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Old 11-23-2012, 01:13 PM   #1
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Default Xray T3 Spur/Pinion for 17.5 blinky

New to RC and wondering what would be a good Spur/Pinion setup for 17.5 blinky for a 50'x50' indoor carpet track. I currently have the 84T 48pitch spur gear. Wondering if 64pitch is a better way to go or the pro's/con's of each. Thanks for your input!
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Old 11-23-2012, 01:26 PM   #2
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64p 96 tooth.
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Old 11-23-2012, 01:36 PM   #3
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I ran 96 spur and usually had a 44-49on it getting me a 4.2-3.8 fdr
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Old 11-23-2012, 01:39 PM   #4
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Quote:
Originally Posted by TCicon View Post
New to RC and wondering what would be a good Spur/Pinion setup for 17.5 blinky for a 50'x50' indoor carpet track. I currently have the 84T 48pitch spur gear. Wondering if 64pitch is a better way to go or the pro's/con's of each. Thanks for your input!
48pitch is less likely to strip. It's good for Mod and boosted classes, but much more difficult to get down to the sort of FDRs required for blinky spec racing.

64pitch is a little smoother and allows for finer adjustments to gear ratios. It can strip a bit easier in a more flexible car or with faster motors.

I use a 102tooth 64p "Core RC" spur with usually around a 50 tooth CRC pinion for 17.5 blinky on tracks of similar size to yours. d3.5 motor in an xray t4, but I ran the same gear in a t3'12 prior to this. I have also used 100/52 on a larger track.

Between 3.3 and 4.5 FDR is the approximate range for 17.5 blinky. 4.0 should be a good place to start.
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Old 11-23-2012, 04:28 PM   #5
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If you want to run 17.5 blinky, you'll need to gear taller anyway, an 84t spur won't do it.
I've always run 48dp as I don't like trying to mesh 64dp.

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Old 11-23-2012, 04:41 PM   #6
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I also prefer 48p, Skiddins. I always use 48p in Mod and boosted, but I just have never found a small enough spur and a large enough pinion to run 48p in 17.5 blinky. Plenty of 64p choices to get down to low FDRs though.
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Old 11-23-2012, 05:07 PM   #7
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Originally Posted by jlfx car audio View Post
I ran 96 spur and usually had a 44-49on it getting me a 4.2-3.8 fdr
This
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Old 11-23-2012, 05:23 PM   #8
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I run a 92 with a 48 or 49 for a 3.8-3.6 fdr. This is with a Rectech a 12.5mm hi torque rotor.
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Old 12-05-2012, 09:05 PM   #9
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48P vs 64P:
64P is way better in a way that you can up or down the FDR a lot easier. Reason? The finer teeth on 64P spur allow relatively small changes in size of the spur among different T's. I have tones of 48P spurs and pinions. Once I tried to make FDR 3.8 with 48P 78T spur for my x-ray. X-ray's DTR is 1.9 so the pinion comes down to 39. When I put that in, it would not fit there unless the spur and pinion clench each other so tight. The same exact opposite is true when you try anything above 7.0 with 48P. They don't meet each other. Of course I could've tried smaller spur and pinion for 3.8 but it's simply hard to get hold of smaller spur in each size. Better get 64P in the first place. Some people even say 64P is smoother but from my experience it doesn't make big difference. 48P is louder.
But I still use 48P for FDR between 5 and 6. It'd be a waste not to use 10 48P pinions I have.
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Old 12-30-2012, 02:30 AM   #10
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Sorry guys I am new to all this so Im not familiar with all the lingo lol

Anyways I got a T4 just currently in the middle of the build ,..... I have not bought a Pinion gear for it yet .....However what is a good general gearing for 17.5 class ?

Do I use the stock spur with the kit?

Basically would like to know plain and simple what I should start with for my T4 running a 17.5 blinky class ?

Thanks in advance .
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Old 12-30-2012, 06:45 AM   #11
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Default gearing

Quote:
Originally Posted by yunowill View Post
Sorry guys I am new to all this so Im not familiar with all the lingo lol

Anyways I got a T4 just currently in the middle of the build ,..... I have not bought a Pinion gear for it yet .....However what is a good general gearing for 17.5 class ?

Do I use the stock spur with the kit?

Basically would like to know plain and simple what I should start with for my T4 running a 17.5 blinky class ?

Thanks in advance .
you will want to start around a Final Drive Ratio of 4.0, which is close to a:
92 tooth spur, 44 tooth pinion, 64 pitch, which is 3.97 ratio
or
96 tooth spur, 46 tooth pinion, again 3.97

i personally run a 92 spur, and depending on what track i am at, 47-50 pinion
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Old 12-31-2012, 01:42 AM   #12
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Sweet I am going to try that out .... I will most likely go with the 96T spur as thats what most are using in this thread ..... If a final drive of 4.0 is a good starting range I will go with what you have said and see what I can do from there ..... I guess my 84T spur that came with the kit is no good for this application ?



Quote:
Originally Posted by Bigz84 View Post
you will want to start around a Final Drive Ratio of 4.0, which is close to a:
92 tooth spur, 44 tooth pinion, 64 pitch, which is 3.97 ratio
or
96 tooth spur, 46 tooth pinion, again 3.97

i personally run a 92 spur, and depending on what track i am at, 47-50 pinion
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