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Old 03-22-2010, 03:36 PM   #1
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Default Xray t1fk04 17.5 brushless gearing

Good day!

I am setting up an Xray t1fk04 for outdoor stock touring. I am going to install a 17.5 brushless an was wondering what pinion/sper combo would be a good starting point? The track I will be racing on is pictured below but the layout changes every weekend. Also I have aquiered a 2mm swaybar with the 2 ball arms but I can't see how it would mount to the bulheads, may be missing parts? Any info would be great!

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Old 03-23-2010, 12:20 AM   #2
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Check here http://www.rctech.net/forum/electric...4-xray-t1.html for a wealth of good info on the FK04. Gearing is becoming more dependent on speedo/motor combination, so check the relevant thread for whatever you are using for the best advice in that area. That 2mm sway bar will be great for digging tire grime and traction compound out from under your fingernails, but you more than likely won't need it on the car for big track asphalt racing. Also, you will need to dremel the motor cutout in the chassis for the brushless motor to fit, there are some pics in the last few pages of the T1 thread. It's a great car, rotates well, and is a tank compared to the modern crop of TC's with their frail little steering knuckles and tiny bearings...good luck with it!

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Old 03-23-2010, 03:31 PM   #3
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Thanks for the reply.

I started there and did several serches and read many pages and still could not find a starting point for gearing a 17.5 brushless. There is lots of info for 27 and 19 turn but none for brushless. I will post this request there and see what happens.

Thanks.

I decided to not post in the other thread as it would only bring up a 2nd thread to the top with the same question.
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Old 03-23-2010, 05:20 PM   #4
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Quote:
Originally Posted by BCbud View Post
Thanks for the reply.

I started there and did several serches and read many pages and still could not find a starting point for gearing a 17.5 brushless. There is lots of info for 27 and 19 turn but none for brushless. I will post this request there and see what happens.

Thanks.

I decided to not post in the other thread as it would only bring up a 2nd thread to the top with the same question.
Problem is that few have even run a brushless in this car as there was no such thing when this car was on top. I did fit in a brushless system in one of my EVOII cars but did'nt have any time to really run it or figure out what was a good gearing. Plus with todays new esc's whatever I might have come up with would'nt be right now. Best I can suggest is to start with an FDR of 4.5 and check temps. If you are using an advanced timeing esc try with little or no boost at first and get more aggressive as temps allow.
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Old 03-23-2010, 09:39 PM   #5
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Spur and pinion combo is going to be determined by your motor/ESC combination and the layout. If I recall correctly, that car used exceptionally large spurs (120 - 128 teeth) in most cases; you'll probably want to find a few that are a bit smaller (100 - 108 teeth) to accomodate a brushless motor comfortably. Using a smaller spur should allow you to use a pinion in the 36-46 tooth range, which should meet your needs without having to braeak out the Dremel to make things fit.

Another thing that might make life a little easier would be a low ratio pulley set for the T1; this would change the internal drive ratio from 2.125 to 1.77, which would allow you the ability to use slightly larger spur gears if you wish.
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Old 03-23-2010, 11:03 PM   #6
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Quote:
Originally Posted by oeoeo327 View Post
Spur and pinion combo is going to be determined by your motor/ESC combination and the layout. If I recall correctly, that car used exceptionally large spurs (120 - 128 teeth) in most cases; you'll probably want to find a few that are a bit smaller (100 - 108 teeth) to accomodate a brushless motor comfortably. Using a smaller spur should allow you to use a pinion in the 36-46 tooth range, which should meet your needs without having to braeak out the Dremel to make things fit.

Another thing that might make life a little easier would be a low ratio pulley set for the T1; this would change the internal drive ratio from 2.125 to 1.77, which would allow you the ability to use slightly larger spur gears if you wish.
With a spur that small the rear belt will rub the motor, and unfortunately, I haven't found a BL motor yet with a can shape that will fit without enlarging the chassis cutout. Also, the FK04 came standard with the low ratio pulleys, you should be good to go.
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Old 05-01-2010, 07:31 PM   #7
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Good day!

I will be posting my results in the T1FK04 thread. I will also have pics of how I put in a fan for the motor.
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