   #15
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I'm running 104 tooth spur with a 38 tooth pinion and 58 mm tires. That just over 39 mm roll out. Usually come of the track in the 130 degree range with the sintered rotor.
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