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Old 12-31-2014, 08:21 AM   #481
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Gary had his motor checker at Club practice last night and offered to check my two 21.5t trackstar motors. With the timing maxed on both, average timing was 37degrees. Varience between the highest and lowest fields was 6 degrees on one and 4 degrees on the other.
When I got home, I dismantled the worse of the two and modified it for infinite timing adjustment and inspected the hall effect sensors on the sensor board and it looks like one of the sensors isn't centered quite well on the solder pads. I'll try to reposition it.
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Old 12-31-2014, 08:34 AM   #482
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Gary had his motor checker at Club practice last night and offered to check my two 21.5t trackstar motors. With the timing maxed on both, average timing was 37degrees. Varience between the highest and lowest fields was 6 degrees on one and 4 degrees on the other.
When I got home, I dismantled the worse of the two and modified it for infinite timing adjustment and inspected the hall effect sensors on the sensor board and it looks like one of the sensors isn't centered quite well on the solder pads. I'll try to reposition it.
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Old 12-31-2014, 09:23 AM   #483
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Wtf? The Hobbyking X-Car 17.5T have 500kv less than the Trackstar?
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Old 12-31-2014, 09:47 AM   #484
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I have a Trackstar 17.5 in my buggy and a 13.5 in my tourer, pleased with their performance but I find they both run hot. Finish a 6m buggy run on a warm day and the temp is around 75c with stock timing. If I switch it to my Speed Passion 17.5 and do the next race the temp is around 55-60c (stock timing as well). 2wd rear mount buggy so there is no way to mount a heatsink or a fan..
Stock timing on the speed passion is only 10*, so that's not at all surprising if you didn't adjust the gearing.
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Old 12-31-2014, 10:45 AM   #485
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All I needed was side cutters and a file. Hehe. The lathe would have worked better but I didn't want to drive to the shop at midnight.

So, does increasing timing increase the power everywhere, or just in the higher rpm's?
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Old 12-31-2014, 10:52 AM   #486
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Increases top end at the sacrifice of low end torque.
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Old 12-31-2014, 11:39 AM   #487
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Take note, I have put the 21.5 and the 17.4 on the Fantom Dyno with a sensor board that allowed more timing. It was not needed. If you go pass the + the bottom end torque begins to drop and the amp draw rockets resulting in a big loss in efficiency. Turnigy had it right with their sensor board. You might just want to drop the timing to the last line and gear to heat.
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Old 12-31-2014, 01:00 PM   #488
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I have found the best performance on these at the last timing mark. i have tried it one mark back and it was not much difference. but these are great motors for the money. I may check my sensor boards for alignment and thats about it.
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Old 01-01-2015, 04:13 PM   #489
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Playing with timing on my 21.5 trackstar motor. Seems to work best at 50 degrees. Tried 55 and it was no faster and made more heat. Running at 50 degrees allowed me to go 2 teeth smaller on the pinion. The car is MUCH faster now than at the stock max of 37 degrees. Picked up a couple of tenths on our little 6 second track.
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Old 01-02-2015, 12:21 PM   #490
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Playing with timing on my 21.5 trackstar motor. Seems to work best at 50 degrees. Tried 55 and it was no faster and made more heat. Running at 50 degrees allowed me to go 2 teeth smaller on the pinion. The car is MUCH faster now than at the stock max of 37 degrees. Picked up a couple of tenths on our little 6 second track.
Can you take a picture of the back of the motor can, showing where the timing is adjusted to? I wouldn't mind trying this out. How much more heat did the motor generate? And amp draw?
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Old 01-02-2015, 12:37 PM   #491
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Can you take a picture of the back of the motor can, showing where the timing is adjusted to? I wouldn't mind trying this out. How much more heat did the motor generate? And amp draw?
The motor got about 20 degrees hotter, but was still coming off the track at 121deg after 5 minutes. I'm running an R1 fan with a shroud which helps a lot.
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Old 01-02-2015, 02:24 PM   #492
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Old 01-02-2015, 03:59 PM   #493
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The motor got about 20 degrees hotter, but was still coming off the track at 121deg after 5 minutes. I'm running an R1 fan with a shroud which helps a lot.
How did you know that was 50* and how did you pass the last mark?
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Old 01-02-2015, 04:31 PM   #494
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you have to pull the sensor in the back and trim the tabs so it can rotate more.
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Old 01-02-2015, 04:36 PM   #495
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How did you know that was 50* and how did you pass the last mark?
I ran the car a bunch of times with the motor timing in different positions. Once I was happy with the power and temp, Gary put it on his motor checker which revealed the timing to be 50 degrees. I ran the motor at ~55 but it didn't get any faster but ran hotter, so I figured that 50 degrees was a good place to leave it.
If you take the motor apart, you'll see that there are three tabs that limit how far you can adjust the timing. Removing the tabs will allow infinite timing adjustment.
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