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Old 07-09-2014, 03:34 PM   #421
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Default 64 pitch

Quick question, I am new to brushless motors and was wondering if the following is true:
(Quoted from a hobby shop staffer):

"If you are running 17.5 motor, you need to change the spur and pinion to 64pitch. 48pitch is too big to make the right gearing.

64pitch 96t spur and 64pitch 48t pinion will give you the gearing at 4.00, which is good to start.

Internal gear ration of XI is 2.0

96 / 48 * 2 = 4.00 (Spur size / pinion size * internal gear ratio)"


Is this true ? And will the 64 pitch set up work with the car with pulley system, etc?

What motor size was the 48 pitch gearing set up for?

Thanks for your help. I am switching from Tamiya items and am not used to so many choices. Best
W
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Old 07-09-2014, 08:35 PM   #422
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Quote:
Originally Posted by Willis99 View Post
Quick question, I am new to brushless motors and was wondering if the following is true:
(Quoted from a hobby shop staffer):

"If you are running 17.5 motor, you need to change the spur and pinion to 64pitch. 48pitch is too big to make the right gearing.

64pitch 96t spur and 64pitch 48t pinion will give you the gearing at 4.00, which is good to start.

Internal gear ration of XI is 2.0

96 / 48 * 2 = 4.00 (Spur size / pinion size * internal gear ratio)"


Is this true ? And will the 64 pitch set up work with the car with pulley system, etc?

What motor size was the 48 pitch gearing set up for?

W
Hey bud,

Yes this is true, I too would personally recommend you use 64 pitch gears as it's easier to achieve the specific gear ratio's some of us are after. The advice you were given is correct, and yes the gears will fit. You can buy them directly from 3racing which are guaranteed to fit.

The stock spur gear can be used for various different motors, I'd say the lowest gear ratio you could achieve would be 5.3 FDR , which can be used for boosted classes ect.

Here's everything you should need

http://os.3racing.hk/products.php?products_key=4511
http://os.3racing.hk/products.php?products_key=4555
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Old 07-10-2014, 09:08 AM   #423
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Thanks Billy, appreciate the reply and advice, I am looking forward to putting the kit together in a couple of weeks, I'll grab the parts from a source in the USA. What a kind forum!

Sas Efxharisto!
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Old 07-10-2014, 03:12 PM   #424
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Quote:
Originally Posted by Willis99 View Post
Quick question, I am new to brushless motors and was wondering if the following is true:
(Quoted from a hobby shop staffer):

"If you are running 17.5 motor, you need to change the spur and pinion to 64pitch. 48pitch is too big to make the right gearing.

64pitch 96t spur and 64pitch 48t pinion will give you the gearing at 4.00, which is good to start.

Internal gear ration of XI is 2.0

96 / 48 * 2 = 4.00 (Spur size / pinion size * internal gear ratio)"


Is this true ? And will the 64 pitch set up work with the car with pulley system, etc?

What motor size was the 48 pitch gearing set up for?

Thanks for your help. I am switching from Tamiya items and am not used to so many choices. Best
W
Well, it's mostly true. You do NOT need to use 64 pitch to get the correct gear ratio. Several companies (3racing, Integy, Robinson) make 48 pitch pinions with up to 41 teeth (Robinson goes to 47T but it's hard to get it installed in most cars). Spur gears are available with 60 or 55T, so getting a 4:1 FDR is no problem.

64 pitch gives you finer adjustments, but they are more fragile. If you're racing outdoors, 48 pitch might be a better choice.
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Old 07-20-2014, 09:43 PM   #425
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Just wondering if the zero s sway bars and kit will fit on xi sport? I cant seem to find a definite answer about this. Thanks in advance..

I have the xi sport with a thunder power 21.5 and high torque rotor. 64 pitch geared to 3.25. Stock kit except for aluminum bulkheads and aluminum steering setup. It runs right up there with the high dollar cars.

