RC10Talk - The Net's Largest Vintage R/C Community

i installed the rpm trans case in my graphite rc10 project and i know the ratio is different but forgot the ratio was. im currently running a 17.5 in it and its dog slow with an 81 spur and a 26 pinion. just wanted to know a good baseline so i dont cook anything.

Is it the 2.65 white 10T case or the 1.96 gray case, which was more designed for on-road and oval?

I ran a 2.65 with an 18T BL, 81T or 78T spur (can't remember) and 25T pinion in my RC10 and it was stupid fast with a 2S LiPo. It soon exploded, but that's not the point.

http://www.rc10talk.com/viewtopic.php?f=40&t=26468&hilit=RPM+Stealth

According to people here, the natural-colored idler gears are stronger than the black ones. So get one of those if you haven't already.

its been dyed black...got it from bigjeepz so im not sure. never been good at figuring out the ratioos...i just go by the manuals...this is the only time ive been in this situation with these transmissions. ill have to scrounge around and find a natural colored idler...not sure if i have one.

GoldRush wrote:its been dyed black...got it from bigjeepz so im not sure.

Count the teeth on the top shaft. 17t = 2.65; 23t = 1.96.

its 2.65 that all he uses.PLus i saw it on it before was dyed lmao.DON

thanks for all the advice guys...it was a big help to figure out the ratio,i did open up the trans for piece of mind and it is a 17t top shaft so its gonna be the 2.65 ratio...im gonna play around with gearing and see if i can get some more top end out of it...its got plenty of torque to get out of corners i just need more speed...this thing couldnt get out of its own way if it tried with the current gearing. im using a novak havoc pro sc esc(at the moment) and a tekin 17.5 motor and a 5000mah 2s lipo so it has plenty of power. anyone have the part number for the natural colored idlers or have some to spare?

Rush, gear it like a B4 (2.60 tranny). So probably around 33/75 (according to the current B4.1 manual). Sounds about right, at HRH I ran 30/75 in my OG stealth gold pan (2.25), 33/76 in my TLR22 (2.42 I think).

unfourtunatly this rig still has a stock rc10 topshaft so i cant go lower than the 81 i have because i dont have anything smaller until i swap to the b4 topshaft or get smaller og style spur gears. i am geared 81/34 at the moment but i have yet to hit the track and its got just enough room to adjust the mesh but rubs the cover

I have a kimbrough 69 somewhere on my workbench, if you were closer....

I wont be at any local tracks until after Thanksgiving, too much @ work right now.

padded envelope?

Raced mine with 31/75 but was lacking a little top end speed. Put 33/75 last night. Might be back at the trak in a couple weeks to test.

Looks like the TC5 uses the same spur.

Link to a 75T on tower.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXPA05&P=7

I believe RPM has a ratio guide on there site...JohnnySr

Raced 36/75 tonight with the ballistic timing at 40 degrees. About 100f after an 8 minute main. Going to change the spur to a 69 tooth next.

ED