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Old 09-19-2013, 04:16 PM   #136
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Receive my kit today !
I just take some measurements...
Post corrected with new measurements
Max distance center of spur shaft to center of motor shaft = 28.5mm
Min distance center of spur shaft to center of motor shaft = 24.5mm
Max pinion size with plastic spacer = 18.3mm or a 43T 64P pinion
Max pinion size with just the brass sleeve = 20.9mm or a 49T 64P pinion

The lowest FDR I was able to achieve with my spare parts is 3.88 with an 76T spur and a 49 pinion !
I don't think it's possible to have a lower FDR without a different motor mount...
Your millage may vary with different spur/pinion manufacturer.

I will try to dremel the motor spacer to have just the sleeve as the limiting factor...a picture may follow this weekend if somebody is not faster than me

In my opinion this kit is definitively usable with a 17.5 and not optimal for higher turn without a new motor mount redesign !

Alexandre

Last edited by daktulos; 09-19-2013 at 05:41 PM.
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Old 09-19-2013, 04:32 PM   #137
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Quote:
Originally Posted by daktulos View Post
Receive my kit today !
I just take some measurements...

Max distance center of spur shaft to center of motor shaft = 28.5mm
Min distance center of spur shaft to center of motor shaft = 24.5mm
Max pinion size with plastic spacer = 18.3mm or a 43T 64P pinion
Max pinion size with just the brass sleeve = 22mm or a 50T 64P pinion

The lowest FDR I was able to achieve with my spare parts is 3.8 with an 76T spur and a 50 pinion !
I don't think it's possible to have a lower FDR without a different motor mount...
Your millage may vary with different spur/pinion manufacturer.

I will try to dremel the motor spacer to have just the sleeve as the limiting factor...a picture may follow this weekend if somebody is not faster than me

In my opinion this kit is definitively usable with a 17.5 and not optimal for higher turn without a new motor mount redesign !

Alexandre
so you got 3.8 just with pinion and spur everything mounted? .....man looks like i found my next USGT car !!!! wo hooo
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Old 09-19-2013, 04:48 PM   #138
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3.8? well that knocks this car out of use for Tamiya TCS' GT2 class if thats the case.
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Old 09-19-2013, 05:05 PM   #139
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Originally Posted by rkhess View Post
so you got 3.8 just with pinion and spur everything mounted? .....man looks like i found my next USGT car !!!! wo hooo
Not without a spacer mod
I forgot to mention without dermeling anything 80/43 is possible for a 4.65 FDR
I am more exited to have new parts to test for my EVO V conversions
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Old 09-19-2013, 05:08 PM   #140
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hmmmm that means I could run this in 13.5.....interesting
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Old 09-19-2013, 05:16 PM   #141
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Quote:
Originally Posted by Big Midget View Post
Sounds like you can lay the front shocks down. Right?
Like the IFS chassis.
Looks like the Pro comes with regular stand up shocks, but the basic kit comes IFS style (not sure if you can also stand up)
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Old 09-19-2013, 05:20 PM   #142
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I'll be running 13.5-boosted, so my FDR window is 4.7-7FDR. Not affected by the gearing limits. Can someone measure the biggest 48p pinion I can use without any mod?
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Old 09-19-2013, 05:33 PM   #143
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OK to excited here the quick way of doing it !
When I measure for the sleeve to sleeve it was with just the screws not with the spacer in place...
So the real measurement is 20.90mm and the max pinion size without tempering with the sleeve is 49T...for a 3.88 FDR
I will correct my first post.
Attached Thumbnails
Tamiya TB04 Pro-2013-09-19-19.23.58.jpg   Tamiya TB04 Pro-2013-09-19-19.25.59.jpg   Tamiya TB04 Pro-2013-09-19-19.26.48.jpg  
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Old 09-19-2013, 06:52 PM   #144
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While the gearing issue is a setback, It's not going to stop me from getting this kit. I am going to be running either a 13.5t, 17.5t or 21.5t, and 48 pitch gears are a must. I'm sure I will figure something out...
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Old 09-19-2013, 07:06 PM   #145
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You should be able to use a smaller spur which will cure the gear ratio problems. 68 spur should get you guys where you need to be

I'm sure if you use 68 spur divide by 52th pinion X 2.5= 3.26

Last edited by Juan Aveytia; 09-19-2013 at 07:29 PM.
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Old 09-19-2013, 07:49 PM   #146
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Quote:
Originally Posted by Juan Aveytia View Post
You should be able to use a smaller spur which will cure the gear ratio problems. 68 spur should get you guys where you need to be

I'm sure if you use 68 spur divide by 52th pinion X 2.5= 3.26
Except you can't fit a 52 pinion in there.
Except the car is out of adjustment with a 76 spur.
Just saying.

I expect some update parts, but till then....I'm running my M03.
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Old 09-19-2013, 07:53 PM   #147
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Quote:
Originally Posted by Juan Aveytia View Post
You should be able to use a smaller spur which will cure the gear ratio problems. 68 spur should get you guys where you need to be

I'm sure if you use 68 spur divide by 52th pinion X 2.5= 3.26
Yes your wright but you need to go around 76t spur in 64 pitch for the lowest FDR possible without redesigning the motor mount or seriously compromising the solidity of the motor union because you are already at the farthest you can go with the motor when using a 49t/50t pinion...
If you take out the sleeve at the spacer you may be able to put a bigger pinion and at the same time use a smaller spur.

Seriously the solution for the motor mount "limitation" will probably be solved with a chassis conversion
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Old 09-19-2013, 08:06 PM   #148
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Hmm...thanks for the pictures. Looks like the sleeve is the limiting factor. =/

I wonder if Tamiya USA ever has any input for Tamiya Japan on new car designs seeing as how 17.5 class is the most popular everywhere. Seems they keep shooting themselves in the foot on potential more sales.
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Old 09-19-2013, 08:21 PM   #149
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Quote:
Originally Posted by daktulos View Post
Receive my kit today !
I just take some measurements...
Post corrected with new measurements
Max distance center of spur shaft to center of motor shaft = 28.5mm
Min distance center of spur shaft to center of motor shaft = 24.5mm
Max pinion size with plastic spacer = 18.3mm or a 43T 64P pinion
Max pinion size with just the brass sleeve = 20.9mm or a 49T 64P pinion

The lowest FDR I was able to achieve with my spare parts is 3.88 with an 76T spur and a 49 pinion !
I don't think it's possible to have a lower FDR without a different motor mount...
Your millage may vary with different spur/pinion manufacturer.

I will try to dremel the motor spacer to have just the sleeve as the limiting factor...a picture may follow this weekend if somebody is not faster than me

In my opinion this kit is definitively usable with a 17.5 and not optimal for higher turn without a new motor mount redesign !

Alexandre
Nice work and thanks for the pics! I'm feeling better about this kit now.

Last edited by speedy_w_beans; 09-19-2013 at 08:32 PM.
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Old 09-19-2013, 08:25 PM   #150
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Thanks for the pics, daktulos. Is that 48p you're using? And you're using a 76t Spur to get 3.88 ratio. Is that right.

I think I was down to 3.65 with 17.5 and we're moving to 13.5 blinky soon, so that might still be do-able for me, although as everyone is saying it might still rule out the market of 17.5/21.5/USGT/VTA, etc
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