Anyway thanks
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Old 07-20-2014, 09:55 PM   #426
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Quote:
Originally Posted by ttsquirrel View Post
Just wondering if the zero s sway bars and kit will fit on xi sport? I cant seem to find a definite answer about this. Thanks in advance..

I have the xi sport with a thunder power 21.5 and high torque rotor. 64 pitch geared to 3.25. Stock kit except for aluminum bulkheads and aluminum steering setup. It runs right up there with the high dollar cars.

Anyway thanks
Unfortunately the Sakura Zero swaybars themselves will not fit in the XI sport or Ultimate chassis. You'll have to buy the upgraded kit, where the swaybars are the same front and rear:

http://os.3racing.hk/products.php?products_key=6586

Here I've found the bars, but I couldn't find the mounts
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Old 07-20-2014, 10:48 PM   #427
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Quote:
Originally Posted by ttsquirrel View Post
Just wondering if the zero s sway bars and kit will fit on xi sport? I cant seem to find a definite answer about this. Thanks in advance..

I have the xi sport with a thunder power 21.5 and high torque rotor. 64 pitch geared to 3.25. Stock kit except for aluminum bulkheads and aluminum steering setup. It runs right up there with the high dollar cars.

Anyway thanks
According too TQ RC Racing these sway bars are compatible, and reasonably priced.

http://www.tqrcracing.com/shop/produ....asp?p_id=6516
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Old 07-21-2014, 09:06 AM   #428
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This last weekend race I had a big problem with traction roll. Someone l told me raise the inner roll center. How do I do that?

Another person said to put on sway bars hence my previous posts. I can't find part sak-u317 in stock at tqracing. Where else can I go in US to find this part? I dont want to wait for part from HK or china.

Thanks

TTS
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Old 07-21-2014, 09:50 AM   #429
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Quote:
Originally Posted by ttsquirrel View Post
This last weekend race I had a big problem with traction roll. Someone l told me raise the inner roll center. How do I do that?

Another person said to put on sway bars hence my previous posts. I can't find part sak-u317 in stock at tqracing. Where else can I go in US to find this part? I dont want to wait for part from HK or china.

Thanks

TTS
Here are some sources.

http://racevta.com/product_info.php?products_id=371

http://www.integy.com/st_prod.html?p...w#.U802VFavvHg
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Old 07-21-2014, 11:54 AM   #430
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THANKS!!!
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Old 07-22-2014, 02:40 AM   #431
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Quote:
Originally Posted by ttsquirrel View Post
This last weekend race I had a big problem with traction roll. Someone l told me raise the inner roll center. How do I do that?

Another person said to put on sway bars hence my previous posts. I can't find part sak-u317 in stock at tqracing. Where else can I go in US to find this part? I dont want to wait for part from HK or china.

Thanks

TTS
Sway Bars are very important for good even grip.
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Old 07-22-2014, 12:38 PM   #432
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It was rather humorous to watch your flips on almost every corner. I run sway bars on the front and have no issue… except breaking!
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Old 07-22-2014, 07:34 PM   #433
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It was rather humorous to watch your flips on almost every corner. I run sway bars on the front and have no issue… except breaking!
I found no humor in that...not only will I put on sway bars but I will raise roll center.
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Old 07-25-2014, 01:34 AM   #434
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What's the difference between "SAK-59/V2/PK Front One Way - Ver. 2" and SAK-U315/PK Front One Way?
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Old 08-01-2014, 06:18 AM   #435
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Hi all, I'm new to RC and have just brought the XI Sport. I know next to nothing about gear ratios and need some help in selecting a pinion gear. The motor I will be putting in is a sensorless HPI Vector 5900KV brushless running 2C lipos. No plans on racing at this stage, just running around netball courts and getting used to driving in general. Also if anyone could point me in the right direction for some info on gear ratios,that would be great.
BTW the motor is out of a HPI Sprint 2 which had a pinion of 23/48pitch and spur of 90/48pitch and the motor only got warm after running.
Thanks in advance.
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