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Old 11-15-2016, 09:15 AM   #1
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Default 17.5 Motor Std or Short Stack 1S?

OK for touring car in some previous threads in discussion on what motor to get and all that. I noticed guys mention a 1S version or Short Stack.


I am running touring car and unless there was so many guys discussing running 1/12, do people put in 1S version motors in the touring car blinky 17.5?


Is 1S just a short stack that is an RPM stator?


OK the track is medium size layout some technical sections from week to week. Straightaway is like 60 feet.
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Old 11-15-2016, 09:50 AM   #2
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I believe they are both 12.5 rotors and like you mentioned the Stator is short for more rpm. I run a 24k 17.5 Trinity in blinky with my Bd7 and I actually run a Trinity D4 1S in my 2WD buggy even.. I feel they can both work for your app but it all comes down to gearing and timing.

Go up .1-.2 On the final drive to start off with the same timing and tweak from there imo.
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Old 11-15-2016, 12:36 PM   #3
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What a large number of people are doing is running a high torque rotor with an RPM (1s or short stack) stator.

Seems to be the ticket for most 17.5 TC applications.
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Old 11-15-2016, 02:54 PM   #4
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Yeah interesting. Thanks.


I have Fantom FR-1 Works Edition original release from last winter with Torque Stator and highest range torque rotor. Although I am waiting on a 96T spur and pinions to get the FDR tuning available to me as I am at 102/46 with an FDR 4.43 of on the BD7.


Just getting blown away per lap as I am 1 second down and this car is getting around the track in terms of feel way better than the TRF419 so it is faster and there is still maybe springs tuning or I still have the Aluminum chassis too to try for the carpet.


I will play with the timing, but wondered about the motors out there.
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Old 11-15-2016, 03:34 PM   #5
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When you get to 3.9fdr you will blow them away.....
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Old 11-15-2016, 04:31 PM   #6
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Like Bert said, once you are in the 3.8-4.1 Fdr..the car is moving out. With the sweet spot on timing as well you will be impressed. I race mod aswell with my 17.5 car on a med size carpet track and do well in both.
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Old 11-15-2016, 04:43 PM   #7
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I'll put the FR-1 on the Skyrc Motor Analyzer and check actual timing and see the amp draw like Nick Adams videos. ON the can it shows 46 deg, but we know they are not 100% accurate. That was the setting from Fantom telling them it was Touring Std track.
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Old 11-15-2016, 05:52 PM   #8
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Ok,


Put the Fantom on the Skyrc Motor Analyzer:


average timing is at 43 deg, it is 42, 43, 43 on each phase


in the kV test, after I cranked up the throttle on the Motor Analyzer:


kV = 2484
V = 8.2V
RPM = 20,375
I = 2.1 Amps


I guess crank up the timing to see 6 Amps on the tester?
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Old 11-15-2016, 06:02 PM   #9
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Nice the timing is pretty bang on. 45-48 timing should be around 6 and is a common place to make power and not dummy the average battery pack.
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Old 11-15-2016, 06:26 PM   #10
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Okay I cranked it up a little bit by bit:


average timing is at 51 deg, it is 50, 50, 52 on each phase

kV = 3153
V = 8.0V
RPM = 25,231
I = 6.4 Amps
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Old 11-15-2016, 07:45 PM   #11
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Quote:
Originally Posted by 190mph View Post
Okay I cranked it up a little bit by bit:


average timing is at 51 deg, it is 50, 50, 52 on each phase

kV = 3153
V = 8.0V
RPM = 25,231
I = 6.4 Amps
There it is man, you have good power between 48-51 degrees of timing. Just gear that thing nice and you're gold.
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Old 11-15-2016, 08:56 PM   #12
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Quote:
Originally Posted by 190mph View Post
Okay I cranked it up a little bit by bit:


average timing is at 51 deg, it is 50, 50, 52 on each phase

kV = 3153
V = 8.0V
RPM = 25,231
I = 6.4 Amps
If you're running on a track with a 60ft straight, I'd gear it around 4.2. Watch your motor temps though now that you've added a bunch of timing.
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Old 11-16-2016, 03:00 PM   #13
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what kind of temps are yall looking for?? 150*+ or less
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Old 11-16-2016, 04:12 PM   #14
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Invest in a very good fan too.... I prefer 50 degrees average timing as max timing, and around 48* to give a little gearing flexibility ....
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Old 11-18-2016, 07:45 AM   #15
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I have found a no load draw between 6 and 7 amps is a good place to start. Every motor is a little different but it seems to range from @ 46 to 53 actual degrees for the above amps.

Gear to lap times, and time over 5 minutes, get a good 30mm fan mounted between 8 and 10mm away from motor can and ideally wire fan to battery voltage.

Gearing to best times might take a few days of track time, but in 17.5 it can help a ton.
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