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Old 05-28-2015, 04:00 AM   #3346
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Hi all

new to forum and newer to RC touring cars anyhow I've just purchased a TD10 and a Trackstar 10.5 (3250kv) to fool around with. Have also purchased the 19t center pully as is recommended by a lot of people online.

My guestion is what would a suitable pinion be for the kits stock gearing apart from the 19t pully with the 10.5 motor?

I was thinking a 28 or 29 pinion?

Last edited by icair; 05-28-2015 at 04:06 AM. Reason: spelling
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Old 05-28-2015, 07:35 AM   #3347
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That is fine. It will bring your car down to about a 5.5 FDR, if using the 29 pinion and 19t pulley with stock spur gear (80t).

If you were racing, I'd recommend you get to a 4.5 fdr. But 5.5 will ensure that nothing fails.
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Old 05-28-2015, 02:39 PM   #3348
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Thanks!
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Old 06-11-2015, 12:05 AM   #3349
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just bought the sakura zero s kit. I have not built it yet. I've been going through the pages for a few days now.

it sounds like that a stock spur and 38t pinion will give me close to 4.0 fdr but will a 38t pinion fit without any problems? I have a 17.5 motor.

thanks
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Old 06-11-2015, 12:08 AM   #3350
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also, do i need to buy a 19t center pully? thanks
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Old 06-11-2015, 08:20 AM   #3351
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Yes, a 19t pulley is recommended. The stock pulley on the Xi is a much cheaper option than going with the aluminum pulleys. Without the smaller pulley, you will find that the front drive belt iis very tight.
The vertical motor mount will alllow you to easily change gearing. You may also want to get a smaller spur gear, so that you don't have to buy a 38t 48p pinion (which is very large).
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Old 06-11-2015, 01:02 PM   #3352
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Yes, a 19t pulley is recommended. The stock pulley on the Xi is a much cheaper option than going with the aluminum pulleys. Without the smaller pulley, you will find that the front drive belt iis very tight.
The vertical motor mount will alllow you to easily change gearing. You may also want to get a smaller spur gear, so that you don't have to buy a 38t 48p pinion (which is very large).
part of the reason why I bought the kit was it's cheap. can the car still run with a tight belt? I mean as time goes on, a tight belt gets looser. can I just stretch the belt? I'm a newbie with this car.

it says on another website if I buy the vertical mount that I need a graphite piece on top.

so will the 38t pinion fit? appreciate the help.
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Old 06-23-2015, 12:47 PM   #3353
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anyone have advice to keep this car going straight? I've tried a lot of things already and even bought a new servo.
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Old 06-23-2015, 04:46 PM   #3354
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anyone have advice to keep this car going straight? I've tried a lot of things already and even bought a new servo.
Assuming that you mean the steering won't stay centered:

Step 1- Make sure that the steering is free by disconnecting the link to the servo.

Step 2- Most people replace the kit servo saver with an aftermarket one. The problem with the kit one is actually that the "cap" that holds it all together is slightly too short, so that when you tighten the screw it pinches all the parts together. Then if you bump a wall, the output part of the servo saver moves a little and doesn't spring back to center. A simple fix to this is to put the screw through the "cap", then put a 0.020" thick motor shim on the screw between the cap and the rest of the servo saver. This removes the "pinch" and allows the servo saver's springs to work properly.
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Old 06-23-2015, 10:10 PM   #3355
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Assuming that you mean the steering won't stay centered:

Step 1- Make sure that the steering is free by disconnecting the link to the servo.

Step 2- Most people replace the kit servo saver with an aftermarket one. The problem with the kit one is actually that the "cap" that holds it all together is slightly too short, so that when you tighten the screw it pinches all the parts together. Then if you bump a wall, the output part of the servo saver moves a little and doesn't spring back to center. A simple fix to this is to put the screw through the "cap", then put a 0.020" thick motor shim on the screw between the cap and the rest of the servo saver. This removes the "pinch" and allows the servo saver's springs to work properly.
thank you kevin. I appreciate your reply. I made sure step 1 was checked. I have a feeling it might be the servo saver.
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Old 06-24-2015, 07:43 AM   #3356
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Give yourself some front toe-out also. This will straighten out the car.
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Old 06-24-2015, 08:19 AM   #3357
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Give yourself some front toe-out also. This will straighten out the car.
I thought front-out will give more car turning and less car straight? I need more stabilization of straight line driving.
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Old 06-28-2015, 11:27 PM   #3358
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just wondering if anyone has changed all the main parts to graphite (shock tower, main chassis, etc)? if so, was the performance better because it was lighter?
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Old 06-28-2015, 11:33 PM   #3359
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buy a new servo saver
stock one is crap...nothing but problems
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Old 06-29-2015, 09:11 AM   #3360
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just wondering if anyone has changed all the main parts to graphite (shock tower, main chassis, etc)? if so, was the performance better because it was lighter?
I have few of these chassis and I'm more less a new driver and don't really notice the difference. But have fun finding cf chassis
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