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Old 09-14-2010, 07:36 PM   #781
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That holds true if you are running dynamic timing... With the 17.5 class at the hanger being a "no timing" class, you will have to gear taller since the motor won't produce the super high rpm.

3.8-4.0 is a safe area to be in for gearing for the Hanger with no timing 17.5. Since they don't make the newer xenon based spur gears in 100T, I would just drill/ream two holes in the spur gear (opposite from each other to maintain balance) so there is access to the motor screw.

Hope that helps!

-Korey
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Old 09-14-2010, 07:38 PM   #782
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in these parts Korey is Mr.HB do what he said. 4.0 is a good starting point
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Old 09-14-2010, 07:42 PM   #783
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HAHA - ok, got it. ;-)

I will be running 4.0...
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Old 09-14-2010, 07:45 PM   #784
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Hmm - just downloaded the manual and noticed that HB recommends an FDR of 6.0 - 7.3 with a 17.5. What do you think?

The FDR of 6.0 - 7.3 with a 17.5 for Ramping ESC.

Also, I would buy the Alum. Servo Mount, it drilled with offset holes for all brands servo.

http://www.hotbodiesonline.com/products/en/61335.html
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Old 09-14-2010, 08:16 PM   #785
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Quote:
Originally Posted by Korey Harbke View Post
That holds true if you are running dynamic timing... With the 17.5 class at the hanger being a "no timing" class, you will have to gear taller since the motor won't produce the super high rpm.

3.8-4.0 is a safe area to be in for gearing for the Hanger with no timing 17.5. Since they don't make the newer xenon based spur gears in 100T, I would just drill/ream two holes in the spur gear (opposite from each other to maintain balance) so there is access to the motor screw.

Hope that helps!

-Korey


I'm real interested to see if you can get access to the rear motor screw even with a drilled hole in the spur. By eyeballing it it looks like you can't get the hole out far enough to the edge of the gear (without getting into the teeth) to do any good. I don't think the motor bulkhead was designed with these crazy ratios in mind. Now if somebody has run a 3.8 ratio in a TCX that would be cool. Please let me know.
Thanks.
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Old 09-14-2010, 08:36 PM   #786
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WILL THE DCJ DRIVE SHAFTS work on the tcx?
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Old 09-14-2010, 09:17 PM   #787
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WILL THE DCJ DRIVE SHAFTS work on the tcx?
no...most are upgrading to the pro 4 46mm there more beefy

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Old 09-14-2010, 09:21 PM   #788
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I'm real interested to see if you can get access to the rear motor screw even with a drilled hole in the spur. By eyeballing it it looks like you can't get the hole out far enough to the edge of the gear (without getting into the teeth) to do any good. I don't think the motor bulkhead was designed with these crazy ratios in mind. Now if somebody has run a 3.8 ratio in a TCX that would be cool. Please let me know.
Thanks.
Looks like it can be done with a 100T spur. It isn't happy with 88T so far... but 100T it's fine. There is a lot of pinion room too, so I wouldn't be surprised if you could just put a honker pinion on there either. I'll play with it more soon... lacking the flywheel pinions gears to try stuff right now

-Korey
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Old 09-14-2010, 10:08 PM   #789
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Hmm - just downloaded the manual and noticed that HB recommends an FDR of 6.0 - 7.3 with a 17.5. What do you think?

How do you account for tire size? I.e. - I assume these gear ratios take what size diameter tire?
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Old 09-14-2010, 10:25 PM   #790
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Tire size is more of a foam tire thing...

Most rubber tires are 63mm or so. They can vary a little bit, but it's pretty insignificant in most cases, so we just use a final drive ratio (what is shown on the chart) as a way to compare and calculate gear ratios.

Because of tire wear and overall size changes, foam tire racers generally calculate rollout. This takes tire size into consideration. Its a common practice in 1/12 racing, as well as foam tire carpet racing for touring cars.

Formula for rollout:

(Tire diameter * 3.14) / [(Spur/Pinion) * 1.95]

The 1.95 is the internal ratio of the TCX, but will vary car to car.

-Korey
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Old 09-15-2010, 07:36 AM   #791
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Quote:
Originally Posted by Korey Harbke View Post
Looks like it can be done with a 100T spur. It isn't happy with 88T so far... but 100T it's fine. There is a lot of pinion room too, so I wouldn't be surprised if you could just put a honker pinion on there either. I'll play with it more soon... lacking the flywheel pinions gears to try stuff right now

-Korey
I think the problem with a 'honker' pinion will be that it pushes the motor more forward and makes getting at the back screw worse.
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Old 09-15-2010, 07:48 AM   #792
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At my track we currently run 17.5 with no timing or boost. Our final drive ratio is 4.77. So i'm assuming I will have problems getting the gearing I need? What is the smallest spur that will fit on the TCX? Also, what brands other that Xenon will fit? My local track is pretty small, but I do travel to bigger tracks, so need to make sure I have some room to use different size pinions. My TCX should be here Friday. But if it is going to be a big hassle to make it work I'm going to return it. Any help will be appreciated. Thanks

Where can I find the poundage ratings of the springs? and I have looked for places to buy the pink springs but can't find them. Thanks again
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Old 09-15-2010, 11:53 AM   #793
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Hara was Won IIC

http://www.redrc.net/2010/09/atsushi...as/#more-35252
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Old 09-15-2010, 01:15 PM   #794
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Hi everyone !
A question, why are top drivers using the body post here?
Thanks!
Sorry with my bad english.

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Old 09-15-2010, 01:32 PM   #795
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it was posted on the last page, it is to help support the body from getting tucked under when you get crashed into......

hth
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