Tekin T8 1700kv truggy motor power delivery

[wallot]

Ok, will put it here as this is much more quiet forum without tons of posts a day



I feel a "hole" when going from low to mid RPMs.

Acceleration from standstill is great, topend is great but at the beginning of corner exit I feel a lack of power for a bit before the motor goes balistic

I played with Throttle profiles on RX8 and EXPonential on my radio but either I can feel the hole or too much power making it very hard to control the corner exit.

This is how it feels:





MBX5-T on BCE chassis with MBX6 shocks
RCM Slipperential
46/15 gearing (37.1mph) or 46/14 (34.7mph)
1700kv truggy motor
5S Lipo either 5000 Zippy Flightmax 30C or Hyperion G3 3300mah 35C/65C depending on weight and runtime I need
RTR weight 4280grams with Hyperion 4480grams with Zippy
Proline VTR tires


No drag brake
Brushless fwd/Brk mode
5S LVC
Current limiter off
Default neutral width
Tried Throttle profiles 3,4 and 5
Timing default 10

With Neu 1415/2.5D 1700kv the power delivery is linear

[nitrostarter]

You are running the RX8 esc correct? And did you run the Neu 1415/2.5D on the RX8 or a different ESC?

Seems like a throttle signal problem or throttle profile problem...

[wallot]

Both with RX8. Other people have the same problem with RX8 + T8 motor combo

Same setting different motors. Neu works, Tekin does not. Well it works great of course but not with the linear power delivery and since i am very smooth on the throttle i can feel it.

[hootie7159]

i had the same problem when i had it in my rc8t....then the esc died and i ended up sending BOTH back to tekin to get the esc fixed and get the updated rotor fix....when i put the combo back it i actually had to gear it 2 teeth down ....(originally had it 17/46 to make up for the initial "pop")...not sure what they did to the esc or motor but it no longer has that "lag" in the initial throttle input...IDK...just my 2cents....

[wallot]

the lag is not in the initial input. it is when going from lets say 5000rpm to 8000rpm or something like that. I can feel it when exiting corner that the motor takes a bit more time to spool up.
Motor has then rotor.

Guess i will have to try it without the sensor wire.

[SpEEdyBL]

If you don't already know, the Tekin T8 1700kv Truggy motor is a 1.5Y wind. Y winds respond to timing changes very well unlike D winds. Tekin originally sold the esc's preset with pretty high timing - making the Y winds rip more, and switched low timing on their later escs.

[RC-Monster Mike]

The 1700Kv Tekin Truggy motor is delta wound(2.5d - same as the similar 1515 Neu). Not as responsive to timing like a Y wound motor. This issue sounds more like a throttle profile or punch setting than timing to me (or dislocated rotor) - a dislocated rotor would make it feel like it has no "pop" coming out of corners or when trying to get over a jump with short run-up. The low end would be similarly affected, though. The sensor wire shouldn't be a factor at all.
For linear feel, the throttle profile "3" should be used, along with "0" on the throttle exponential. "4" and "5" throttle profiles should be rather aggressive/difficult regarding low-speed control(twitchy), and "numb" when beyond 50% trigger movement.

[wallot]

the pop is missing only when coming out of corners. from standstill it works well.

how can punch control help with this?

[RC-Monster Mike]

Disabling punch control (called current limiter in the Tekin software)would maximize corner exit "punch". I find that current limiting, while effective when taking off from a standstill, creates a "numb" or "muddy" throttle feeling in the mid range as you describe. The effect should be the same with a Neu motor as it is with a Tekin motor - this is where your stated issue gets wierd. The motors are dumb - only do what they are told by the esc.

[wallot]

I have punch control off.
exactly, it is weird, however couple fellow racers have the same feel - both run rx8 with 1700k T8 on 5S

[RC-Monster Mike]

Hmm. I run the same combo in my truggy (1700Kv truggy combo on 5s). I have never tried using another motor, but never noticed any "dead spots" in the powerband (I use throttle profile #2 and "95" CL setting).

[wallot]

will try that. I wish I had more time for playing with ESC settings.

[TekinTeamMgr]

Can you post your esc setup on here? Do you have a hotwire? If so what software are you running?

What Radio? Battery,etc?

[wallot]

Radio - DX3R
Battery - Hyperion G3 3300mah 5S 35C/65C or Zippy Flightmaxx 5000mah 30C/40C
I do have hotwire

RX8 settings:

No drag brake
Brushless fwd/Brk mode or FWD/BRK/Delayed Reverse
5S LVC
Current limiter off
Default neutral width
Tried Throttle profiles 3,4 and 5
Timing default 10

See my first post with the remaining info about my truck.
I use hotwire V3.25 -
i started with 3.24Beta that updated my ESC to fw198.
V3.25 after start displays a warning that some values are out of expected range.

[RC-Monster Mike]

5s 3300mah pack in a truggy will be pushed pretty hard on acceleration - this could very well be part of the problem(I would expect the same issue when using the Neu motor). I haven't used the Zippy packs, but would expect them to drop a bit under hard acceleration as well.