2Likes3Racing Sakura Zero S
12-09-2010, 12:05 PM
#107
It's a crazy issue for any car today. To run higher turn motors, you use small spur gears. With spec cars using 21.5 or 25.5 motors, you use TINY spurs with no holes or potential space for drilling. You shouldn't have to, IMO. The stock motor mount blows chunks. Should have never been designed that way in the first place.
http://os.3racing.hk/products.php?products_key=5048
Makes the motor mount screws vertical instead of horizontal. A stock motor necessity unless you like unbalancing your spur gear by drilling wonky holes in them.
http://os.3racing.hk/products.php?products_key=5048
Makes the motor mount screws vertical instead of horizontal. A stock motor necessity unless you like unbalancing your spur gear by drilling wonky holes in them.
12-09-2010, 01:38 PM
#109
from my experience, i run 3.5 to 4.0 for 17.5 . check the motor temp after each run... i try to keep it between 160-170F ...
as for the pinion, what's the cloest one to 38t you have in your pit box? 38t might be too big. Build the car first and see how much room u have. I think you might need a smaller spur.
12-09-2010, 03:05 PM
#112
Just so you guys don't have to do the math, with the various diff and layshaft pulleys available, you can get a bunch of different internal ratios with this car. I would guess some of the larger layshaft pulleys won't work because of the belt lengths, but that's a guess.
I have not tried them all, so I don't know if these belts will handle all of them, but here are the internal ratios for all of the pulleys:
I made a simple FDR calculator sheet in Excel similar to the one we used for VTA racing for all of the Sakura internal ratios and pulley options. input your spur and pinion combo and it will calculate the FDR for you. No frills, but it will find an optimal FDR if you are looking for a specific ratio.
doug
*GEAR marks ratios only available with the new 39T or 40T gear diff pulleys. Not available for ball or roller diffs.
I have not tried them all, so I don't know if these belts will handle all of them, but here are the internal ratios for all of the pulleys:
- 40T/19T: 2.105:1 GEAR
- 39T/19T: 2.052:1 GEAR
- 38T/19T: 2.000:1
- 40T/20T: 2.000:1 GEAR
- 39T/20T: 1.950:1 GEAR
- 37T/19T: 1.947:1
- 40T/21T: 1.905:1 GEAR
- 38T/20T: 1.900:1 (stock)
- 39T/21T: 1.857:1 GEAR
- 37T/20T: 1.850:1
- 40T/22T: 1.818:1 GEAR
- 38T/21T: 1.810:1
- 39T/22T: 1.772:1 GEAR
- 37T/21T: 1.762:1
- 28T/22T: 1.727:1
- 27T/22T: 1.681:1
I made a simple FDR calculator sheet in Excel similar to the one we used for VTA racing for all of the Sakura internal ratios and pulley options. input your spur and pinion combo and it will calculate the FDR for you. No frills, but it will find an optimal FDR if you are looking for a specific ratio.
doug
*GEAR marks ratios only available with the new 39T or 40T gear diff pulleys. Not available for ball or roller diffs.
Last edited by squarehead; 12-09-2010 at 07:39 PM.
12-09-2010, 03:51 PM
#113
Tech Rookie
iTrader: (1)
I plan on just running in large parking lots with the stock car to start off with.
I'm planning to use a Tacon motor from hobbypartz since its a low cost motor. What KV rating should I use on this car for my use? Also what FDR should I shoot for? I will also be buying a range of pinion gears and spur gears for future use.
Thank you for the Excel spread sheet squarehead. It will come in handy.
I'm planning to use a Tacon motor from hobbypartz since its a low cost motor. What KV rating should I use on this car for my use? Also what FDR should I shoot for? I will also be buying a range of pinion gears and spur gears for future use.
Thank you for the Excel spread sheet squarehead. It will come in handy.
12-09-2010, 05:07 PM
#115
Just so you guys don't have to do the math, with the various diff and layshaft pulleys available, you can get a bunch of different internal ratios with this car. I would guess some of the larger layshaft pulleys won't work because of the belt lengths, but that's a guess.
I have not tried them all, so I don't know if these belts will handle all of them, but here are the internal ratios for all of the pulleys:
I made a simple FDR calculator sheet in Excel similar to the one we used for VTA racing for all of the Sakura internal ratios and pulley options. input your spur and pinion combo and it will calculate the FDR for you. No frills, but it will find an optimal FDR if you are looking for a specific ratio.
doug
I have not tried them all, so I don't know if these belts will handle all of them, but here are the internal ratios for all of the pulleys:
- 38T/19T: 2.000:1
- 37T/19T: 1.947:1
- 38T/20T: 1.900:1 (stock)
- 37T/20T: 1.850:1
- 38T/21T: 1.810:1
- 37T/21T: 1.762:1
- 28T/22T: 1.727:1
- 27T/22T: 1.681:1
I made a simple FDR calculator sheet in Excel similar to the one we used for VTA racing for all of the Sakura internal ratios and pulley options. input your spur and pinion combo and it will calculate the FDR for you. No frills, but it will find an optimal FDR if you are looking for a specific ratio.
doug
12-09-2010, 06:14 PM
#117
Squarehead thanks for the FDR sheet. 
12-09-2010, 10:50 PM
#119
Tech Rookie
-Bloody kiss~ two really good looking guys XDD
-vampire knight?
-not sure if higurashi will fit in this but it has really cute characters (but its a psychological/horror anime?? kinda like school days lol)
-kimi kiss
-fruit basket (manga is way better)
-loveless
damn.. i have some more but those were the only ones on the top of my head XDD
try looking them up on mangafox and onemanga.com ^
-vampire knight?
-not sure if higurashi will fit in this but it has really cute characters (but its a psychological/horror anime?? kinda like school days lol)
-kimi kiss
-fruit basket (manga is way better)
-loveless
damn.. i have some more but those were the only ones on the top of my head XDD
try looking them up on mangafox and onemanga.com ^
12-10-2010, 12:03 AM
#120
What batteries do they currentley run in mod?
It used to be 4cell (nimh) for TC which was unheard of in the rest of the world.
Do they run lipo or life f.e.?
Just curious.
I know 23t also used to be huge. But I really do not know what the switch Li-batt and BL did to the Asian rc racing world....