Ta04 Pro????

[mr lee]

Hi All

New here and I know this is probably an old and out dated chassis by now but I have a problem and wondered if anyone could assist....if anyone can still remember the TA04???

Before I gave cars up about a year ago I had just serviced my chassis and added a few hop ups which included aluminium hubs, heat sink motor mount and aluminium center pulleys.

Now this is the problem: I put the thing back together the same as it was before, with the exception of the hop ups, and the car was slower! I did however notice that the belt was fitting a little tighter than it did with the plastic pulleys but it just meant that I would not need the use of the belt tensioner. Has anyone noticed this?
I had and have tried changing pinions but it doesn't help. I have now ordered a new set of plastic pulleys from Tower and will try those but I cannot see that the aluminium ones should have a bigger diameter that would mess up the ratio's! I am totally clueless!

What is the internal ratio of the TA04 and how do you calculate the rolling diameter/ratio/whatever you call it? What rolling diameter should I work on?

I am using a "revenge of the monster" Trinity motor. I use foam Nitro shoes and ride it on asphalt.

Any help would be greatly appreciated

[Hachi_Roku]

There could be many possibilities that could of caused you TA-04 to run slower. Have you checked you gear mesh? Are you using the same batteries from a year ago? Has the motor been used in other cars so that the comm is more worn out now? Those could be one of the many problems

[mr lee]

Motor is the same one that was in the car before i serviced it! I have another super stock car (Schumacher) and I use the same batteries for both and it runs pretty quick. Gear mesh is ok. No broken teeth from stones. When I take the pinion off and spin the spur gear the drive train turns quite freely.

Do you have the formula to calculate the rolling diameter and do you know the internal ratio of the TA04?

[DTL]

The internal ratio of a TA04 is 2.13, if I am correct.
So multiplied with the ratio of your pinion and spurgear ,will give you the total ratio.

[DTL]

Mr Lee,
Did you use the correct pinion? Tamiya uses the metric gears 04 and 06 module. The TA04-PRO uses 04-module gears.
This can not be combined with a 64-pitch pinion.
Although they look almost identical.

[mr lee]

I changed to a 48 pitch spur and pinion, as they are popular here in South Africa, when I first got the car! The thing is that I had not changed anything except the hop up parts and it was running like a dream! I was even able to outrun my buddy with his TC3 or 4, I can't remember.

"The internal ratio of a TA04 is 2.13, if I am correct.
So multiplied with the ratio of your pinion and spurgear ,will give you the total ratio."

So from this calculation how would I get to the rolling diameter?

[Hachi_Roku]

I used to run a TA-04 as well. For stock motors, you would want to run something along the lines of a 27t pinion with a 96t spur (48 pitch).

[DTL]

Mr Lee
I am not sure what you mean with the term "Rolling Diameter"
If this is the distance your car will move if the motor makes 1 turn, than you can use the below calculation

D-- Diameter of wheel -- 65mm
P-- Number of T of the pinion -- 20
S-- Number of T of the spur gear -- 80
Ir-- Internal ratio -- 2.1333

Displacement = (D x 3.14 x ( S/P )) / Ir
= (65 x 3.14 x (80/20)) / 2.133
= 51.025 /2.133
= 23.92 mm

[TEM]

You should consider posting and reading the TA04 thread in the electric onroad section. Theres LOTS of good stuff there!

Are you looking for a rollout calculation?

rollout TA04 = pinion/spur * 15/32 *pi*tirediameter

I'ts really intuitive if you study the drive train. For a stock motor you should be looking for a rollout of around 26-30mm depending on motor, traction and layout.

[mr lee]

Thanks guys that's exactly what I was looking for. I am going to play around with different rollouts and ratio's this weekend. Will let ya'll know the outcome!

BTW, I am not sure WTH is going on with the TA04 only thread.....it seems like threads from 2001 are mixed with ones from 2003 and 2002 and and and..... That's why I posted this here :o

[TRF Drive Hard]

TEM, make sure mr lee isnt using torque rods, you may have to hold him in a cell for questioning... :p

[TEM]

TEM, make sure mr lee isnt using torque rods, you may have to hold him in a cell for questioning... :p

Patience TRF.... I'm working on it! :p