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Tamiya Direct Drive Touring Car

Old 07-03-2007, 11:31 AM
  #1216  
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Originally Posted by Alfie View Post
Both pitches aren't the same. You may run it with no problem now, but after a short while, either the spur or the pinion will start to give way. Listen for the noise caused by the meshing of the gears.

0.4 is in METRIC and 64 is in INCHES.

Even the 48 pitch gears are now available in both Metric & Inches too.

Alfie
Originally Posted by Alfie View Post
I've gotten my new 8.5R PRO Motor and run it at 15T/82T. No thermal at all.

The stock gearing ratio is at 5.00 (70T/14T). Are you serious that you are running your gear ratio at 2.97?? Do you get any thermal with that low gear ratio?

Alfie

Oops! my mistake, got the pitch rating mixed with the teeth.
yes I run 31 (64p) and the smaller 0.4p Tamiya Spur (93), with Cheetah Foams 40f 38r and the Tamiya Courage shell.
This gear ratio and pinion spur has now run for almost 4 hours, and as of yet there is no tooth wear from the mixed pitch ratings (only small stone debris damage).
Motor will thermal out on 32 before 6 minutes, where as with the 31 I can run 10 minutes with no thermal, and the lap times are faster than with a 30.
But then again this is England where the air and ground temperatures are much colder than many parts of America, so maybe this is why I can use this gear ratio.

Last edited by NiMo; 07-03-2007 at 11:43 AM.
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Old 07-03-2007, 11:52 AM
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Old 07-03-2007, 11:53 AM
  #1218  
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I finshed building my F103gt and I have been making test runs. It seems that because of the diff design, the diff side wheel spins and makes the car pull to one side. I have reduced the problem some what by running the diff extremely tight. Are there any other solutions or suggestions. I am running on the street with a 540 silver can motor. My gear ratio is 93/25. Thanks.
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Old 07-03-2007, 12:13 PM
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Originally Posted by MD View Post
I finshed building my F103gt and I have been making test runs. It seems that because of the diff design, the diff side wheel spins and makes the car pull to one side. I have reduced the problem some what by running the diff extremely tight. Are there any other solutions or suggestions. I am running on the street with a 540 silver can motor. My gear ratio is 93/25. Thanks.
try removing the excess grease from the bearings on the drive shaft, this will balance out the drag on bothe sides.
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Old 07-03-2007, 08:05 PM
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I'm sure to be interested in running at that sort of gear ratio.

In my country, it's hot and humid. 5.71 is what would run normally. Given a chance, I'd run around 4.9 ratio.

Are you running with a fan blowing at the ESC's Heatsink?
Alfie


Originally Posted by NiMo View Post
Oops! my mistake, got the pitch rating mixed with the teeth.
yes I run 31 (64p) and the smaller 0.4p Tamiya Spur (93), with Cheetah Foams 40f 38r and the Tamiya Courage shell.
This gear ratio and pinion spur has now run for almost 4 hours, and as of yet there is no tooth wear from the mixed pitch ratings (only small stone debris damage).
Motor will thermal out on 32 before 6 minutes, where as with the 31 I can run 10 minutes with no thermal, and the lap times are faster than with a 30.
But then again this is England where the air and ground temperatures are much colder than many parts of America, so maybe this is why I can use this gear ratio.
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Old 07-03-2007, 08:19 PM
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Tighten the locknut on the Diff Housing to the point that the diff plates (on both sides) only touches the diff balls, NOT pressing hard on the diff balls. When you tightened the locknut, hold both ends (Left & right) and the spur with your fingers. Then try to rotate the spur without diff assembly moving along.

Do this from loose diff first, this way, you will understand what I'm trying to tell you.

Also do check on the little grub screws that are holding to the rear shaft. They may be loose, making your car swirl to one side upon moving off.

Hope this helps.
Alvin


Originally Posted by MD View Post
I finshed building my F103gt and I have been making test runs. It seems that because of the diff design, the diff side wheel spins and makes the car pull to one side. I have reduced the problem some what by running the diff extremely tight. Are there any other solutions or suggestions. I am running on the street with a 540 silver can motor. My gear ratio is 93/25. Thanks.
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Old 07-04-2007, 09:26 AM
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Originally Posted by NiMo View Post
Oops! my mistake, got the pitch rating mixed with the teeth.
yes I run 31 (64p) and the smaller 0.4p Tamiya Spur (93), with Cheetah Foams 40f 38r and the Tamiya Courage shell.
This gear ratio and pinion spur has now run for almost 4 hours, and as of yet there is no tooth wear from the mixed pitch ratings (only small stone debris damage).
Motor will thermal out on 32 before 6 minutes, where as with the 31 I can run 10 minutes with no thermal, and the lap times are faster than with a 30.
But then again this is England where the air and ground temperatures are much colder than many parts of America, so maybe this is why I can use this gear ratio.
thanks NiMo
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Old 07-04-2007, 09:26 AM
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Originally Posted by Alfie View Post
I'm on 80T Spur with 14T Pinion. This is on 48 pitch gears.

Pretty nice and fast. Can max out my throttle, but only for a short while, due to the lack of really long straights.

Hope it helps!
Alfie
thanks Alfie
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Old 07-06-2007, 07:27 PM
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The real LeMans Diffuser; ABC Type C Diffuser.

Alfie
Attached Thumbnails Tamiya Direct Drive Touring Car-diffuser_c.jpg  
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Old 07-06-2007, 08:36 PM
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Originally Posted by Alfie View Post
The real LeMans Diffuser; ABC Type C Diffuser.

Alfie
nice
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Old 07-06-2007, 09:23 PM
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Nimo and Alfie, thanks for the help.
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Old 07-07-2007, 05:12 AM
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No worries.

Hope the setup explaination helps!
Alfie


Originally Posted by MD View Post
Nimo and Alfie, thanks for the help.
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Old 07-07-2007, 05:16 AM
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Yeah... That's why I couldn't get my hands on one and started tearing up a pack to try it for myself.

Alfie



Originally Posted by Marcos.J View Post
nice
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Old 07-07-2007, 05:34 AM
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Originally Posted by Alfie View Post
I'm sure to be interested in running at that sort of gear ratio.

In my country, it's hot and humid. 5.71 is what would run normally. Given a chance, I'd run around 4.9 ratio.

Are you running with a fan blowing at the ESC's Heatsink?
Alfie
using Novak's GTB fan as supplied

Just been told by my club that due to lack of entries in some classes they will no longer allow low entry classes to run on race day
So unless another 5 cars appear I will no longer be running this car.
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Old 07-07-2007, 08:31 AM
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Originally Posted by NiMo View Post
using Novak's GTB fan as supplied

Just been told by my club that due to lack of entries in some classes they will no longer allow low entry classes to run on race day
So unless another 5 cars appear I will no longer be running this car.
that sucks
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